January 2011 Chemistry Regents #21-30

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51-53 Questions 54-55 Questions 56-57 Questions 58-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-74 Questions 75-77 Questions 78-80 Questions 81-83

 

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AnswerExplanations
21 For a chemical reaction, the heat of reaction isequal to the
(1) potential energy of the reactants, only
(2) potential energy of the products, only
(3) potential energy of the products plus the potential energy of the reactants
(4) potential energy of the products minus the potential energy of the reactants		4heat of (products- reactants)
22 Given the equation representing a system at equilibrium:
2SO2(g) + O2(g) <==> 2SO3(g)
At equilibrium, the concentration of
(1) SO2(g) must equal the concentration of SO3(g)
(2) SO2(g) must be constant
(3) O2(g) must equal the concentration of SO2(g)
(4) O2(g) must be decreasing		2CON CON Requal

concentrations are constant

and rates are equal

23 The two isomers of butane have different
(1) formula masses       (3) molecular formulas
(2) empirical formulas   (4) structural formulas		4isomer same formula (mass) but different structure
24 An oxidation-reduction reaction involves the
(1) sharing of electrons
(2) sharing of protons
(3) transfer of electrons
(4) transfer of protons		3definition of redox
25 Which energy change occurs in an operating voltaic cell?
(1) chemical to electrical
(2) electrical to chemical
(3) chemical to nuclear
(4) nuclear to chemical		1voltaic is a battery

chemical to electrical

26 Which compound is an electrolyte?
(1) butene      (3) dimethyl ether
(2) propane   (4) methanoic acid		4acids are electrolytes
27 According to the Arrhenius theory, a base reacts with an acid to produce
(1) ammonia and methane
(2) ammonia and a salt
(3) water and methane
(4) water and a salt		4acid + base==> salt + water
28 What is one benefit associated with a nuclear fission reaction?
(1) The products are not radioactive.
(2) Stable isotopes are used as reactants.
(3) There is no chance of biological exposure.
(4) A large amount of energy is produced.		4energy
29 Which balanced equation represents a fusion reaction?

2fusion two small atoms combine to make a larger atom and energy
30 Which radioisotope emits alpha particles?
(1) Fe-53    (3) Au-198
(2) Sr-90     (4) Pu-239		4Table N

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51-53 Questions 54-55 Questions 56-57 Questions 58-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-74 Questions 75-77 Questions 78-80 Questions 81-83

 
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