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New York Regents Chemistry January 2007

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New York State Regents Exams
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PS/CHEMISTRY The University of the State of New York REGENTS HIGH SCHOOL EXAMINATION PHYSICAL SETTING CHEMISTRY Thursday, January 25, 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 Which subatomic particles are located in the nucleus of a neon atom? (1) electrons and positrons (2) electrons and neutrons (3) protons and neutrons (4) protons and electrons 6 An atom of argon rarely bonds to an atom of another element because an argon atom has (1) 8 valence electrons (2) 2 electrons in the first shell (3) 3 electron shells (4) 22 neutrons 2 The total mass of the protons in an atom of gold-198 is approximately (1) 79 atomic mass units (2) 119 atomic mass units (3) 198 atomic mass units (4) 277 atomic mass units 7 The elements on the Periodic Table are arranged in order of increasing (1) boiling point (3) atomic number (2) electronegativity (4) atomic mass 8 Which element is classified as a nonmetal? (1) Be (3) Si (2) Al (4) Cl 3 In a calcium atom in the ground state, the electrons that possess the least amount of energy are located in the (1) first electron shell (2) second electron shell (3) third electron shell (4) fourth electron shell 9 Solid samples of the element phosphorus can be white, black, or red in color. The variations in color are due to different (1) atomic masses (2) molecular structures (3) ionization energies (4) nuclear charges 4 Which group of atomic models is listed in historical order from the earliest to the most recent? (1) hard-sphere model, wave-mechanical model, electron-shell model (2) hard-sphere model, electron-shell model, wave-mechanical model (3) electron-shell model, wave-mechanical model, hard-sphere model (4) electron-shell model, hard-sphere model, wave-mechanical model 10 Given the balanced equation representing the reaction between propane and oxygen: C3H8 + 5O2 3CO2 + 4H2O According to this equation, which ratio of oxygen to propane is correct? (1) (2) 8C 6 P.S./Chem. Jan. 07 (4) 14 C 6 [2] (3) 10 grams O2 11 grams C3H8 (2) 5 Which isotopic notation represents an atom of carbon-14? 6C (1) 6 (3) 14 8C 5 grams O2 1 gram C3H8 5 moles O2 1 mole C3H8 (4) 10 moles O2 11 moles C3H8 11 Lithium and potassium have similar chemical properties because the atoms of both elements have the same (1) mass number (2) atomic number (3) number of electron shells (4) number of valence electrons 16 The balanced equation below represents a molecule of bromine separating into two bromine atoms. Br2 Br + Br What occurs during this change? (1) Energy is absorbed and a bond is formed. (2) Energy is absorbed and a bond is broken. (3) Energy is released and a bond is formed. (4) Energy is released and a bond is broken. 12 Which two substances are covalent compounds? (1) C6H12O6(s) and KI(s) (2) C6H12O6(s) and HCl(g) (3) KI(s) and NaCl(s) (4) NaCl(s) and HCl(g) 17 Which substance can be decomposed by chemical means? (1) tungsten (3) krypton (2) antimony (4) methane 13 Which substance, when dissolved in water, forms a solution that conducts an electric current? (1) C2H5OH (3) C12H22O11 (2) C6H12O6 (4) CH3COOH 18 Bronze contains 90 to 95 percent copper and 5 to 10 percent tin. Because these percentages can vary, bronze is classified as (1) a compound (3) a mixture (2) an element (4) a substance 14 Given the diagram representing a reaction: 1n 0 235 92 U 137 52 Te 97 40 Zr 19 Compared to a 2.0 M aqueous solution of NaCl at 1 atmosphere, a 3.0 M aqueous solution of NaCl at 1 atmosphere has a (1) lower boiling point and a higher freezing point (2) lower boiling point and a lower freezing point (3) higher boiling point and a higher freezing point (4) higher boiling point and a lower freezing point 1n 0 1n 0 Which phrase best describes this type of reaction and the overall energy change that occurs? (1) nuclear, and energy is released (2) nuclear, and energy is absorbed (3) chemical, and energy is released (4) chemical, and energy is absorbed 20 In which reaction are electrons transferred from one reactant to another reactant? (1) 2Ca(s) + O2(g) 2CaO(s) (2) AgNO3(aq) + KCl(aq) AgCl(s) + KNO3(aq) (3) HCl(aq) + NaOH(aq) NaCl(aq) + H2O( ) (4) H3O+(aq) + OH (aq) 2H2O( ) 15 Compared to a phosphorus atom, a P3 ion has (1) more electrons and a larger radius (2) more electrons and a smaller radius (3) fewer electrons and a larger radius (4) fewer electrons and a smaller radius P.S./Chem. Jan. 07 [3] [OVER] 25 Two substances have different physical and chemical properties. Both substances have molecules that contain two carbon atoms, one oxygen atom, and six hydrogen atoms. These two substances must be (1) isomers of each other (2) isotopes of each other (3) the same compound (4) the same hydrocarbon 21 Which statement must be true for any chemical reaction at equilibrium? (1) The concentration of the products is greater than the concentration of the reactants. (2) The concentration of the products is less than the concentration of the reactants. (3) The concentration of the products and the concentration of the reactants are equal. (4) The concentration of the products and the concentration of the reactants are constant. 26 Given the balanced equation representing a reaction: 22 Given the structural formula: H H H H CH3CH2CH3 + Br2 CH3CH2CH2Br + HBr O H C C C C C OH H H This organic reaction is best classified as (1) an addition reaction (2) an esterification reaction (3) a polymerization reaction (4) a substitution reaction H H What is the IUPAC name of this compound? (1) pentanal (3) methyl pentanoate (2) pentanol (4) pentanoic acid 27 In terms of energy and entropy, systems in nature tend to undergo changes toward (1) higher energy and higher entropy (2) higher energy and lower entropy (3) lower energy and higher entropy (4) lower energy and lower entropy 23 Which structural formula represents an unsaturated hydrocarbon? H H H C C H H H H H C H H (1) H H C OH (2) H O H C H (4) 29 Which compound has hydrogen bonding between its molecules? (1) CH4 (3) KH (2) CaH2 (4) NH3 24 Which group of nuclear emissions is listed in order of increasing charge? (1) alpha particle, beta particle, gamma radiation (2) gamma radiation, alpha particle, beta particle (3) positron, alpha particle, neutron (4) neutron, positron, alpha particle P.S./Chem. Jan. 07 C What is the total number of electrons shared in the bond between the two carbon atoms? (1) 6 (3) 3 (2) 2 (4) 4 H C H 28 Given the structural formula: (3) O C C 30 Which ion is the only negative ion produced by an Arrhenius base in water? (1) NO3 (3) OH (2) Cl (4) H [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 When the elements in Group 1 are considered in order from top to bottom, each successive element at standard pressure has (1) a higher melting point and a higher boiling point (2) a higher melting point and a lower boiling point (3) a lower melting point and a higher boiling point (4) a lower melting point and a lower boiling point 36 Given the balanced equation representing a reaction: 4NH3 + 5O2 4NO + 6H2O What is the minimum O2 that are needed to 16 moles of NH3? (1) 16 mol (2) 20. mol (3) 64 mol (4) 80. mol 37 Which Lewis electron-dot diagram correctly represents a hydroxide ion? 32 Which isotopic notation identifies a metalloid that is matched with the corresponding number of protons in each of its atoms? (1) 24Mg and 12 protons (2) 28Si and 14 protons (3) 75As and 75 protons (4) 80Br and 80 protons OH O H (1) (3) OH (2) 33 At STP, which list of elements contains a solid, a liquid, and a gas? (1) Hf, Hg, He (2) Cr, Cl2, C number of moles of completely react with O H (4) 38 A 10.0-gram sample of which element has the smallest volume at STP? (1) aluminum (3) titanium (2) magnesium (4) zinc (3) Ba, Br2, B (4) Se, Sn, Sr 34 Element X reacts with iron to form two different compounds with the formulas FeX and Fe2X3. To which group on the Periodic