28) Which factors would decrease the rate of a reaction? I. Lowering the tempera

Question

28) Which factors would decrease the rate of a reaction? I. Lowering the temperature II. Increasing the concentration of reactants II. Adding a catalyst A) I only E) I and III C) III only D)I only B) and 111 29) A reaction that is spontaneous can be described as A) proceeding in both the forward and reverse directions. B) proceeding without external influence once it has begun. C) releasing heat to the surroundings. D) increasing in disorder. E) having the same rate in both the forward and reverse directions. 30) A process or reaction which takes in heat from the surroundings is said to be D) exothermic. E) endergonic. A) isothermal. B) conservative. C) endothermic. 31) The condensed structure of 2,4-dimethyl-heptane is A) CH3CH3CH2CH3CH2CH2 CH2CH3 B) CH3 CHCH2 CHCH2 CH2 CH3 CH3 CH3 C) CH3 CH3 CH3 CHCH2 CHCH2 CH2 CH3 CH3 CH3 D) CH3 CHCH2 CHCH2 CH3 CH3 CH3 E) CH3 CHCH2 CHCH2 CH2 CH2 CH3 CH3 CH3 32) Consider the reaction shown: N2 + O2 2 NO H= 43.2 kcal When 50.0 g of N2 react, kcal will be A)77.1; produced B) 2160; produced C) 77.1; consumed D) 43.2; produced E) 2160; consumed

Explanation / Answer

28.

decrease rate of reaction

- Lowering T decreseas K

then choose only I

29.

IF spontanous:

proceeds without external influence once it has started to the forward reaction

30.

if it takes heat, then it is ENDO thermic, choose C

31.

heptane chain = 7 carbons

in the 2nd and 4th carbon add CH3-

then choose B

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