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Chemistry
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100
Molecules involved in a chemical reaction must meet to react. What is this concept called? a) entropy b) enthalpy c) collision theory d) reaction rate
What is c) collision theory
100
What happens to a catalyst as the result of a chemical reaction? a) It is consumed. b) It slows a chemical reaction. c) It changes to something else. d) It is not consumed.
What is d) It is not consumed.
100
A chemical reaction is at equilibrium. What will be the effect if more of the product is added? a) The reaction will shift to the left (toward the reactants). b) There will be no effect; the reaction will stay at equilibrium. c) The reaction will shift to the right (toward the products).
What is a) The reaction will shift to the left (toward the reactants).
200
Which of the following equations is used to describe reaction rates? a) ∆H T∆S b) ∆[reactant or product]/∆time c) Sproducts Sreactants d) pV = nRT
What is b) ∆[reactant or product]/∆time
200
What happens in a reaction if it is at chemical equilibrium? a) The amount of the reactant is constantly decreasing. b) All of the products are used up. c) There are no reactants in the system. d) The rate of the forward reaction equals the rate of the reverse reaction.
What is d) The rate of the forward reaction equals the rate of the reverse reaction.
200
Which of the following is likely to occur if more reactants are added to a reaction that is at chemical equilibrium? a) There will be no effect; the reaction will stay at equilibrium. b) The reaction will shift to the left (toward the reactants). c) The reaction will shift to the right (toward the products).
What is c) The reaction will shift to the right (toward the products).
300
What term refers to the difference between the energy of the transition state and the energy of the reactants? a) energy of entropy b) energy of enthalpy c) reaction rate energy d) activation energy
What is d) activation energy
300
What can you calculate if you know the concentration of a reaction's products and reactants, as well as the coefficients of each in the balanced equation? a) the rate of the reaction b) the entropy of the reaction c) the equilibrium constant d) Gibbs free energy
What is c) the equilibrium constant
300
Which of the following describes the effects of changes in concentration on a chemical system in equilibrium? a) Le Châtelier's principle b) Gibbs free energy c) Heisenberg uncertainty principle d) reaction rate
What is a) Le Châtelier's principle
400
Which of the following factors does not increase the rate of a reaction? a) increasing the concentration of the reactants b) decreasing the temperature of the system c) increasing the surface area of the reactants d) adding an effective catalyst to the system
What is b) decreasing the temperature of the system
400
What is the equation for the equilibrium constant for this equation? CO + 3H2 CH4 + H2O a) [CO][H2]3/[CH4][H2O] b) [CH4][H2O]/[CO][H2]3 c) [CH]4[H2O]/[H2]3 d) [H2O][H2]/[CH4][CO]
What is b) [CH4][H2O]/[CO][H2]3
400
Changes in which of the following do not shift the equilibrium of a chemical system? a) temperature b) time c) concentration d) pressure
What is b) time
500
Adding an inhibitor to a chemical reaction will have which of the following effects on the reaction? a) The inhibitor will increase the rate of the reaction. b) The inhibitor will initially increase the rate of the reaction and then decrease it. c) The inhibitor will decrease the rate of the reaction. d) The inhibitor will have no effect on the rate of the reaction.
What is c) The inhibitor will decrease the rate of the reaction.
500
What is the equilibrium expression for 2NO + Br2 2NOBr? a) [NOBr]2/[NO]2[Br2] b) [NOBr]2/[NO2][Br]2 c) [NO]2[Br2]/[NOBr]2 d) [NO2][Br]2/[NOBr2]
What is a) [NOBr]2/[NO]2[Br2]
500
Consider the reaction 2NaN3 2Na + 3N2, which is the first reaction that occurs when an air bag expands in a car undergoing a collision. This reaction happens very quickly, as you might suspect. A graph showing the amount of nitrogen gas (N2) could be best described as which of the following? a) The graph line's general trend is absolutely horizontal. b) The graph line's general trend is increasing from left to right. c) The graph line's general trend is decreasing from left to right. d) The graph line's general trend is nearly horizontal.
What is b) The graph line's general trend is increasing from left to right.