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New York Regents Chemistry June 2007

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PS/CHEMISTRY The University of the State of New York REGENTS HIGH SCHOOL EXAMINATION PHYSICAL SETTING CHEMISTRY Wednesday, June 20, 2007 1:15 to 4:15 p.m., only This is a test of your knowledge of chemistry. Use that knowledge to answer all questions in this examination. Some questions may require the use of the Reference Tables for Physical Setting/Chemistry. You are to answer all questions in all parts of this examination according to the directions provided in the examination booklet. Your answer sheet for Part A and Part B 1 is the last page of this examination booklet. Turn to the last page and fold it along the perforations. Then, slowly and carefully, tear off your answer sheet and fill in the heading. The answers to the questions in Part B 2 and Part C are to be written in your separate answer booklet. Be sure to fill in the heading on the front of your answer booklet. Record the number of your choice for each Part A and Part B 1 multiple-choice question on your separate answer sheet. Write your answers to the Part B 2 and Part C questions in your answer booklet. All work should be written in pen, except for graphs and drawings, which should be done in pencil. You may use scrap paper to work out the answers to the questions, but be sure to record all your answers on your separate answer sheet and in your answer booklet. When you have completed the examination, you must sign the statement printed at the end of your separate answer sheet, indicating that you had no unlawful knowledge of the questions or answers prior to the examination and that you have neither given nor received assistance in answering any of the questions during the examination. Your answer sheet and answer booklet cannot be accepted if you fail to sign this declaration. Notice. . . A four-function or scientific calculator and a copy of the Reference Tables for Physical Setting/Chemistry must be available for you to use while taking this examination. The use of any communications device is strictly prohibited when taking this examination. If you use any communications device, no matter how briefly, your examination will be invalidated and no score will be calculated for you. DO NOT OPEN THIS EXAMINATION BOOKLET UNTIL THE SIGNAL IS GIVEN. PS/CHEMISTRY Part A Answer all questions in this part. Directions (1 30): For each statement or question, write on the separate answer sheet the number of the word or expression that, of those given, best completes the statement or answers the question. Some questions may require the use of the Reference Tables for Physical Setting/Chemistry. 1 According to the wave-mechanical model of the atom, electrons in an atom (1) travel in defined circles (2) are most likely found in an excited state (3) have a positive charge (4) are located in orbitals outside the nucleus 6 Which element is most chemically similar to chlorine? (1) Ar (3) Fr (2) F (4) S 7 Which substance can be decomposed by chemical means? (1) ammonia (3) phosphorus (2) oxygen (4) silicon 2 What is the total charge of the nucleus of a carbon atom? (1) 6 (3) +6 (2) 0 (4) +12 8 When an atom loses one or more electrons, this atom becomes a (1) positive ion with a radius smaller than the radius of this atom (2) positive ion with a radius larger than the radius of this atom (3) negative ion with a radius smaller than the radius of this atom (4) negative ion with a radius larger than the radius of this atom 3 A sample composed only of atoms having the same atomic number is classified as (1) a compound (3) an element (2) a solution (4) an isomer 4 Which two particles each have a mass approximately equal to one atomic mass unit? (1) electron and neutron (2) electron and positron (3) proton and electron (4) proton and neutron 9 What is the name of the polyatomic ion in the compound Na2O2? (1) hydroxide (3) oxide (2) oxalate (4) peroxide 5 Which two characteristics are associated with metals? (1) low first ionization energy and low electronegativity (2) low first ionization energy and high electronegativity (3) high first ionization energy and low electronegativity (4) high first ionization energy and high electronegativity P.S./Chem. June 07 10 Given the balanced equation: I + I I2 Which statement describes the process represented by this equation? (1) (2) (3) (4) [2] A bond is formed as energy is absorbed. A bond is formed and energy is released. A bond is broken as energy is absorbed. A bond is broken and energy is released. 