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New York Regents Chemistry January 2014

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P.S./CHEMISTRY The University of the State of New York REGENTS HIGH SCHOOL EXAMINATION PHYSICAL SETTING CHEMISTRY Wednesday, January 29, 2014 1:15 to 4:15 p.m., only The possession or use of any communications device is strictly prohibited when taking this examination. If you have or use any communications device, no matter how briefly, your examination will be invalidated and no score will be calculated for you. 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 2011 Edition Reference Tables for Physical Setting/Chemistry. You are to answer all questions in all parts of this examination according to the directions provided in this examination booklet. A separate answer sheet for Part A and Part B 1 has been provided to you. Follow the instructions from the proctor for completing the student information on your answer sheet. Record your answers to the Part A and Part B 1 multiple-choice questions on this separate answer sheet. Record your answers for the questions in Part B 2 and Part C in your separate answer booklet. Be sure to fill in the heading on the front of your answer booklet. All answers in your answer booklet 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 or in your answer booklet as directed. When you have completed the examination, you must sign the statement printed on 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 2011 Edition Reference Tables for Physical Setting/Chemistry must be available for you to use while taking this examination. DO NOT OPEN THIS EXAMINATION BOOKLET UNTIL THE SIGNAL IS GIVEN. P.S./CHEMISTRY Part A Answer all questions in this part. Directions (1 30): For each statement or question, record on your 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 2011 Edition Reference Tables for Physical Setting/Chemistry. 1 What is the approximate mass of a proton? (1) 1 u (3) 1 g (2) 0.0005 u (4) 0.0005 g 7 What is formed when two atoms of bromine bond together? (1) a monatomic molecule (2) a diatomic molecule (3) a heterogeneous mixture (4) a homogeneous mixture 2 An electron in a sodium atom gains enough energy to move from the second shell to the third shell. The sodium atom becomes (1) a positive ion (2) a negative ion (3) an atom in an excited state (4) an atom in the ground state 8 Gold can be flattened into an extremely thin sheet. The malleability of gold is due to the (1) radioactive decay mode of the isotope Au-198 (2) proton-to-neutron ratio in an atom of gold (3) nature of the bonds between gold atoms (4) reactivity of gold atoms 3 Which particle has no charge? (1) electron (3) positron (2) neutron (4) proton 9 Which term represents the attraction one atom has for the electrons in a bond with another atom? (1) electronegativity (2) electrical conductivity (3) first ionization energy (4) mechanical energy 4 Which quantity represents the number of protons in an atom? (1) atomic number (2) oxidation number (3) number of neutrons (4) number of valence electrons 10 Salt water is classified as a (1) compound because the proportion atoms is fixed (2) compound because the proportion atoms can vary (3) mixture because the proportion components is fixed (4) mixture because the proportion components can vary 5 The element sulfur is classified as a (1) metal (3) nonmetal (2) metalloid (4) noble gas 6 The elements in Group 2 have similar chemical properties because each atom of these elements has the same (1) atomic number (2) mass number (3) number of electron shells (4) number of valence electrons P.S./Chem. Jan. 14 of its of its of its of its 11 Which substance can not be broken down by a chemical change? (1) ammonia (3) ethane (2) arsenic (4) propanal [2] 12 Some physical properties of two samples of iodine-127 at two different temperatures are shown in the table below. Selected Physical Properties of Iodine-127 Samples at 1 atm Sample Sample Temperature (K) Description Density (g/cm3) 1 298 dark-gray crystals 4.933 2 525 dark-purple gas 0.006 These two samples are two different (1) mixtures (2) substances (3) phases of matter (4) isotopes of iodine 13 Powdered iron is magnetic, but powdered sulfur is not. What occurs when they form a mixture in a beaker at room temperature? (1) The iron retains its magnetic properties. (2) The iron loses its metallic properties. (3) The sulfur gains magnetic properties. (4) The sulfur gains metallic properties. 