August 2016 Chemistry Regents #21-25

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21 What occurs when a reaction reaches equilibrium?

(1) The concentration of the reactants increases.

(2) The concentration of the products increases.

(3) The rate of the forward reaction is equal to the rate of the reverse reaction.

(4) The rate of the forward reaction is slower than the rate of the reverse reaction.

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22 In terms of potential energy, PE, which expression defines the heat of reaction for a chemical change?

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23 Systems in nature tend to undergo changes that result in

(1) lower energy and lower entropy

(2) lower energy and higher entropy

(3) higher energy and lower entropy

(4) higher energy and higher entropy

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24 What occurs when Cr3+ ions are reduced to Cr2+ions?

(1) Electrons are lost and the oxidation number of chromium increases.

(2) Electrons are lost and the oxidation number of chromium decreases.

(3) Electrons are gained and the oxidation number of chromium increases.

(4) Electrons are gained and the oxidation number of chromium decreases.

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25 Where do reduction and oxidation occur in an electrolytic cell?

(1) Both occur at the anode.

(2) Both occur at the cathode.

(3) Reduction occurs at the anode, and oxidation occurs at the cathode.

(4) Reduction occurs at the cathode, and oxidation occurs at the anode.

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Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-54 Questions 55-57 Questions 58-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-74  Questions 75-76  Questions 77-78  Questions 79-80  Questions 81-82  Questions 83-85

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