11 An oxygen molecule contains a double bond because the two atoms of oxygen share a total of (1) 1 electron (3) 3 electrons (2) 2 electrons (4) 4 electrons 17 For a given reaction, adding a catalyst increases the rate of the reaction by (1) providing an alternate reaction pathway that has a higher activation energy (2) providing an alternate reaction pathway that has a lower activation energy (3) using the same reaction pathway and increasing the activation energy (4) using the same reaction pathway and decreasing the activation energy 12 Which term is defined as a measure of the average kinetic energy of the particles in a sample? (1) temperature (3) thermal energy (2) pressure (4) chemical energy 13 A 3.0 M HCl(aq) solution contains a total of (1) 3.0 grams of HCl per liter of water (2) 3.0 grams of HCl per mole of solution (3) 3.0 moles of HCl per liter of solution (4) 3.0 moles of HCl per mole of water 18 Which reaction releases the greatest amount of energy per 2 moles of product? (1) 2CO(g) + O2(g) 2CO2(g) (2) 4Al(s) + 3O2(g) 2Al2O3(s) (3) 2H2(g) + O2(g) 2H2O(g) 14 A dilute, aqueous potassium nitrate solution is best classified as a (1) homogeneous compound (2) homogeneous mixture (3) heterogeneous compound (4) heterogeneous mixture (4) N2(g) + 3H2(g) 2NH3(g) 19 What is the total number of carbon atoms in a molecule of ethanoic acid? (1) 1 (3) 3 (2) 2 (4) 4 15 Given the equation representing a phase change at equilibrium: C2H5OH( ) 20 Given the formulas for two compounds: H H Which statement is true? (1) The forward process proceeds faster than the reverse process. (2) The reverse process proceeds faster than the forward process. (3) The forward and reverse processes proceed at the same rate. (4) The forward and reverse processes both stop. H H C C O C C H H H H and H H H H C C C C OH H H H H H These compounds differ in (1) gram-formula mass (2) molecular formula (3) percent composition by mass (4) physical properties at STP 16 A 5.0-gram sample of zinc and a 50.-milliliter sample of hydrochloric acid are used in a chemical reaction. Which combination of these samples has the fastest reaction rate? (1) a zinc strip and 1.0 M HCl(aq) (2) a zinc strip and 3.0 M HCl(aq) (3) zinc powder and 1.0 M HCl(aq) (4) zinc powder and 3.0 M HCl(aq) P.S./Chem. June 07 H H C2H5OH(g) 21 A double carbon-carbon bond is found in a molecule of (1) pentane (3) pentyne (2) pentene (4) pentanol [3] [OVER] 26 According to one acid-base theory, a water molecule acts as an acid when the water molecule (1) accepts an H+ (3) donates an H+ (2) accepts an OH (4) donates an OH 22 Which changes occur when Pt2+ is reduced? (1) The Pt2+ gains electrons and its oxidation number increases. (2) The Pt2+ gains electrons and its oxidation number decreases. (3) The Pt2+ loses electrons and its oxidation number increases. (4) The Pt2+ loses electrons and its oxidation number decreases. 27 Which list of radioisotopes contains an alpha emitter, a beta emitter, and a positron emitter? (1) C-14, N-16, P-32 (2) Cs-137, Fr-220, Tc-99 (3) Kr-85, Ne-19, Rn-222 (4) Pu-239, Th-232, U-238 23 Which balanced equation represents an oxidation-reduction reaction? (1) BaCl2 + Na2SO4 BaSO4 + 2NaCl 28 Which nuclear decay emission consists of energy, only? (1) alpha particle (3) gamma radiation (2) beta particle (4) positron (2) C + H2O CO + H2 (3) CaCO3 CaO + CO2 (4) Mg(OH)2 + 2HNO3 Mg(NO3)2 + 2H2O 24 Which energy conversion occurs during the operation of a voltaic cell? (1) Chemical energy is spontaneously converted to electrical energy. (2) Chemical energy is converted to electrical energy only when an external power source is provided. (3) Electrical energy is spontaneously converted to chemical energy. (4) Electrical energy is converted to chemical energy only when an external power source is provided. 29 Which balanced equation represents nuclear fusion? 1n + 235U 142Ba + 91Kr + 31n (1) 0 92 56 36 0 (2) 4 222 86Rn + 2He 1 3 4 (3) 6 3Li + 0 n 1H + 2He 3 4 1 (4) 2 1H + 1H 2He + 0n 30 The energy released by a nuclear reaction results primarily from the (1) breaking of bonds between atoms (2) formation of bonds between atoms (3) conversion of mass into energy (4) conversion of energy into mass 25 An Arrhenius base yields which ion as the only negative ion in an aqueous solution? (1) hydride ion (3) hydronium ion (2) hydrogen ion (4) hydroxide ion P.S./Chem. June 07 226 88Ra [4] Part B 1 Answer all questions in this part. Directions (31 50): For each statement or question, write on the separate answer sheet the number of the word or expression that, of those given, best completes the statement or answers the question. Some questions may require the use of the Reference Tables for Physical Setting/Chemistry. 31 Which electron configuration could represent a strontium atom in an excited state? (1) 2 8 18 7 1 (3) 2 8 18 8 1 (2) 2 8 18 7 3 (4) 2 8 18 8 2 37 Compared to an electron in the first electron shell of an atom, an electron in the third shell of the same atom has (1) less mass (3) more mass (2) less energy (4) more energy 32 Which grouping of circles, when considered in order from the top to the bottom, best represents the relative size of the atoms of Li, Na, K, and Rb, respectively? 