17 Two hydrogen atoms form a hydrogen molecule when (1) one atom loses a valence electron to the other atom (2) one atom shares four electrons with the other atom (3) the two atoms collide and both atoms gain energy (4) the two atoms collide with sufficient energy to form a bond 14 Which property is a measure of the average kinetic energy of the particles in a sample of matter? (1) mass (3) pressure (2) density (4) temperature 18 Which type of formula represents the simplest whole-number ratio of atoms of the elements in a compound? (1) molecular formula (3) empirical formula (2) condensed formula (4) structural formula 15 According to the kinetic molecular theory, which statement describes the particles of an ideal gas? (1) The gas particles are arranged in a regular pattern. (2) The force of attraction between the gas particles is strong. (3) The gas particles are hard spheres in continuous circular motion. (4) The collisions of the gas particles may result in the transfer of energy. 19 The coefficients in a balanced chemical equation represent (1) the mass ratios of the substances in the reaction (2) the mole ratios of the substances in the reaction (3) the total number of electrons in the reaction (4) the total number of elements in the reaction 16 The concentration of a solution can be expressed in (1) milliliters per minute (2) parts per million (3) grams per kelvin (4) joules per gram P.S./Chem. Jan. 14 20 Systems in nature tend to undergo changes toward (1) lower energy and higher entropy (2) lower energy and lower entropy (3) higher energy and higher entropy (4) higher energy and lower entropy [3] [OVER] 27 Which energy conversion must occur in an operating electrolytic cell? (1) electrical energy to chemical energy (2) electrical energy to nuclear energy (3) chemical energy to electrical energy (4) chemical energy to nuclear energy 21 Which formula represents an organic compound? (3) H2O2 (1) CaH2 (2) C4H8 (4) P2O5 22 Which class of organic compounds contains nitrogen? (1) aldehyde (3) amine (2) alcohol (4) ether 28 Which compound yields H ions as the only positive ions in an aqueous solution? (1) KOH (3) CH3OH (2) NaOH (4) CH3COOH 23 Which term identifies a type of organic reaction? (1) deposition (3) esterification (2) distillation (4) sublimation 29 Which statement describes the relative masses of two different particles? (1) A neutron has less mass than a positron. (2) A beta particle has less mass than a neutron. (3) An alpha particle has less mass than a positron. (4) An alpha particle has less mass than a beta particle. 24 Which compound is classified as a hydrocarbon? (1) butanal (3) 2-butanol (2) butyne (4) 2-butanone 25 In an oxidation-reduction reaction, the number of electrons lost is (1) equal to the number of electrons gained (2) equal to the number of protons gained (3) less than the number of electrons gained (4) less than the number of protons gained 30 Which term represents a type of nuclear reaction? (1) condensation (2) vaporization (3) single replacement (4) natural transmutation 26 Which substance is an electrolyte? (3) NaOH(s) (1) C6H12O6(s) (2) C2H5OH( ) (4) H2(g) P.S./Chem. Jan. 14 [4] Part B 1 Answer all questions in this part. Directions (31 50): For each statement or question, record on your 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 2011 Edition Reference Tables for Physical Setting/Chemistry. 