Table does element X belong? (1) Group 8 (3) Group 13 (2) Group 2 (4) Group 16 39 At which temperature would atoms of a He(g) sample have the greatest average kinetic energy? (1) 25 C (3) 273 K (2) 37 C (4) 298 K 35 The molar mass of Ba(OH)2 is (1) 154.3 g (3) 171.3 g (2) 155.3 g (4) 308.6 g P.S./Chem. Jan. 07 [5] [OVER] 40 A student prepares four aqueous solutions, each with a different solute. The mass of each dissolved solute is shown in the table below. Mass of Dissolved Solute for Four Aqueous Solutions Solution Number Solute Mass of Dissolved Solute (per 100. g of H2O at 20. C) 1 Kl 120. g 2 NaNO3 88 g 3 KCl 25 g 4 KClO3 5g Which solution is saturated? (1) 1 (2) 2 (3) 3 (4) 4 41 At room temperature, a mixture of sand and water can be separated by (1) ionization (3) filtration (2) combustion (4) sublimation 44 Given the system at equilibrium: 2POCl3(g) + energy Which changes occur when O2(g) is added to this system? (1) The equilibrium shifts to the right and the concentration of PCl3(g) increases. (2) The equilibrium shifts to the right and the concentration of PCl3(g) decreases. (3) The equilibrium shifts to the left and the concentration of PCl3(g) increases. (4) The equilibrium shifts to the left and the concentration of PCl3(g) decreases. 42 Given the balanced equation representing a reaction at 101.3 kPa and 298 K: N2(g) + 3H2(g) 2NH3(g) + 91.8 kJ Which statement is true about this reaction? (1) It is exothermic and H equals 91.8 kJ. (2) It is exothermic and H equals +91.8 kJ. (3) It is endothermic and H equals 91.8 kJ. (4) It is endothermic and H equals +91.8 kJ. 45 What is the oxidation number of chromium in the chromate ion, CrO42 ? (1) +6 (3) +3 (2) +2 (4) +8 43 Which balanced equation represents a phase equilibrium? (1) H2(g) + I2(g) 2HI(g) (2) 2NO2(g) N2O4(g) (3) Cl2(g) Cl2( ) (4) 3O2(g) 2O3(g) P.S./Chem. Jan. 07 2PCl3(g) + O2(g) [6] 46 Given the balanced equation representing a reaction: 49 If 1 8 of an original sample of krypton-74 remains unchanged after 34.5 minutes, what is the half-life of krypton-74? (1) 11.5 min (3) 34.5 min (2) 23.0 min (4) 46.0 min H2SO4(aq) + 2KOH(aq) K2SO4(aq) + 2H2O( ) Which type of reaction is represented by this equation? (1) decomposition (3) single replacement (2) neutralization (4) synthesis 50 Given the nuclear equation: 253 99Es 47 In which 0.01 M solution is phenolphthalein pink? (1) CH3OH(aq) (3) CH3COOH(aq) (2) Ca(OH)2(aq) (4) HNO3(aq) 256 +X 1 0 n + 101Md Which particle is represented by X? (3) 1 (1) 4 2 He 0n 0e (2) 1 0e (4) +1 48 As the pH of a solution is changed from 3 to 6, the concentration of hydronium ions (1) increases by a factor of 3 (2) increases by a factor of 1000 (3) decreases by a factor of 3 (4) decreases by a factor of 1000 P.S./Chem. Jan. 07 [7] [OVER] Part B 2 Answer all questions in this part. Directions (51 66): 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. 51 Naturally occurring boron is composed of two isotopes. The percent abundance and the mass of each isotope are listed below. 19.9% of the boron atoms have a mass of 10.013 atomic mass units. 80.1% of the boron atoms have a mass of 11.009 atomic mass units. In the space in your answer booklet, calculate the atomic mass of boron. Your response must include both a correct numerical setup and the calculated result. [2] Base your answers to questions 52 and 53 on the information below. During a laboratory activity, a student reacted a piece of zinc with 0.1 M HCl(aq). 