38 Which pair consists of a molecular formula and its corresponding empirical formula? (1) C2H2 and CH3CH3 (3) P4O10 and P2O5 (2) C6H6 and C2H2 (4) SO2 and SO3 39 Which particle diagram represents a sample of one compound, only? Key (1) (2) (3) (4) = atom of one element = atom of a different element 33 What is the total number of neutrons in an atom of 57 26Fe? (1) 26 (2) 31 (3) 57 (4) 83 34 At STP, which element is brittle and not a conductor of electricity? (1) S (3) Na (2) K (4) Ar (1) (3) (2) (4) 35 What is the total number of electrons in a Mg2+ ion? (1) 10 (3) 14 (2) 12 (4) 24 36 Which formula represents lead(II) chromate? (3) Pb2CrO4 (1) PbCrO4 (2) Pb(CrO4)2 P.S./Chem. June 07 (4) Pb2(CrO4)3 [5] [OVER] 40 An atom in the ground state contains a total of 5 electrons, 5 protons, and 5 neutrons. Which Lewis electron-dot diagram represents this atom? X X X X (1) (2) (3) 46 The organic compound represented by the condensed structural formula CH3CH2CH2CHO is classified as an (1) alcohol (3) ester (2) aldehyde (4) ether (4) 47 Given the balanced ionic equation representing a reaction: 2Al3+(aq) + 3Mg(s) 3Mg2+(aq) + 2Al(s) 41 At STP, fluorine is a gas and bromine is a liquid because, compared to fluorine, bromine has (1) stronger covalent bonds (2) stronger intermolecular forces (3) weaker covalent bonds (4) weaker intermolecular forces In this reaction, electrons are transferred from (1) Al to Mg2+ (2) Al3+ to Mg (2) HC2H3O2 and H3PO4 (3) KHCO3 and KHSO4 (4) NaSCN and Na2S2O3 49 Information related to a titration experiment is given in the balanced equation and table below. 43 At which Celsius temperature does lead change from a solid to a liquid? (1) 874 C (3) 328 C (2) 601 C (4) 0 C H2SO4(aq) + 2KOH(aq) K2SO4(aq) + 2H2O( ) Titration Experiment Results volume of H2SO4(aq) used 44 Given the equation representing a reaction at equilibrium: concentration of H2SO4(aq) ? 36.0 mL concentration of KOH(aq) 0.16 M Based on the equation and the titration results, what is the concentration of the H2SO4(aq)? (1) 0.12 M (3) 0.24 M (2) 0.16 M (4) 0.96 M decreasing the concentration of H2(g) decreasing the pressure increasing the concentration of N2(g) increasing the temperature 50 Which radioisotope is used in medicine to treat thyroid disorders? (1) cobalt-60 (3) phosphorus-32 (2) iodine-131 (4) uranium-238 45 Which compound is an unsaturated hydrocarbon? (1) hexanal (3) hexanoic acid (2) hexane (4) hexyne P.S./Chem. June 07 12.0 mL volume of KOH(aq) used 2NH3(g) + energy Which change causes the equilibrium to shift to the right? (1) (2) (3) (4) (4) Mg2+ to Al 48 Which two formulas represent Arrhenius acids? (1) CH3COOH and CH3CH2OH 42 The boiling point of a liquid is the temperature at which the vapor pressure of the liquid is equal to the pressure on the surface of the liquid. What is the boiling point of propanone if the pressure on its surface is 48 kilopascals? (1) 25 C (3) 35 C (2) 30. C (4) 40. C N2(g) + 3H2(g) (3) Mg to Al3+ [6] Part B 2 Answer all questions in this part. Directions (51 63): Record your answers in the spaces provided in your answer booklet. Some questions may require the use of the Reference Tables for Physical Setting/Chemistry. Base your answers to questions 51 through 53 on the information below. A gas sample is held at constant temperature in a closed system. The volume of the gas is changed, which causes the pressure of the gas to change. Volume and pressure data are shown in the table below. Volume and Pressure of a Gas Sample Volume (mL) Pressure (atm) 1200 0.5 600 1.0 300 2.0 150 4.0 100 6.0 51 On the grid in your answer booklet, mark an appropriate scale on the axis labeled Volume (mL). [1] 52 On the same grid, plot the data from the table. Circle and connect the points. [1] Example: 53 Based on your graph, what is the pressure of the gas when the volume of the gas is 200. milliliters? [1] 54 Explain, in terms of collision theory, why the rate of a chemical reaction increases with an increase in temperature. [1] 55 Determine the percent composition by mass of oxygen in the compound C6H12O6. [1] P.S./Chem. June 07 [7] [OVER] Base your answers to questions 56 through 58 on the information below. A 5.00-gram sample of liquid ammonia is originally at 210. K. The diagram of the partial heating curve below represents the vaporization of the sample of ammonia at standard pressure due to the addition of heat. The heat is not added at a constant rate. Temperature (K) Partial Heating Curve for Ammonia 270. 240. 