31 Which ion has the smallest radius? (3) Se2 (1) O2 (2) S2 (4) Te2 35 When lithium reacts with bromine to form the compound LiBr, each lithium atom (1) gains one electron and becomes a negatively charged ion (2) gains three electrons and becomes a negatively charged ion (3) loses one electron and becomes a positively charged ion (4) loses three electrons and becomes a positively charged ion 32 Equal amounts of ethanol and water are mixed at room temperature and at 101.3 kPa. Which process is used to separate ethanol from the mixture? (1) distillation (3) filtration (2) reduction (4) ionization 36 A beaker with water and the surrounding air are all at 24 C. After ice cubes are placed in the water, heat is transferred from (1) the ice cubes to the air (2) the beaker to the air (3) the water to the ice cubes (4) the water to the beaker 33 A sample of a substance has these characteristics: melting point of 984 K hard, brittle solid at room temperature poor conductor of heat and electricity as a solid good conductor of electricity as a liquid or in an aqueous solution This sample is classified as (1) a metallic element (2) a radioactive element (3) a molecular compound (4) an ionic compound 37 A sample of chlorine gas is at 300. K and 1.00 atmosphere. At which temperature and pressure would the sample behave more like an ideal gas? (1) 0 K and 1.00 atm (2) 150. K and 0.50 atm (3) 273 K and 1.00 atm (4) 600. K and 0.50 atm 34 Given the balanced equation representing a reaction: N2 energy N N Which statement describes this reaction? (1) Bonds are broken, and the reaction endothermic. (2) Bonds are broken, and the reaction exothermic. (3) Bonds are formed, and the reaction endothermic. (4) Bonds are formed, and the reaction exothermic. P.S./Chem. Jan. 14 38 When a sample of a gas is heated in a sealed, rigid container from 200. K to 400. K, the pressure exerted by the gas is (1) decreased by a factor of 2 (2) increased by a factor of 2 (3) decreased by a factor of 200. (4) increased by a factor of 200. is is is is [5] [OVER] 39 The bright-line spectra produced by four elements are represented in the diagram below. Bright-Line Spectra of Four Elements Wavelength (nm) 750 700 650 750 700 650 600 550 500 450 400 600 550 500 Wavelength (nm) 450 400 Element A Element D Element X Element Z Given the bright-line spectrum of a mixture formed from two of these elements: 750 700 650 600 550 500 Wavelength (nm) 450 400 Which elements are present in this mixture? (1) A and D (3) Z and D (2) A and X (4) Z and X Temperature 40 The graph below represents the relationship between time and temperature as heat is added at a constant rate to a sample of a substance. A B Time During interval AB, which energy change occurs for the particles in this sample? (1) The potential energy of the particles increases. (2) The potential energy of the particles decreases. (3) The average kinetic energy of the particles increases. (4) The average kinetic energy of the particles decreases. P.S./Chem. Jan. 14 [6] 41 Given the potential energy diagram for a reversible chemical reaction: Potential Energy (kJ/mol) 46 What occurs at one of the electrodes in both an electrolytic cell and a voltaic cell? (1) Oxidation occurs as electrons are gained at the cathode. (2) Oxidation occurs as electrons are lost at the anode. (3) Reduction occurs as electrons are gained at the anode. (4) Reduction occurs as electrons are lost at the cathode. 47 Given the balanced equation representing a reaction: Reaction Coordinate H2O( ) HCl(g) H3O (aq) Cl (aq) Each interval on the axis labeled Potential Energy (kJ/mol) represents 10. kilojoules per mole. What is the activation energy of the forward reaction? (1) 10. kJ/mol (3) 40. kJ/mol (2) 30. kJ/mol (4) 60. kJ/mol According to one acid-base theory, the H2O( ) molecules (1) accept H ions (3) donate H ions (2) accept OH ions (4) donate OH ions 42 Which condensed structural formula represents an unsaturated compound? (1) CH3CHCHCH3 (3) CH3CH3 (2) CH3CH2CH3 (4) CH4 48 When an atom of the unstable isotope Na-24 decays, it becomes an atom of Mg-24 because the Na-24 atom spontaneously releases (1) an alpha particle (3) a neutron (2) a beta particle (4) a positron 43 Which element reacts spontaneously with 1.0 M HCl(aq) at room temperature? (1) copper (3) silver (2) gold (4) zinc 49 Which balanced equation represents nuclear fusion? 