52 Complete the equation in your answer booklet by writing the formula of the missing product. [1] 53 Based on Reference Table J, identify one metal that does not react spontaneously with HCl(aq). [1] 54 A hydrated compound contains water molecules within its crystal structure. The percent composition by mass of water in the hydrated compound CaSO4 2H2O has an accepted value of 20.9%. A student did an experiment and determined that the percent composition by mass of water in CaSO4 2H2O was 21.4%. In the space in your answer booklet, calculate the percent error of the student s experimental result. Your response must include both a correct numerical setup and the calculated result. [2] P.S./Chem. Jan. 07 [8] Base your answers to questions 55 through 57 on the information below. The particle diagrams below represent the reaction between two nonmetals, A2 and Q2. Key = Atom of element A = Atom of element Q Reactants Product 55 Using the symbols A and Q, write the chemical formula of the product. [1] 56 Identify the type of chemical bond between an atom of element A and an atom of element Q. [1] 57 Compare the total mass of the reactants to the total mass of the product. [1] 58 A potential energy diagram for a chemical reaction is shown in your answer booklet. On this diagram, draw a curve to show how the potential energy diagram will change when a catalyst is added to the reaction. [1] 59 Explain, in terms of collision theory, why an increase in temperature increases the rate of a chemical reaction. [1] 60 An aqueous solution contains 300. parts per million of KOH. Determine the number of grams of KOH present in 1000. grams of this solution. [1] P.S./Chem. Jan. 07 [9] [OVER] Base your answers to questions 61 through 63 on the diagram below. The diagram shows a voltaic cell with copper and aluminum electrodes immediately after the external circuit is completed. Voltaic Cell V Voltmeter Wire Salt bridge Cu(s) electrode 2+ Al(s) electrode 3+ Cu (aq) Al (aq) Half-cell 1 Half-cell 2 61 Balance the redox equation in your answer booklet, using the smallest whole-number coefficients. [1] 62 As this voltaic cell operates, the mass of the Al(s) electrode decreases. Explain, in terms of particles, why this decrease in mass occurs. [1] 63 Explain the function of the salt bridge. [1] 64 Identify two indicators from Reference Table M that are yellow in solutions with a pH of 5.5. [1] 65 Explain, in terms of molecular structure or distribution of charge, why a molecule of methane is nonpolar. [1] 66 A liquid boils when the vapor pressure of the liquid equals the atmospheric pressure on the surface of the liquid. Using Reference Table H, determine the boiling point of water when the atmospheric pressure is 90. kPa. [1] P.S./Chem. Jan. 07 [10] Part C Answer all questions in this part. Directions (67 83): 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 67 through 70 on the information below, which describes the proposed discovery of element 118. In 1999, a nuclear chemist and his team announced they had discovered a new element by crashing krypton atoms into lead. The new element, number 118, was assigned the name ununoctium and the symbol Uuo. One possible isotope of ununoctium could have been Uuo-291. However, the discovery of Uuo was not confirmed because other scientists could not reproduce the experimental results published by the nuclear chemist and his team. In 2006, another team of scientists claimed that they produced Uuo. This claim has yet to be confirmed. Adapted from Discover January 2002 67 Based on atomic number, in which group on the Periodic Table would element 118 be placed? [1] 68 What would be the total number of neutrons present in a theoretical atom of Uuo-291? [1] 69 What would be the total number of electrons present in a theoretical atom of Uuo-291? [1] 70 Explain why being able to reproduce scientific results is an important component of scientific research. [1] P.S./Chem. Jan. 07 [11] [OVER] Base your answers to questions 71 through 74 on the information below. Have you ever seen an insect called a water strider skating across the surface of a calm pond? Have you ever floated a sewing needle on the water in a glass? If you have, then you ve observed one of water s many amazing properties. Water s surface tension keeps the water strider and the sewing needle from sinking into the water. Simply stated, the surface tension is due to the forces that hold the water molecules together. Without these intermolecular forces, the water strider and the sewing needle would sink below the surface of the water. The surface tension of water at various temperatures is given in the data table below. Surface Tension at Different Water Temperatures Water Temperature ( C) Surface Tension (mN/m) 10. 