210. A B C D Time Some physical constants for ammonia are shown in the data table below. Some Physical Constants for Ammonia specific heat capacity of NH3( ) 4.71 J/g K heat of fusion 332 J/g heat of vaporization 1370 J/g 56 In the space in your answer booklet, calculate the total heat absorbed by the 5.00-gram sample of ammonia during time interval AB. Your response must include both a correct numerical setup and the calculated result. [2] 57 Describe what is happening to both the potential energy and the average kinetic energy of the molecules in the ammonia sample during time interval BC. Your response must include both potential energy and average kinetic energy. [1] 58 Determine the total amount of heat required to vaporize this 5.00-gram sample of ammonia at its boiling point. [1] P.S./Chem. June 07 [8] Base your answers to questions 59 and 60 on the information below. The unbalanced equation below represents the decomposition of potassium chlorate. KClO3(s) KCl(s) + O2(g) 59 Balance the equation in your answer booklet, using the smallest whole-number coefficients. [1] 60 Determine the oxidation number of chlorine in the reactant. [1] 61 Complete the nuclear equation in your answer booklet. Include the symbol, atomic number, and mass number for the missing particle. [1] 62 Explain, in terms of electronegativity, why a P Cl bond in a molecule of PCl5 is more polar than a P S bond in a molecule of P2S5. [1] 63 A 1.00-mole sample of neon gas occupies a volume of 24.4 liters at 298 K and 101.3 kilopascals. In the space in your answer booklet, calculate the density of this sample. Your response must include both a correct numerical setup and the calculated result. [2] P.S./Chem. June 07 [9] [OVER] Part C Answer all questions in this part. Directions (64 82): Record your answers in the spaces provided in your answer booklet. Some questions may require the use of the Reference Tables for Physical Setting/Chemistry. Base your answers to questions 64 through 66 on the information below. Scientists who study aquatic ecosystems are often interested in the concentration of dissolved oxygen in water. Oxygen, O2, has a very low solubility in water, and therefore its solubility is usually expressed in units of milligrams per 1000. grams of water at 1.0 atmosphere. The graph below shows a solubility curve of oxygen in water. Solubility of Oxygen in Water Versus Temperature Mass of Dissolved O2 (mg) in 1000. g of Water 15.0 10.0 5.0 0 0 10. 20. 30. Temperature ( C) 64 A student determines that 8.2 milligrams of oxygen is dissolved in a 1000.-gram sample of water at 15 C and 1.0 atmosphere. In terms of saturation, what type of solution is this sample? [1] 65 Explain, in terms of molecular polarity, why oxygen gas has low solubility in water. Your response must include both oxygen and water. [1] 66 An aqueous solution has 0.0070 gram of oxygen dissolved in 1000. grams of water. In the space in your answer booklet, calculate the dissolved oxygen concentration of this solution in parts per million. Your response must include both a correct numerical setup and the calculated result. [2] P.S./Chem. June 07 [10] Base your answers to questions 67 and 68 on the information below. Sulfur dioxide, SO2, is one gas produced when fossil fuels are burned. When this gas reacts with water in the atmosphere, an acid is produced forming acid rain. The pH of the water in a lake changes when acid rain collects in the lake. Two samples of the same rainwater are tested using two indicators. Methyl orange is yellow in one sample of this rainwater. Litmus is red in the other sample of this rainwater. 67 Identify a possible pH value for the rainwater that was tested. [1] 68 Write the formula for one substance that can neutralize the lake water affected by acid rain. [1] Base your answers to questions 69 through 72 on the information below. Propane is a fuel that is sold in rigid, pressurized cylinders. Most of the propane in a cylinder is liquid, with gas in the space above the liquid level. When propane is released from the cylinder, the propane leaves the cylinder as a gas. Propane gas is used as a fuel by mixing it with oxygen in the air and igniting the mixture, as represented by the balanced equation below. C3H8(g) + 5O2(g) 3CO2(g) + 4H2O( ) + 2219.2 kJ A small amount of methanethiol, which has a distinct odor, is added to the propane to help consumers detect a propane leak. In methanethiol, the odor is caused by the thiol functional group ( SH). Methanethiol, CH3SH, has a structure that is very similar to the structure of methanol. 