Page 499 - Chemistry eBook

may require the use of the Reference Tables for Physical Setting/Chemistry.
Sample Regents Questions
Part C
Part C
Answer all questions in this part.
Directions (66–83): Record your answers in the spaces provided in your answer booklet. Some questions may Dreiqruecirtieonthse(6u6s–e8o3f):thReeRcoerfdereynoucer TanabswleesrfsoirnPthyesiscpaalcSeesttpirnogv/iCdhedeministyroyu.r answer booklet. Some questions
Answer all questions in this part.
Base your answers to questions 66 through 68 on the information below. Base your answers to questions 66 through 68 on the information below.
In the early 1800s, John Dalton proposed an atomic theory that was based on
66 Explain, in terms of particles, why statement A is no longer accepted. [1] 66 Explain, in terms of particles, why statement A is no longer accepted. [1]
68 Explain, in terms of particles in the atoms of an element, why statement C is false. [1]
expeIrnimethnetaleaorblyser1v8a0t0iosn, sJomhandeDbayltosneveprraolpsocsiedntiasnts. aTtohmreice cthoneoceryptsthoaft Dwalstobna’sseadtomonic thexepoeryrimarensttaalteodbsbeervloawti.ons made by several scientists. Three concepts of Dalton’s atomic
theory are stated below.
Statement A: Atoms are indivisible and cannot be destroyed or broken down into smaller
Statement A: pAatrotms.s are indivisible and cannot be destroyed or broken down into smaller parts.
Statement B: Atoms of one element cannot be changed into atoms of another element. Statement B: Atoms of one element cannot be changed into atoms of another element.
Statement C: All atoms of one element have the same mass. Statement C: All atoms of one element have the same mass.
67 The decay of N-16 is represented by the balanced equation below. 67 The decay of N-16 is represented by the balanced equation below.
16N→ 0e+16O 176N → −01e + 168O 7 −1 8
State evidence that indicates statement B is not always true. [1] State evidence that indicates statement B is not always true. [1]
68 Explain, in terms of particles in the atoms of an element, why statement C is false. [1]
Jan 2011 #67, 68
Base your answers to questions 69 through 71 on the information below. Base your answers to questions 69 through 71 on the information below.
A tablet of one antacid contains citric acid, H3C6H5O7, and sodium hydrogen A tablet of one antacid contains citric acid, H3C6H5O7, and sodium hydrogen carbonate, NaHCO3. When the tablet dissolves in water, bubbles of CO2 are produced. This carbonate, NaHCO3. When the tablet dissolves in water, bubbles of CO2 are produced. This
reaction is represented by the incomplete equation below.
reaction is represented by the incomplete equation below.
H3C6H5O7(aq) + 3NaHCO3(aq) → Na3C6H5O7(aq) + 3CO2(g) + 3 _______ (l) H3C6H5O7(aq) + 3NaHCO3(aq) → Na3C6H5O7(aq) + 3CO2(g) + 3 _______ (l)
69 Complete the equation in your answer booklet by writing the formula of the missing 69 Complete the equation in your answer booklet by writing the formula of the missing
product. [1] product. [1]
Answer
70 State evidence that a chemical reaction occurred when the tablet was placed in the 70 State evidence that a chemical reaction occurred when the tablet was placed in the
water. [1] water. [1]
71 Determine the total number of moles of sodium hydrogen carbonate that will 71 Determine the total number of moles of sodium hydrogen carbonate that will
completely react with 0.010 mole of citric acid. [1] completely react with 0.010 mole of citric acid. [1]
67) Answer: The atom nitrogen-16 changed to oxygen-16.
In relation to nuclear chemistry, the word ‘particle’ refers to alpha, beta, or gamma particles. It does not referring to elements, atoms, or compounds.
PS/Chem.–Jan. ’11 [12] PS/Chem.–Jan. ’11 [12]
-OR-
In radioactive decay, the element changes into another element.
68) Isotopes have the same atomic number, but different number of neurons/different masses.
UNIT 12: NUCLEAR CHEMISTRY © 498