3 0 (1) 3 1 H 2 He 1 e 231 4 (2) 235 92U 90Th 2He 2 4 (3) 2 1H 1H 2He 1 90 143 1 (4) 235 92U 0n 38Sr 54Xe 3 0n 44 Given the balanced ionic equation: 3Pb2 (aq) 2Cr(s) 3Pb(s) 2Cr3 (aq) 50 Which reaction releases the greatest amount of energy per kilogram of reactants? What is the number of moles of electrons gained by 3.0 moles of lead ions? (1) 5.0 mol (3) 3.0 mol (2) 2.0 mol (4) 6.0 mol (1) (2) (3) (4) 45 What is the amount of heat energy released when 50.0 grams of water is cooled from 20.0 C to 10.0 C? (1) 5.00 102 J (3) 1.67 105 J (2) 2.09 103 J (4) 1.13 106 J P.S./Chem. Jan. 14 [7] 1n 0 141 92 1 235 92U 56Ba 36Kr 3 0n 2C H2 C2H2 C3H8(g) 5O2(g) 3CO2(g) 4H2O( ) NaOH(aq) HCl(aq) NaCl(aq) H2O( ) [OVER] Part B 2 Answer all questions in this part. Directions (51 65): Record your answers in the spaces provided in your answer booklet. Some questions may require the use of the 2011 Edition Reference Tables for Physical Setting/Chemistry. Base your answers to questions 51 through 54 on the information below and on your knowledge of chemistry. The diagram below represents three elements in Group 13 and three elements in Period 3 and their relative positions on the Periodic Table. Al Si P Ga In Some elements in the solid phase exist in different forms that vary in their physical properties. For example, at room temperature, red phosphorus has a density of 2.16 g/cm3 and white phosphorus has a density of 1.823 g/cm3. 51 Identify the element from the diagram that will react with chlorine to form a compound with the general formula XCl4. [1] 52 Consider the Period 3 elements in the diagram in order of increasing atomic number. State the trend in electronegativity for these elements. [1] 53 Compare the number of atoms per cubic centimeter in red phosphorus with the number of atoms per cubic centimeter in white phosphorus. [1] 54 Identify one element from the diagram that will combine with phosphorus in the same ratio of atoms as the ratio in aluminum phosphide. [1] P.S./Chem. Jan. 14 [8] Base your answers to questions 55 through 57 on the information below and on your knowledge of chemistry. The compounds KNO3 and NaNO3 are soluble in water. 55 Compare the entropy of 30. grams of solid KNO3 at 20. C with the entropy of 30. grams of KNO3 dissolved in 100. grams of water at 20. C. [1] 56 Explain why the total thermal energy of a sample containing 22.2 grams of NaNO3 dissolved in 200. grams of water at 20. C is greater than the total thermal energy of a sample containing 11.1 grams of NaNO3 dissolved in 100. grams of water at 20. C. [1] 57 Compare the boiling point of a NaNO3 solution at standard pressure to the boiling point of water at standard pressure. [1] Base your answers to questions 58 through 61 on the information below and on your knowledge of chemistry. Ethene and hydrogen can react at a faster rate in the presence of the catalyst platinum. The equation below represents a reaction between ethene and hydrogen. H C C H H + H H H H C C H H H H H 58 Determine the molar mass of the product. [1] 59 State the number of electrons shared between the carbon atoms in one molecule of the reactant ethene. [1] 60 Explain, in terms of activation energy, why the catalyzed reaction occurs at a faster rate. [1] 61 Explain why the reaction is classified as an addition reaction. [1] P.S./Chem. Jan. 14 [9] [OVER] Base your answers to questions 62 and 63 on the information below and on your knowledge of chemistry. In a titration, 50.0 milliliters of 0.026 M HCl(aq) is neutralized by 38.5 milliliters of KOH(aq). 62 In the space in your answer booklet, show a numerical setup for calculating the molarity of the KOH(aq). [1] 63 Complete the equation in your answer booklet for the neutralization by writing the formula of the missing product. [1] Base your answers to questions 64 and 65 on the information below and on your knowledge of chemistry. Table sugar, sucrose, is a combination of two simple sugars, glucose and fructose. The formulas below represent these simple sugars. O H H C H C OH HO C H H C H H H C OH C O HO C H OH H C OH C OH H C OH C OH H C OH H H Glucose Fructose 64 Identify the functional group that appears more than once in the fructose molecule. [1] 65 Explain, in terms of atoms and molecular structure, why glucose and fructose are isomers of each other. [1] P.S./Chem. Jan. 14 [10] Part C Answer all questions in this part. Directions (66 85): Record your answers in the spaces provided in your answer booklet. Some questions may require the use of the 2011 Edition Reference Tables for Physical Setting/Chemistry. Base your answers to questions 66 through 70 on the information below and on