69 In the box in your answer booklet, draw a particle diagram to represent propane in a pressurized cylinder using the key in your answer booklet. Your response must include at least six molecules of propane in the gas phase and at least six molecules of propane in the liquid phase. [1] 70 On the diagram in your answer booklet, draw a potential energy diagram for this reaction. [1] 71 Determine the total amount of energy released when 2.50 moles of propane is completely reacted with oxygen. [1] 72 In the space in your answer booklet, draw a structural formula for a molecule of methanethiol. [1] P.S./Chem. June 07 [11] [OVER] Base your answers to questions 73 through 76 on the information below. The table below lists physical and chemical properties of six elements at standard pressure that correspond to known elements on the Periodic Table. The elements are identified by the code letters, D, E, G, J, L, and Q. Properties of Six Elements at Standard Pressure Element D Density 0.00018 g/cm3 Melting point 272 C Boiling point 269 C Oxide formula (none) Element E Density 1.82 g/cm3 Melting point 44 C Boiling point 280 C Oxide formula E2O5 Element G Density 0.53 g/cm3 Melting point 181 C Boiling point 1347 C Oxide formula G2O Element J Density 0.0013 g/cm3 Melting point 210 C Boiling point 196 C Oxide formula J2O5 Element L Density 0.86 g/cm3 Melting point 64 C Boiling point 774 C Oxide formula L2O Element Q Density 0.97 g/cm3 Melting point 98 C Boiling point 883 C Oxide formula Q2O 73 What is the total number of elements in the Properties of Six Elements at Standard Pressure table that are solids at STP? [1] 74 An atom of element G is in the ground state. What is the total number of valence electrons in this atom? [1] 75 Letter Z corresponds to an element on the Periodic Table other than the six listed elements. Elements G, Q, L, and Z are in the same group on the Periodic Table, as shown in the diagram below. G Q L Z Based on the trend in the melting points for elements G, Q, and L listed in the Properties of Six Elements at Standard Pressure table, estimate the melting point of element Z, in degrees Celsius. [1] 76 Identify, by code letter, the element that is a noble gas in the Properties of Six Elements at Standard Pressure table. [1] P.S./Chem. June 07 [12] Base your answers to questions 77 through 79 on the information below. Ozone gas, O3, can be used to kill adult insects in storage bins for grain without damaging the grain. The ozone is produced from oxygen gas, O2, in portable ozone generators located near the storage bins. The concentrations of ozone used are so low that they do not cause any environmental damage. This use of ozone is safer and more environmentally friendly than a method that used bromomethane, CH3Br. However, bromomethane was more effective than ozone because CH3Br killed immature insects as well as adult insects. Adapted From: The Sunday Gazette (Schenectady, NY) 3/9/03 77 Determine the total number of moles of CH3Br in 19 grams of CH3Br (gram-formula mass = 95 grams/mol). [1] 78 Given the balanced equation for producing bromomethane: Br2 + CH4 CH3Br + HBr Identify the type of organic reaction shown. [1] 79 Based on the information in the passage, state one advantage of using ozone instead of bromomethane for insect control in grain storage bins. [1] Base your answers to questions 80 through 82 on the information below. In living organisms, the ratio of the naturally occurring isotopes of carbon, C-12 to C-13 to C-14, is fairly consistent. When an organism such as a woolly mammoth died, it stopped taking in carbon, and the amount of C-14 present in the mammoth began to decrease. For example, one fossil of a woolly mammoth is found to 1 have 32 of the amount of C-14 found in a living organism. 80 Identify the type of nuclear reaction that caused the amount of C-14 in the woolly mammoth to decrease after the organism died. [1] 81 Determine the total time that has elapsed since this woolly mammoth died. [1] 82 State, in terms of subatomic particles, how an atom of C-13 is different from an atom of C-12. [1] P.S./Chem. June 07 [13] The University of the State of New York REGENTS HIGH SCHOOL EXAMINATION PHYSICAL SETTING Tear Here CHEMISTRY Wednesday, June 20, 2007 1:15 to 4:15 p.m., only ANSWER SHEET Student .............................................. Sex: Teacher .............................................. School . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Male Female Grade ........... Record your answers to Part A and Part B 1 on this answer sheet. Part B 1 Part A 1 ............ 11 . . . . . . . . . . . . 21 . . . . . . . . . . . 31 . . . . . . . . . . . . 41 . . . . . . . . . . . . 2 ............ 12 . . . . . . . . . . . . 22 . . . . . . . . . . . 32 . . . . . . . . . . . . 42 . . . . . . . . . . . . 3 ............ 13 . . . . . . . . . . . . 23 . . . . . . . . . . . 33 . . . . . . . . . . . . 43 . . . . . . . . . . . . 4 ............ 14 . . . . . . . . . . . . 24 . . . . . . . . . . . 34 . . . . . . . . . . . . 44 . . . . . . . . . . . . 5 ............ 15 . . . . . . . . . . . . 25 . . . . . . . . . . . 35 . . . . . . . . . . . . 45 . . . . . . . . . . . . 6 ............ 16 . . . . . . . . . . . . 26 . . . . . . . . . . . 36 . . . . . . . . . . . . 46 . . . . . . . . . . . . 7 ............ 17 . . . . . . . . . . . . 27 . . . . . . . . . . . 37 . . . . . . . . . . . . 47 . . . . . . . . . . . . 8 ............ 18 . . . . . . . . . . . . 28 . . . . . . . . . . . 38 . . . . . . . . . . . . 