Which arrow represents the activation energy? What are the others? Is it endothermic or exothermic? F Multiple Choice iRespond Question A.) 1 Activation Energy B.) 2 PE Reactants C.) 3 PE Act. Complex E D.) 4 PE Products E.) 5 Heat of Reaction Endothermic

A chemical reaction between iron atoms and oxygen molecules can only occur if iRespond Question F Multiple Choice A.) the particles are heated B.) the atmospheric pressure decreases C.) there is a catalyst present D.) there are effective collisions between the particles E.)

Zn(s) + 2 HCl(aq)  ZnCl2(aq) + H2(g) The reaction rate can be increased by using 5.0 grams of powdered zinc instead of a 5.0-gram strip of zinc because the powdered zinc has iRespond Question F Multiple Choice A.) lower kinetic energy B.) lower concentration C.) more surface area D.) more zinc atoms E.)

Why does a higher concentration make a reaction faster? iRespond Question F Multiple Choice A.) There are more collisions per second only. B.) Collisions occur with greater energy only. C.) There are more collisions per second and the collisions are of greater energy. D.) There are more collisions per second or the collisions are of greater energy. E.)

Why does a higher temperature cause a reaction to go faster? iRespond Question F Multiple Choice A.) There are more collisions per second only. B.) Collisions occur with greater energy only. C.) There are more collisions per second and the collisions are of greater energy. D.) There are more collisions per second or the collisions are of greater energy. E.)

Why does a catalyst cause a reaction to proceed faster? iRespond Question F Multiple Choice A.) There are more collisions per second only. B.) The collisions occur with greater energy only. C.) The activation energy is lowered only. D.) There are more collisions per second and the collisions are of greater energy. E.)

What happens to a catalyst in a reaction? iRespond Question F Multiple Choice A.) It is unchanged. B.) It is incorporated into the products. C.) It is incorporated into the reactants. D.) It evaporates away. E.)

At equilibrium, what is the rate of production of reactants compared with the rate of production of products? iRespond Question F Multiple Choice A.) much higher B.) higher C.) the same D.) lower E.)

Which of the changes listed below would shift the following reaction to the right? 4HCl(g) + O2(g) ↔ 2Cl2(g) + 2H2O(g) iRespond Question F Multiple Choice A.) addition of Cl2 B.) removal of O2 C.) increase of pressure 5 gas ↔ 4 gas D.) decrease of pressure E.)

What is the effect of adding more water to the following equilibrium reaction? CO2 + H2O ↔ H2CO3 iRespond Question Multiple Choice F Shift right, causing an increase in product concentration A.) More H2CO3 is produced. B.) CO2 concentration increases. C.) The equilibrium is pushed in the direction of reactants. D.) There is no effect. E.)

In an endothermic reaction at equilibrium, what is the effect of raising the temperature? iRespond Question Multiple Choice F Increasing temperature favors the reaction that requires heat (endo) A.) The reaction makes more products. B.) The reaction makes more reactants. C.) The reaction is unchanged. D.) The answer cannot be determined E.)

What happens to a reaction at equilibrium when more reactant is added to the system? iRespond Question Multiple Choice F The system shift away from what you add A.) The reaction makes more products. B.) The reaction makes more reactants. C.) The reaction is unchanged. D.) The answer cannot be determined. E.)

In which of these systems is the entropy decreasing? iRespond Question F Multiple Choice A.) air escaping from a tire B.) snow melting C.) salt dissolving in water D.) a liquid cooling E.)

Which reaction results in the greatest increase in entropy? iRespond Question F Multiple Choice A.) A  B B.) A  2B More stuff, more disorder C.) 2A  B D.) 3A  B E.)

Which physical state of nitrogen has the highest entropy? iRespond Question F Multiple Choice A.) solid B.) liquid C.) gas D.) E.)

If a system is left to change spontaneously, in what state will it end? iRespond Question F Multiple Choice A.) the same state in which it began B.) the state with lowest possible energy C.) the state with the maximum disorder D.) the state with the lowest possible energy consistent with the state of maximum disorder E.)

Which of the following statements explains why the melting of ice is a spontaneous reaction at room temperature and pressure? iRespond Question F Multiple Choice A.) Melting is accompanied by a decrease of entropy. B.) Melting is accompanied by an increase of entropy. C.) Melting is accompanied by a decrease of energy. D.) Melting is accompanied by an increase of energy. E.)