1) An exothermic reaction may require some activation energy to start; the react

Question

1) An exothermic reaction may require some activation energy to start; the reaction then...                                                          A) needs more energy added, as exothermic reactions absorb energy.                                                                              B) does not need more energy added, as the binding energy replaces the activation energy.                                                                              C) becomes endothermic.                                                                              D) does not need more energy added, as the energy released by the exothermic reaction is sufficient                                                                                  2. The rate of a reaction can be increased by all of the following except                                                                                      A) increasing the concentration of the reactants.                                                                                              B) increasing the temperature.                                                                                                      C) increasing the surface area of the reactants.                                                                                                      D) adding a catalyst.                                                                                                      E) increasing the volume of the reaction vessel                                         A) needs more energy added, as exothermic reactions absorb energy.                                                                              B) does not need more energy added, as the binding energy replaces the activation energy.                                                                              C) becomes endothermic.                                                                              D) does not need more energy added, as the energy released by the exothermic reaction is sufficient                                                                                  2. The rate of a reaction can be increased by all of the following except                                                                                      A) increasing the concentration of the reactants.                                                                                              B) increasing the temperature.                                                                                                      C) increasing the surface area of the reactants.                                                                                                      D) adding a catalyst.                                                                                                      E) increasing the volume of the reaction vessel                                         A) needs more energy added, as exothermic reactions absorb energy.                                                                              B) does not need more energy added, as the binding energy replaces the activation energy.                                                                              C) becomes endothermic.                                                                              D) does not need more energy added, as the energy released by the exothermic reaction is sufficient                                                                                  2. The rate of a reaction can be increased by all of the following except                                                                                      A) increasing the concentration of the reactants.                                                                                              B) increasing the temperature.                                                                                                      C) increasing the surface area of the reactants.                                                                                                      D) adding a catalyst.                                                                                                      E) increasing the volume of the reaction vessel                                         A) needs more energy added, as exothermic reactions absorb energy.                                                                              B) does not need more energy added, as the binding energy replaces the activation energy.                                                                              C) becomes endothermic.                                                                              D) does not need more energy added, as the energy released by the exothermic reaction is sufficient                                                                                  2. The rate of a reaction can be increased by all of the following except                                                                                      A) increasing the concentration of the reactants.                                                                                              B) increasing the temperature.                                                                                                      C) increasing the surface area of the reactants.                                                                                                      D) adding a catalyst.                                                                                                      E) increasing the volume of the reaction vessel                                         A) needs more energy added, as exothermic reactions absorb energy.                                                                              A) needs more energy added, as exothermic reactions absorb energy.                                                                              A) needs more energy added, as exothermic reactions absorb energy.                                                                              B) does not need more energy added, as the binding energy replaces the activation energy.                                                                              B) does not need more energy added, as the binding energy replaces the activation energy.                                                                              B) does not need more energy added, as the binding energy replaces the activation energy.                                                                              C) becomes endothermic.                                                                              C) becomes endothermic.                                                                              C) becomes endothermic.                                                                              D) does not need more energy added, as the energy released by the exothermic reaction is sufficient                                                                                  2. The rate of a reaction can be increased by all of the following except                                                                                      A) increasing the concentration of the reactants.                                                                                              B) increasing the temperature.                                                                                                      C) increasing the surface area of the reactants.                                                                                                      D) adding a catalyst.                                                                                                      E) increasing the volume of the reaction vessel                                         D) does not need more energy added, as the energy released by the exothermic reaction is sufficient                                                                                  2. The rate of a reaction can be increased by all of the following except                                                                                      A) increasing the concentration of the reactants.                                                                                              B) increasing the temperature.                                                                                                      C) increasing the surface area of the reactants.                                                                                                      D) adding a catalyst.                                                                                                      E) increasing the volume of the reaction vessel                                         D) does not need more energy added, as the energy released by the exothermic reaction is sufficient                                                                                  2. The rate of a reaction can be increased by all of the following except                                                                                      A) increasing the concentration of the reactants.                                                                                              B) increasing the temperature.                                                                                                      C) increasing the surface area of the reactants.                                                                                                      D) adding a catalyst.                                                                                                      E) increasing the volume of the reaction vessel                                             2. The rate of a reaction can be increased by all of the following except                                                                                      A) increasing the concentration of the reactants.                                                                                              B) increasing the temperature.                                                                                                      C) increasing the surface area of the reactants.                                                                                                      D) adding a catalyst.                                                                                                      E) increasing the volume of the reaction vessel                                                     B) increasing the temperature.                                                                                                      C) increasing the surface area of the reactants.                                                                                                      D) adding a catalyst.                                                                                                      E) increasing the volume of the reaction vessel                                                     B) increasing the temperature.                                                                                                      C) increasing the surface area of the reactants.                                                                                                      D) adding a catalyst.                                                                                                      E) increasing the volume of the reaction vessel

Explanation / Answer

1. D

Ans. : It is because when the exothermic reaction intiates, it needs some energy, but when some % of the reaction is completed, the energy released by it acts as activation energy for the remaining reactants.

2. E

Ans: It is because increasing the volume of vessel leads to decrease in concentration of the reactants.

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