48 . . . . . . . . . . . . 9 ............ 19 . . . . . . . . . . . . 29 . . . . . . . . . . . 39 . . . . . . . . . . . . 49 . . . . . . . . . . . . 10 . . . . . . . . . . . . 20 . . . . . . . . . . . . 30 . . . . . . . . . . . 40 . . . . . . . . . . . . 50 . . . . . . . . . . . . Part B 1 Score Part A Score Write your answers to Part B 2 and Part C in your answer booklet. Tear Here The declaration below should be signed when you have completed the examination. I do hereby affirm, at the close of this examination, that I had no unlawful knowledge of the questions or answers prior to the examination and that I have neither given nor received assistance in answering any of the questions during the examination. Signature PS/CHEMISTRY Tear Here Tear Here PS/CHEMISTRY FOR TEACHERS ONLY The University of the State of New York REGENTS HIGH SCHOOL EXAMINATION PS CH PHYSICAL SETTING/CHEMISTRY Wednesday, June 20, 2007 1:15 to 4:15 p.m., only SCORING KEY AND RATING GUIDE Directions to the Teacher: Refer to the directions on page 3 before rating student papers. Updated information regarding the rating of this examination may be posted on the New York State Education Department s web site during the rating period. Check this web site http://www.emsc.nysed.gov/osa/ and select the link Examination Scoring Information for any recently posted information regarding this examination. This site should be checked before the rating process for this examination begins and several times throughout the Regents examination period. Part A and Part B 1 Allow 1 credit for each correct response. Part B 1 Part A 1 . . . . .4 ....... 11 . . . . .4 ....... 21 . . . . 2 ....... 31 . . . . . 2 ....... 41 . . . . . 2 ....... 2 . . . . .3 ....... 12 . . . . .1 ....... 22 . . . . 2 ....... 32 . . . . . 1 ....... 42 . . . . . 3 ....... 3 . . . . .3 ....... 13 . . . . .3 ....... 23 . . . . 2 ....... 33 . . . . . 2 ....... 43 . . . . . 3 ....... 4 . . . . .4 ....... 14 . . . . .2 ....... 24 . . . . 1 ....... 34 . . . . . 1 ....... 44 . . . . . 3 ....... 5 . . . . .1 ....... 15 . . . . .3 ....... 25 . . . . 4 ....... 35 . . . . . 1 ....... 45 . . . . . 4 ....... 6 . . . . .2 ....... 16 . . . . .4 ....... 26 . . . . 3 ....... 36 . . . . . 1 ....... 46 . . . . . 2 ....... 7 . . . . .1 ....... 17 . . . . .2 ....... 27 . . . . 3 ....... 37 . . . . . 4 ....... 47 . . . . . 3 ....... 8 . . . . .1 ....... 18 . . . . .2 ....... 28 . . . . 3 ....... 38 . . . . . 3 ....... 48 . . . . . 2 ....... 9 . . . . .4 ....... 19 . . . . .2 ....... 29 . . . . 4 ....... 39 . . . . . 4 ....... 49 . . . . . 3 ....... 10 . . . . .2 ....... 20 . . . . .4 ....... 30 . . . . 3 ....... 40 . . . . . 3 ....... 50 . . . . . 2 ....... PHYSICAL SETTING/CHEMISTRY continued Directions to the Teacher Follow the procedures below for scoring student answer papers for the Physical Setting/Chemistry examination. Additional information about scoring is provided in the publication Information Booklet for Scoring Regents Examinations in the Sciences. Use only red ink or red pencil in rating Regents papers. Do not correct the student s work by making insertions or changes of any kind. On the detachable answer sheet for Part A and Part B 1, indicate by means of a check mark each incorrect or omitted answer. In the box provided at the end of each part, record the number of questions the student answered correctly for that part. At least two science teachers must participate in the scoring of each student s responses to the Part B 2 and Part C open-ended questions. Each of these teachers should be responsible for scoring a selected number of the open-ended questions on each answer paper. No one teacher is to score all the open-ended questions on a student s answer paper. Students responses must be scored strictly according to the Scoring Key and Rating Guide. For open-ended questions, credit may be allowed for responses other than those given in the rating guide if the response is a scientifically accurate answer to the question and demonstrates adequate knowledge as indicated by the examples in the rating guide. Complete sentences are not required. Phrases, diagrams, and symbols may be used. In the student s answer booklet, record the number of credits earned for each answer in the box printed to the right of the answer lines or spaces for that question. Fractional credit is not allowed. Only whole-number credit may be given to a response. Units need not be given when the wording of the questions allows such omissions. Raters should enter the scores earned for Part A, Part B 1, Part B 2, and Part C on the appropriate lines in the box printed on the answer booklet and then should add these four scores and enter the total in the box labeled Total Written Test Score. Then, the student s raw score should be converted to a scaled score by using the conversion chart that will be posted