74.2 25 72.0 50. 67.9 75 63.6 100. 58.9 71 On the grid in your answer booklet, plot the data from the data table. Circle and connect the five points. [1] Example: 72 According to your graph, what is the surface tension of water at 60. C? [1] 73 State the relationship between the surface tension and the temperature of water. [1] 74 The surface tension of liquid tetrachloromethane, CCl4, at 25 C is 26.3 millinewtons/meter (mN/m). Compare the intermolecular forces between molecules of CCl4 to the intermolecular forces between molecules of water, H2O, at 25 C. [1] P.S./Chem. Jan. 07 [12] Base your answers to questions 75 through 77 on the information below. A rigid cylinder is fitted with a movable piston. The cylinder contains a sample of helium gas, He(g), which has an initial volume of 125.0 milliliters and an initial pressure of 1.0 atmosphere, as shown below. The temperature of the helium gas sample is 20.0 C. Handle Movable piston 1.0 150.0 mL 125.0 mL 2.0 0 100.0 mL 3.0 Pressure gauge ATM 75.0 mL Rigid cylinder 50.0 mL 25.0 mL 75 Express the initial volume of the helium gas sample, in liters. [1] 76 The piston is pushed further into the cylinder. In the space in your answer booklet, show a correct numerical setup for calculating the volume of the helium gas that is anticipated when the reading on the pressure gauge is 1.5 atmospheres. The temperature of the helium gas remains constant. [1] 77 Helium gas is removed from the cylinder and a sample of nitrogen gas, N2(g), is added to the cylinder. The nitrogen gas has a volume of 125.0 milliliters and a pressure of 1.0 atmosphere at 20.0 C. Compare the number of particles in this nitrogen gas sample to the number of particles in the original helium gas sample. [1] P.S./Chem. Jan. 07 [13] [OVER] Base your answers to questions 78 through 81 on the information below. In preparing to titrate an acid with a base, a student puts on goggles and an apron. The student uses burets to dispense and measure the acid and the base in the titration. In each of two trials, a 0.500 M NaOH(aq) solution is added to a flask containing a volume of HCl(aq) solution of unknown concentration. Phenolphthalein is the indicator used in the titration. The calculated volumes used for the two trials are recorded in the table below. Volumes of Base and Acid Used in Titration Trials Trial 1 Solution (aq) NaOH HCl Trial 2 Molarity (M) Volume Used (mL) Volume Used (mL) 0.500 17.03 16.87 ? 10.22 10.12 78 Write a chemical name for the acid used in the titration. [1] 79 Using the volumes from trial 1, determine the molarity of the HCl(aq) solution. [1] 80 Based on the information given in the table, how many significant figures should be shown in the calculated molarity of the HCl(aq) solution used in trial 2? [1] 81 Identify one additional safety precaution the student should have taken before performing the titration. [1] P.S./Chem. Jan. 07 [14] Base your answers to questions 82 and 83 on the information below. A gasoline engine burns gasoline in the presence of excess oxygen to form carbon dioxide and water. The main components of gasoline are isomers of octane. A structural formula of octane is shown below. H H H H H H H H H C C C C C C C C H H H H H H H H H One isomer of octane is 2,2,4-trimethylpentane. 82 In the space in your answer booklet, draw a structural formula for 2,2,4-trimethylpentane. [1] 83 Explain, in terms of the arrangement of particles, why the entropy of gasoline vapor is greater than the entropy of liquid gasoline. [1] P.S./Chem. Jan. 07 [15] The University of the State of New York REGENTS HIGH SCHOOL EXAMINATION PHYSICAL SETTING Tear Here CHEMISTRY Thursday, January 25, 2007 1:15 to 4:15 p.m., only ANSWER SHEET Student .............................................. Sex: Male Female Grade ........... Teacher .............................................. School . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 Thursday, January 25, 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 . . . . .3 ....... 11 . . . . .4 ....... 21 . . . . 4 ....... 31 . . . . . 4 ....... 41 . . . . . 3 ....... 2 . . . . .1 ....... 12 . . . . .2 ....... 22 . . . . 4 ....... 32 . . . . . 2 ....... 42 . . . . . 1 ....... 3 . . . . .1 ....... 13 . . . . .4 ....... 23 . . . . 3 ....... 33 . . . . . 1 ....... 43 . . . . . 3 ....... 4 . . . . .2 ....... 14 . . . . .1 ....... 24 . . . . 4 ....... 34 . . . . . 4 ....... 44 . . . . . 4 ....... 5 . . . . .4 ....... 15 . . . . .1 ....... 25 . . . . 1 ....... 35 . . . . . 3 ....... 45 . . . . . 1 ....... 6 . . . . .1 ....... 16 . . . . .2 ....... 26 . . . . 4 ....... 36 . . . . . 2 ....... 46 . . . . . 2 ....... 7 . . . . .3 ....... 17 . . . . .4 ....... 27 . . . . 3 ....... 37 . . . . . 1 ....... 47 . . . . . 2 ....... 8 . . . . .4 ....... 18 . . . . .3 ....... 28 . . . . 1 ....... 38 . . . . . 4 ....... 48 . . . . . 4 ....... 9 . . . . .2 ....... 19 . . . . .4 ....... 29 . . . . 4 ....... 39 . . . . . 2 ....... 49 . . . . . 1 ....... 10 . . . . .2 ....... 20 . . . . .1 ....... 30 . . . . 3 ....... 40 . . . . . 2 ....... 50 . . . . . 1 ....... Part B 1 Score 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 checkmark 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 Thursday, January 25, 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 18 credits for this part. The student must answer all questions in this part. 51 [2] Allow a maximum of 2 credits, allocated as follows: Allow 1 credit for a correct numerical setup. Significant figures do not need to be shown. Acceptable responses include, but are not limited to: (10.013)(0.199) + (11.009)(0.801) (19.9)(10.013) + (80.1)(11.009) 100 (10.013)(19.9%) + (11.009)(80.1%) Allow 1 credit. Significant figures do not need to be shown. Acceptable responses include, but are not limited to: 10.8 atomic mass units 10.81 atomic mass units 10.8108 atomic mass units or Allow 1 credit for a response consistent with the student s numerical setup. Note: Do not allow credit for a numerical setup and a calculated result that are not related to the concept assessed by the question. 52 [1] Allow 1 credit for ZnCl2. 53 [1] Allow 1 credit. Acceptable responses include, but are not limited to: Cu Ag gold [4] PHYSICAL SETTING/CHEMISTRY continued 54 [2] Allow a maximum of 2 credits, allocated as follows: Allow 1 credit for a correct numerical setup. Significant figures do not need to be shown. Acceptable responses include, but are not limited to: 21.4% 20.9% 100 20.9% 21.4 20.9 100 20.9 Allow 1 credit. Significant figures do not need to be shown. Acceptable responses include, but are not limited to: 2% 2.4% 2.39% or Allow 1 credit for a response consistent with the student s numerical setup. Note: Do not allow credit for a numerical setup and a calculated result that are not related to the concept assessed by the question. 55 [1] Allow 1 credit. Acceptable responses include, but are not limited to: AQ2 Q2 A 56 [1] Allow 1 credit. Acceptable responses include, but are not limited to: polar covalent covalent [5] [OVER] PHYSICAL SETTING/CHEMISTRY continued 57 [1] Allow 1 credit. Acceptable responses include, but are not limited to: The total mass of reactants equals the total mass of product. Mass of reactants equals mass of product. Mass is conserved. 58 [1] Allow 1 credit for a correct response that shows an activation energy that is higher than the potential energy of the reactants and lower than the original activation energy. Potential Energy Example of a 1-credit response: Reaction Coordinate 59 [1] Allow 1 credit. Acceptable responses include, but are not limited to: As molecules acquire more kinetic energy, the number of effective collisions increases. higher temperature, greater frequency of collisions 60 [1] Allow 1 credit for 0.300 g. Significant figures do not need to be shown. 