your knowledge of chemistry. Baking soda, NaHCO3, can be commercially produced during a series of chemical reactions called the Solvay process. In this process, NH3(aq), NaCl(aq), and other chemicals are used to produce NaHCO3(s) and NH4Cl(aq). To reduce production costs, NH3(aq) is recovered from NH4Cl(aq) through a different series of reactions. This series of reactions can be summarized by the overall reaction represented by the unbalanced equation below. NH4Cl(aq) CaO(s) NH3(aq) H2O( ) CaCl2(aq) 66 Write a chemical name for baking soda. [1] 67 Determine the percent composition by mass of carbon in baking soda (gram-formula mass 84 grams per mole). [1] 68 State the color of bromcresol green in a sample of NH3(aq). [1] 69 Determine the mass of NH4Cl that must be dissolved in 100. grams of H2O to produce a saturated solution at 70. C. [1] 70 Balance the equation in your answer booklet for the overall reaction used to recover NH3(aq), using the smallest whole-number coefficients. [1] P.S./Chem. Jan. 14 [11] [OVER] Base your answers to questions 71 through 75 on the information below and on your knowledge of chemistry. Rubbing alcohol is a product available at most pharmacies and supermarkets. One rubbing alcohol solution contains 2-propanol and water. The boiling point of 2-propanol is 82.3 C at standard pressure. 71 Explain, in terms of electronegativity differences, why a C a C H bond. [1] O bond is more polar than 72 Identify a strong intermolecular force of attraction between an alcohol molecule and a water molecule in the solution. [1] 73 Determine the vapor pressure of water at a temperature equal to the boiling point of the 2-propanol. [1] 74 Explain, in terms of charge distribution, why a molecule of the 2-propanol is a polar molecule. [1] 75 In the space in your answer booklet, draw a structural formula for the 2-propanol. [1] Base your answers to questions 76 and 77 on the information below and on your knowledge of chemistry. Silver-plated utensils were popular before stainless steel became widely used to make eating utensils. Silver tarnishes when it comes in contact with hydrogen sulfide, H2S, which is found in the air and in some foods. However, stainless steel does not tarnish when it comes in contact with hydrogen sulfide. 76 In the space in your answer booklet, draw a Lewis electron-dot diagram for the compound that tarnishes silver. [1] 77 In the ground state, an atom of which noble gas has the same electron configuration as the sulfide ion in Ag2S? [1] P.S./Chem. Jan. 14 [12] Base your answers to questions 78 through 81 on the information below and on your knowledge of chemistry. Common household bleach is an aqueous solution containing hypochlorite ions. A closed container of bleach is an equilibrium system represented by the equation below. Cl2(g) 2OH (aq) ClO (aq) Cl (aq) H2O( ) 78 Compare the rate of the forward reaction to the rate of the reverse reaction for this system. [1] 79 State the change in oxidation number for chlorine when the Cl2(g) changes to Cl (aq) during the forward reaction. [1] 80 Explain why the container must be closed to maintain equilibrium. [1] 81 State the effect on the concentration of the ClO ion when there is a decrease in the concentration of the OH ion. [1] Base your answers to questions 82 through 85 on the information below and on your knowledge of chemistry. Iodine has many isotopes, but only iodine-127 is stable and is found in nature. One radioactive iodine isotope, I-108, decays by alpha particle emission. Iodine-131 is also radioactive and has many important medical uses. 82 Determine the number of neutrons in an atom of I-127. [1] 83 Explain, in terms of protons and neutrons, why I-127 and I-131 are different isotopes of iodine. [1] 84 Complete the equation in your answer booklet for the nuclear decay of I-108. [1] 85 Determine the total time required for an 80.0-gram sample of I-131 to decay until only 1.25 grams of the sample remains unchanged. [1] P.S./Chem. Jan. 14 [13] P.S./CHEMISTRY Printed on Recycled Paper P.S./CHEMISTRY FOR TEACHERS ONLY The University of the State of New York REGENTS HIGH SCHOOL EXAMINATION P.S. CH PHYSICAL SETTING/CHEMISTRY Wednesday, January 29, 2014 1:15 to 4:15 p.m., only SCORING KEY AND RATING GUIDE Directions to the Teacher: Refer to the directions on page 2 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 at: http://www.p12.nysed.gov/assessment/ and select the link 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 A 1 .....1..... 