on the Department s web site http://www.emsc.nysed.gov/osa/ on Wednesday, June 20, 2007. The student s scaled score should be entered in the labeled box on the student s answer booklet. The scaled score is the student s final examination score. All student answer papers that receive a scaled score of 60 through 64 must be scored a second time. For the second scoring, a different committee of teachers may score the student s paper or the original committee may score the paper, except that no teacher may score the same open-ended questions that he/she scored in the first rating of the paper. The school principal is responsible for assuring that the student s final examination score is based on a fair, accurate, and reliable scoring of the student s answer paper. Because scaled scores corresponding to raw scores in the conversion chart may change from one examination to another, it is crucial that for each administration, the conversion chart provided for that administration be used to determine the student s final score. [3] [OVER] PHYSICAL SETTING/CHEMISTRY continued Part B 2 Allow a total of 15 credits for this part. The student must answer all questions in this part. 51 [1] Allow 1 credit for marking an appropriate scale on the axis labeled Volume (mL). An appropriate scale is linear and allows a trend to be seen. 52 [1] Allow 1 credit for all five points plotted correctly 0.3 grid space. Plotted points do not need to be circled or connected. Examples of 2-credit responses to questions 51 and 52: Pressure Versus Volume of a Gas Sample Pressure Versus Volume of a Gas Sample 5.0 4.0 4.0 Pressure (atm) 6.0 5.0 Pressure (atm) 6.0 3.0 2.0 1.0 3.0 2.0 1.0 0 0 300 600 900 1200 Volume (mL) 300 600 900 1200 Volume (mL) 53 [1] Allow 1 credit for 3.0 atm or for a response consistent with the student s graph 0.3 grid space. Significant figures do not need to be shown. 54 [1] Allow 1 credit. Acceptable responses include, but are not limited to: As temperature increases, the rate of a chemical reaction increases because the reactant particles move faster and collide more often. More reactant molecules have sufficient activation energy. The number of effective collisions per unit time increases. [4] PHYSICAL SETTING/CHEMISTRY continued 55 [1] Allow 1 credit for 53.3%. Significant figures do not need to be shown. 56 [2] Allow a maximum of 2 credits, allocated as follows: Allow 1 credit for a correct numerical setup. Acceptable responses include, but are not limited to: q = mC T = (5.00 g)(4.71 J/g K)(30. K) (5)(4.71)(30) Allow 1 credit for 710 J or for a response consistent with the student s numerical setup. Significant figures do not need to be shown. Note: Do not allow credit for a numerical setup and calculated result that are not related to the concept assessed by the question. 57 [1] Allow 1 credit. Both potential energy and kinetic energy must be included in the student s response to receive credit. Acceptable responses include, but are not limited to: The potential energy of the ammonia molecules increases and the average kinetic energy of the ammonia molecules remains the same. PE increases and KE is constant. 58 [1] Allow 1 credit for 6850 J. Significant figures do not need to be shown. 59 [1] Allow 1 credit for 60 [1] Allow 1 credit for +5. 2 KClO3(s) 2 KCl(s) + [5] 3 O2(g). [OVER] PHYSICAL SETTING/CHEMISTRY continued 61 [1] Allow 1 credit for 42 20Ca. 62 [1] Allow 1 credit. Acceptable responses include, but are not limited to: A P Cl bond is more polar than a P S bond because the electronegativity difference for P Cl is 1.0 and the electronegativity difference for P S is 0.4. Cl has a higher electronegativity value than S. A chlorine atom has a greater attraction for electrons in a bond than a sulfur atom. 63 [2] Allow a maximum of 2 credits, allocated as follows: Allow 1 credit for a correct numerical setup. Acceptable responses include, but are not limited to: d= m 20.179 g = V 24.4 L 20 24.4 Allow 1 credit for 0.827 g/L or for a response consistent with the student s numerical setup. Significant figures do not need to be shown. Note: Do not allow credit for a numerical setup and calculated result that are not related to the concept assessed by the question. [6] PHYSICAL SETTING/CHEMISTRY continued Part C Allow a total of 20 credits for this part. The student must answer all questions in this part. 64 [1] Allow 1 credit. Acceptable responses include, but are not limited to: The sample is an unsaturated solution. unsaturated 65 [1] Allow 1 credit. Both oxygen and water must be included in the student s response to receive credit. Acceptable responses include, but are not limited to: Oxygen molecules are nonpolar and water molecules are polar. Because H2O and O2 have different polarities, O2 has low solubility in H2O. oxygen nonpolar, water polar 66 [2] Allow a maximum of 2 credits, allocated as follows: Allow 1 credit for a correct numerical setup. Acceptable responses include, but are not limited to: ppm = 0.0070 gram O2 1 000 000 (1000. grams of water + 0.0070 gram of O2 ) (0.0070 / 1000.0070) 1 000 000 Allow 1 credit for 7.0 ppm or for a response consistent with the student s numerical setup. Significant figures do not need to be shown. Note: Do not allow credit for a numerical setup and calculated result that are not related to the concept assessed by the question. 