January 2015 Chemistry Regents #21-25

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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

Question 51-53 Questions 54-55
 Questions 56-58 Questions 59-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-81 Questions 82-85

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21 Which mathematical expression represents the heat of reaction for a chemical reaction?

(1) (the heat of fusion) (the heat of vaporization)

(2) (the heat of vaporization) (the heat of fusion)

 (3) (the potential energy of the products) (the potential energy of the reactants)

(4) (the potential energy of the reactants) (the potential energy of the products)

3 links prod-react
22 At 101.3 kPa and 298 K, a 1.0-mole sample of which compound absorbs the greatest amount of heat as the entire sample dissolves in water?

(1) LiBr (3) NaOH

(2) NaCl (4) NH4Cl

4 links Bottom of Table I
23 For a reaction at equilibrium, which change can increase the rates of the forward and reverse reactions?

(1) a decrease in the concentration of the reactants

(2) a decrease in the surface area of the products

(3) an increase in the temperature of the system

(4) an increase in the activation energy of the forward reaction

3 links See link

 

24 Which reaction produces ethanol?

(1) combustion (3) fermentation

(2) esterification (4) polymerization

3 links definition
25 The chemical process in which electrons are gained by an atom or an ion is called

(1) addition (3) reduction

(2) oxidation (4) substitution

3 links GER-gain electrons reduction

 

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

Question 51-53 Questions 54-55
 Questions 56-58 Questions 59-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-81 Questions 82-85

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