9 .....1..... 17 . . . . . 4 . . . . . 25 . . . . . 1 . . . . . 2 .....3..... 10 . . . . . 4 . . . . . 18 . . . . . 3 . . . . . 26 . . . . . 3 . . . . . 3 .....2..... 11 . . . . . 2 . . . . . 19 . . . . . 2 . . . . . 27 . . . . . 1 . . . . . 4 .....1..... 12 . . . . . 3 . . . . . 20 . . . . . 1 . . . . . 28 . . . . . 4 . . . . . 5 .....3..... 13 . . . . . 1 . . . . . 21 . . . . . 2 . . . . . 29 . . . . . 2 . . . . . 6 .....4..... 14 . . . . . 4 . . . . . 22 . . . . . 3 . . . . . 30 . . . . . 4 . . . . . 7 .....2..... 15 . . . . . 4 . . . . . 23 . . . . . 3 . . . . . 8 .....3..... 16 . . . . . 2 . . . . .. 24 . . . . . 2 . . . . . Part B 1 31 . . . . . 1 . . . . . 36 . . . . . 3 . . . . . 41 . . . . . 3 . . . . . 46 . . . . . 2 . . . . . 32 . . . . . 1 . . . . . 37 . . . . . 4 . . . . . 42 . . . . . 1 . . . . . 47 . . . . . 1 . . . . . 33 . . . . . 4 . . . . . 38 . . . . . 2 . . . . . 43 . . . . . 4 . . . . . 48 . . . . . 2 . . . . . 34 . . . . . 1 . . . . . 39 . . . . . 1 . . . . . 44 . . . . . 4 . . . . . 49 . . . . . 3 . . . . . 35 . . . . . 3 . . . . . 40 . . . . . 1 . . . . . 45 . . . . . 2 . . . . . 50 . . . . . 1 . . . . . Directions to the Teacher Follow the procedures below for scoring student answer papers for the Regents Examination in Physical Setting/Chemistry. Additional information about scoring is provided in the publication Information Booklet for Scoring Regents Examinations in the Sciences. Do not attempt to correct the student s work by making insertions or changes of any kind. If the student s responses for the multiple-choice questions are being hand scored prior to being scanned, the scorer must be careful not to make any marks on the answer sheet except to record the scores in the designated score boxes. Marks elsewhere on the answer sheet will interfere with the accuracy of the scanning. Allow 1 credit for each correct response. At least two science teachers must participate in the scoring of the Part B 2 and Part C open-ended questions on a student s paper. 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 more than approximately one-half of the open-ended questions on a student s answer paper. Teachers may not score their own students answer papers. Students responses must be scored strictly according to the Scoring Key and Rating Guide. For openended 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. On the student s separate answer sheet, for each question, record the number of credits earned and the teacher s assigned rater/scorer letter. Fractional credit is not allowed. Only whole-number credit may be given for a response. If the student gives more than one answer to a question, only the first answer should be rated. Units need not be given when the wording of the questions allows such omissions. For hand scoring, raters should enter the scores earned in the appropriate boxes printed on the separate answer sheet. Next, the rater should add these scores and enter the total in the box labeled Total Raw Score. Then the student s raw score should be converted to a scale score by using the conversion chart that will be posted on the Department s web site at: http://www.p12.nysed.gov/assessment/ on Wednesday, January 29, 2014. The student s scale score should be entered in the box labeled Scale Score on the student s answer sheet. The scale score is the student s final examination score. Schools are not permitted to rescore any of the open-ended questions on this exam after each question has been rated once, regardless of the final exam score. Schools are required to ensure that the raw scores have been added correctly and that the resulting scale score has been determined accurately. Because scale scores corresponding to raw scores in the conversion chart may change from one administration 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. P.S./Chem. Rating Guide Jan. 14 [2] 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. Acceptable responses include, but are not limited to: Si silicon element 14 52 [1] Allow 1 credit. Acceptable responses include, but are not limited to: As atomic number increases, the electronegativity increases. Electronegativity increases. from lower to higher 53 [1] Allow 1 credit. Acceptable responses include, but are not limited to: White phosphorus has fewer atoms per cm3. Red has more. Note: Do not allow credit for a response that only indicates the number of atoms per cm3 in red phosphorus is different from the number of atoms per cm3 in white phosphorus. 