61 [1] Allow 1 credit for 62 [1] Allow 1 credit. Acceptable responses include, but are not limited to: 3 Cu2+(aq) + 2 Al(s) 3 Cu(s) + 2 Al3+(aq). Aluminum atoms are losing electrons and becoming aluminum ions that are entering the solution. [6] PHYSICAL SETTING/CHEMISTRY continued 63 [1] Allow 1 credit. Acceptable responses include, but are not limited to: It allows migration of ions. maintains neutrality prevents polarization 64 [1] Allow 1 credit for any two of the following responses: methyl orange bromthymol blue thymol blue 65 [1] Allow 1 credit. Acceptable responses include, but are not limited to: Methane is nonpolar because its molecules are symmetrical. Charges are evenly distributed throughout the molecule. 66 [1] Allow 1 credit for 97 C 1 C. [7] [OVER] PHYSICAL SETTING/CHEMISTRY continued Part C Allow a total of 17 credits for this part. The student must answer all questions in this part. 67 [1] Allow 1 credit. Acceptable responses include, but are not limited to: Group 18 noble gases 68 [1] Allow 1 credit for 173. 69 [1] Allow 1 credit for 118. 70 [1] Allow 1 credit. Acceptable responses include, but are not limited to: Reproducing results verifies that the results are valid. reliability of results [8] PHYSICAL SETTING/CHEMISTRY continued 71 [1] Allow 1 credit for correctly plotting all five points 0.3 grid space. Plotted points do not need to be circled or connected. Example of a 1-credit response: Surface Tension Versus Water Temperature Surface Tension (mN/m) 75.0 70.0 65.0 60.0 55.0 0 20. 40. 60. 80. 100. Water Temperature ( C) 72 [1] Allow 1 credit for 66.1 mN/m 0.3 mN/m. Significant figures do not need to be shown. or Allow 1 credit for a response consistent with the student s graph in question 71. 73 [1] Allow 1 credit. Acceptable responses include, but are not limited to: Surface tension will decrease as temperature increases. as temperature , surface tension Note: Do not allow credit for inverse relationship. [9] [OVER] PHYSICAL SETTING/CHEMISTRY continued 74 [1] Allow 1 credit. Acceptable responses include, but are not limited to: Tetrachloromethane, CCl4, has weaker intermolecular forces than water, H2O. Surface tension of water at 25 C is greater than 26.3 mN/m, so the intermolecular forces of water are stronger. The forces between water molecules are greater. 75 [1] Allow 1 credit. Acceptable responses include, but are not limited to: 0.1250 L 0.125 L 1.25 10 1 L 76 [1] Allow 1 credit. Acceptable responses include, but are not limited to: V2 = (1.0 atm)(125.0 mL) 1.5 atm (1.0)(125) = (1.50)(V2) or Allow 1 credit for a response consistent with the student s answer to question 75. 77 [1] Allow 1 credit. Acceptable responses include, but are not limited to: Both samples have the same number of particles. Equal volumes of gases at the same temperature and pressure contain the same number of particles. 78 [1] Allow 1 credit for hydrochloric acid. [10] PHYSICAL SETTING/CHEMISTRY concluded 79 [1] Allow 1 credit. Significant figures do not need to be shown. Acceptable responses include, but are not limited to: 0.833 M 8.3 10 1 M 80 [1] Allow 1 credit for 3 or three. 81 [1] Allow 1 credit. Acceptable responses include, but are not limited to: wearing gloves no open-toed shoes 82 [1] Allow 1 credit. Examples of a 1-credit response: H H C H H H H H H C C C C C H H H H H C H H C H H C H C C C C C C C 83 [1] Allow 1 credit. Acceptable responses include, but are not limited to: The arrangement of molecules in the vapor state are more random or disordered. Particles in the vapor state are farther apart and move more freely. [11] [OVER] Regents Examination in Physical Setting/Chemistry January 2007 Chart for Converting Total Test Raw Scores to Final Examination Scores (Scaled Scores) The Chart for Determining the Final Examination Score for the January 2007 Regents Examination in Physical Setting/Chemistry will be posted on the Department s web site http://www.emsc.nysed.gov/osa/ on Thursday, January 25, 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. [12] [13]

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