67 [1] Allow 1 credit for a pH value that is greater than or equal to 4.4, but is less than or equal to 5.5. 68 [1] Allow 1 credit. Acceptable responses include, but are not limited to: Ca(OH)2 KOH Na2CO3 [7] [OVER] PHYSICAL SETTING/CHEMISTRY continued 69 [1] Allow 1 credit. Molecules of the gas must be drawn farther apart than molecules of the liquid. Example of a 1-credit response: 70 [1] Allow 1 credit. Potential Energy Example of a 1-credit response: Reaction Coordinate 71 [1] Allow 1 credit. Significant figures do not need to be shown. Acceptable responses include, but are not limited to: 5550 kJ 5.5 103 kJ [8] PHYSICAL SETTING/CHEMISTRY continued 72 [1] Allow 1 credit. Examples of 1-credit responses: H H C SH H C SH 73 [1] Allow 1 credit for 4 or four. 74 [1] Allow 1 credit for 1 or one. 75 [1] Allow 1 credit for a temperature value below 64 C. 76 [1] Allow 1 credit for D or He. 77 [1] Allow 1 credit for 0.20 mol. Significant figures do not need to be shown. 78 [1] Allow 1 credit. Acceptable responses include, but are not limited to: substitution bromination halogenation 79 [1] Allow 1 credit. Acceptable responses include, but are not limited to: Ozone is better to use because it is safer than bromomethane. O3 is more environmentally friendly. [9] [OVER] PHYSICAL SETTING/CHEMISTRY concluded 80 [1] Allow 1 credit. Acceptable responses include, but are not limited to: natural transmutation transmutation beta decay radioactive decay 81 [1] Allow 1 credit for 28 650 y. Significant figures do not need to be shown. 82 [1] Allow 1 credit. Acceptable responses include, but are not limited to: A C-13 atom has seven neutrons and a C-12 atom has six neutrons. An atom of C-13 and an atom of C-12 have different numbers of neutrons. The number of neutrons is different. [10] Regents Examination in Physical Setting/Chemistry June 2007 Chart for Converting Total Test Raw Scores to Final Examination Scores (Scaled Scores) The Chart for Determining the Final Examination Score for the June 2007 Regents Examination in Physical Setting/Chemistry will be posted on the Department s web site http://www.emsc.nysed.gov/osa/ on Wednesday, June 20, 2007. Conversion charts provided for previous administrations of the Regents Examination in Physical Setting/Chemistry must NOT be used to determine students final scores for this administration. Submitting Teacher Evaluations of the Test to the Department Suggestions and feedback from teachers provide an important contribution to the test development process. The Department provides an online evaluation form for State assessments. It contains spaces for teachers to respond to several specific questions and to make suggestions. Instructions for completing the evaluation form are as follows: 1. Go to www.emsc.nysed.gov/osa/exameval. 2. Select the test title. 3. Complete the required demographic fields. 4. Complete each evaluation question and provide comments in the space provided. 5. Click the SUBMIT button at the bottom of the page to submit the completed form. [11] [OVER] Map to Core Curriculum June 2007 Physical Setting/Chemistry Key Ideas/Performance Indicators Math Key Idea 1 Math Key Idea 2 Math Key Idea 3 Science Inquiry Key Idea 1 Science Inquiry Key Idea 2 Science Inquiry Key Idea 3 Engineering Design Key Idea 1 Question Numbers Part A Part B Standard 1 42, 43, 51, 52, 56, 63 53 55, 58, 60, 62, 63 37, 62 36, 48, 49, 60 Part C 66, 77 64, 74, 75 66, 71, 77, 81 68 67, 73, 76 Standard 2 Key Idea 1 Key Idea 2 Standard 6 Key Idea 1 Key Idea 2 Key Idea 3 Key Idea 4 Key Idea 5 72 69 44 Standard 7 Key Idea 1 Key Idea 2 Key Idea 3 Key Idea 4 Key Idea 5 Key Idea 3 Key Idea 4 Key Idea 5 2002 Edition 79 Standard 4 Process Skills 31, 32, 33, 34, 35, 38, 39, 40, 43, 44, 45, 46, 47, 48, 49, 54, 59 50, 56, 57, 58, 61 41 Standard 4 1, 2, 3, 4, 5, 6, 7, 31, 32, 33, 34, 13, 14, 15, 16, 36, 37, 38, 39, 17, 19, 20, 22, 42, 43, 44, 45, 23, 24, 25, 26, 28 46, 47, 48, 49, 51, 52, 53, 54, 55, 59, 60, 63 12, 18, 27, 29 50, 57, 58, 61 8, 9, 10, 11, 21, 35, 40, 41, 62 30 Reference Tables 2, 5, 6, 9, 13, 18, 31, 34, 36, 40, 19, 21, 27 42, 43, 45, 46, 47, 48, 49, 55, 56, 58, 60, 61, 62, 63 [12] 64, 66, 67, 68, 69, 72, 73, 74, 75, 76, 77, 78, 80, 82 70, 81 65 64, 66, 67, 68, 69, 72, 73, 74, 75, 76, 77, 78, 82 70, 71, 80, 81 65, 79 66, 67, 68, 71, 72, 73, 74, 75, 76, 77, 81, 82

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