54 [1] Allow 1 credit. Acceptable responses include, but are not limited to: Ga indium element 31 element 49 P.S./Chem. Rating Guide Jan. 14 [3] 55 [1] Allow 1 credit. Acceptable responses include, but are not limited to: The entropy of KNO3(s) is less than the entropy of KNO3(aq). The KNO3(aq) is more disordered. The solution is more random than the solid. Note: Do not allow credit for a response that only indicates the entropies are different. 56 [1] Allow 1 credit. Acceptable responses include, but are not limited to: Both samples are at 20. C, but the larger sample has more matter. The larger sample has twice as many particles. The total thermal energy is directly proportional to the masses of the samples. 57 [1] Allow 1 credit. Acceptable responses include, but are not limited to: The boiling point of the NaNO3 solution is higher than the boiling point of water. lower for H2O 58 [1] Allow 1 credit for 30 g/mol, 30. g/mol, or for any value from 30.06 g/mol to 30.1 g/mol, inclusive. 59 [1] Allow 1 credit for 4 or four. 60 [1] Allow 1 credit. Acceptable responses include, but are not limited to: The catalyzed reaction pathway has a lower activation energy than the original reaction. Less energy is needed. 61 [1] Allow 1 credit. Acceptable responses include, but are not limited to: Hydrogen atoms are added to the ethene molecule at the site of the carbon-carbon double bond to form a single molecule. Two reactants combine to form a single product. Two substances form one. Two hydrogen atoms are added at C C. An unsaturated reactant becomes a saturated product. The reaction is a hydrogenation reaction, which is a type of addition reaction. P.S./Chem. Rating Guide Jan. 14 [4] 62 [1] Allow 1 credit. Acceptable responses include, but are not limited to: (0.026 M)(50.0 mL) MB (38.5 mL) (0.026)(50) 38.5 63 [1] Allow 1 credit. Acceptable responses include, but are not limited to: KCl ClK K (aq) Cl (aq) K Cl 64 [1] Allow 1 credit. Acceptable responses include, but are not limited to: OH OH alcohol hydroxyl hydroxy group Note: Do not allow credit for hydroxide ion or hydroxyl radical or OH . 65 [1] Allow 1 credit. Acceptable responses include, but are not limited to: The number of each kind of atom is the same in both, but their structures are not the same. Their molecular formulas are the same, but their structural arrangement of atoms is different. same molecular formula but different structural formulas The only difference is the arrangement of the atoms. P.S./Chem. Rating Guide Jan. 14 [5] Part C Allow a total of 20 credits for this part. The student must answer all questions in this part. 66 [1] Allow 1 credit. Acceptable responses include, but are not limited to: sodium hydrogen carbonate sodium bicarbonate sodium acid carbonate monosodium carbonate bicarbonate of soda 67 [1] Allow 1 credit for 14% or for any value from 14.28% to 14.3%, inclusive. 68 [1] Allow 1 credit for blue. 69 [1] Allow 1 credit for any value from 61 g to 63 g, inclusive. 70 [1] Allow 1 credit for 2 NH4Cl CaO 2 NH3 H2O CaCl2. Note: Allow credit even if the coefficient 1 is written in front of CaO, H2O, and/or CaCl2. 71 [1] Allow 1 credit. Acceptable responses include, but are not limited to: There is a greater electronegativity difference in a C O bond than in a C H bond. The C O bond is more polar because the electronegativity difference for a C O bond is 0.8, and the electronegativity difference for a C H bond is 0.4. The C H bond has a smaller difference. The C O is .8 and the C H is .4. P.S./Chem. Rating Guide Jan. 14 [6] 72 [1] Allow 1 credit. Acceptable responses include, but are not limited to: hydrogen bonding dipole dipole 73 [1] Allow 1 credit for any value from 48 kPa to 52 kPa, inclusive. 74 [1] Allow 1 credit. Acceptable responses include, but are not limited to: A 2-propanol molecule is polar because it has an asymmetrical distribution of charge. The charge distribution is uneven. The center of positive charge and the center of negative charge do not coincide. 75 [1] Allow 1 credit. Examples of 1-credit responses: C H C C C H H H C C H OH H C C C H OH C O H C OH C 76 [1] Allow 1 credit. The position of electrons may vary. Examples of 1-credit responses: X S H X H S H H H S H P.S./Chem. Rating Guide Jan. 14 [7] 77 [1] Allow 1 credit. Acceptable responses include, but are not limited to: Ar argon element 18 78 [1] Allow 1 credit. Acceptable responses include, but are not limited to: The rate of the forward reaction is equal to the rate of the reverse reaction. They are the same. equal 79 [1] Allow 1 credit. Acceptable responses include, but are not limited to: 0 to 1 0 to 1 zero to negative one 0 to minus one 80 [1] Allow 1 credit. Acceptable responses include, but are not limited to: The container must be closed so that no matter can enter or leave, thus disturbing the equilibrium. If the container is open, Cl2 gas escapes. to keep the concentrations of the reactants and products constant 81 [1] Allow 1 credit. Acceptable responses include, but are not limited to: The concentration of the ClO ion decreases. [ClO ] decreases. lower ClO concentration less ClO P.S./Chem. Rating Guide Jan. 14 [8] 82 [1] Allow 1 credit for 74. 83 [1] Allow 1 credit. Acceptable responses include, but are not limited to: I-127 atoms and I-131 atoms have the same number of protons, but different numbers of neutrons. Both have 53 p, but I-127 has 74 n while I-131 has 78 n. They have the same atomic number but different mass numbers. same atomic number but different numbers of neutrons The only difference is the number of neutrons. 84 [1] Allow 1 credit. Acceptable responses include, but are not limited to: 104Sb 51 104Sb Sb-104 antimony-104 85 [1] Allow 1 credit for 48 d, 48.0 d, 48.1 d, or for any value from 48.12 d to 48.13 d, inclusive. P.S./Chem. Rating Guide Jan. 14 [9] Regents Examination in Physical Setting/Chemistry January 2014 Chart for Converting Total Test Raw Scores to Final Examination Scores (Scale Scores) The Chart for Determining the Final Examination Score for the January 2014 Regents Examination in Physical Setting/Chemistry will be posted on the Department s web site at: http://www.p12.nysed.gov/assessment/ on Wednesday, January 29, 2014. 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. Online Submission of 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 http://www.forms2.nysed.gov/emsc/osa/exameval/reexameval.cfm. 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. P.S./Chem. Rating Guide Jan. 14 [10] Map to Core Curriculum January 2014 Physical Setting/Chemistry Question Numbers Key Ideas/Performance Indicators Part A Standard 1 Part B Part C Math Key Idea 1 Math Key Idea 2 62 59 69, 73 69, 70, 71, 73 Math Key Idea 3 44, 45, 51, 58 67, 71, 79, 84, 85 Science Inquiry Key Idea 1 35, 40, 53, 55, 56, 57, 59, 60, 64, 65 72, 74, 75, 78, 80, 83 33, 34, 37, 39, 40, 47, 50, 51, 52, 54, 61, 63 66, 68, 70, 74, 77, 79, 82 Science Inquiry Key Idea 2 Science Inquiry Key Idea 3 Engineering Design Key Idea 1 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 36 38, 65 80, 81 40 Standard 7 Key Idea 1 Key Idea 2 Key Idea 3 Key Idea 4 Standard 4 Process Skills 31, 32, 35, 38, 39, 42, 43, 44, 46, 51, 52, 54, 58, 62, 63, 64 34, 40, 41, 45, 48, 49, 56 Key Idea 5 Key Idea 3 Key Idea 4 Key Idea 5 2011 Edition P.S./Chem. Rating Guide Jan. 14 68, 69, 70, 75, 78, 81, 82, 83 84, 85 76, 77 Standard 4 1, 2, 3, 4, 5, 6, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 14, 30 7, 8, 9 31, 32, 37, 38, 39, 42, 43, 44, 46, 47, 48, 51, 52, 54, 55, 57, 58, 60, 61, 62, 63, 64, 65 36, 40, 45, 49, 56 33, 34, 35, 41, 50, 53, 59 Reference Tables 1, 2, 3, 5, 6, 11, 31, 35, 38, 42, 43, 16, 21, 22, 23, 24, 45, 48, 50, 51, 52, 26, 28, 29 53, 54, 57, 58, 59, 62, 63, 64 [11] 66, 67, 68, 69, 70, 75, 78, 79, 80, 81, 82, 83 84, 85 71, 72, 73, 74, 76, 77 66, 67, 68, 69, 71, 73, 75, 76, 77, 82, 83, 84, 85

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