1. Why does an increase in the temperature increase the rate of a reaction?
A. reactant particles' speed is increased, so there are more collisions
B. reactant particles' speed is decreased, so molecules collide with less force
C. more molecules means more possible collisions
D. more molecules means better orientations for collisions
2. Metals are usually good ________ of electricity, and are generally wrapped in a(n) _________ like rubber or plastic when used in wiring for safety.
A. opposers, acceptor
B. conductors, insulator
C. acceptors, opposer
D. insulators, conductor
3. What is the goal of environmental regulations for industry?
A. to reduce the use of chemicals
B. to put an additional tax on products
C. to protect people and the environment
D. to eliminate controls on greenhouse gases
4. All of these gases can combine with moisture in the air to produce acid rain EXCEPT:
A. carbon oxides
B. sulfur oxides
C. silicon oxides
D. nitrogen oxides
C. silicon oxides
13. Why does an increase in the temperature increase the rate of a reaction?
A. reactant particles' speed is increased, so there are more collisions
B. reactant particles' speed is decreased, so molecules collide with less force
C. more molecules means more possible collisions
D. more molecules means better orientations for collisions
A. reactant particles' speed is increased, so there are more collisions
14. Metals are usually good ________ of electricity, and are generally wrapped in a(n) _________ like rubber or plastic when used in wiring for safety.
A. opposers, acceptor
B. conductors, insulator
C. acceptors, opposer
D. insulators, conductor
B. conductors, insulator
15. What is the goal of environmental regulations for industry?
A. to reduce the use of chemicals
B. to put an additional tax on products
C. to protect people and the environment
D. to eliminate controls on greenhouse gases
C. to protect people and the environment
For the equation shown below, use Le Chatelier's principle to identify if the changes indicated will cause the reaction to A) shift left B) shift right C) have no change or D) no way to predict a change.
2H2(g) + O2 (g) -> 2H2O (l) +heat
A. shift left B. shift right C. have no change D. no way to predict a change
17. adding oxygen (O2)
18. taking away hydrogen (H2)
19. reducing the temperature
17. A. shift left (the increase in oxygen will drive the reaction to use up the excess oxygen by producing more H2O, thus shifting the equilibrium towards the reactants)
18. A. shift left (removing hydrogen will cause the equilibrium to shift towards the reactants to try to replenish the lost H2)
19. A. shift right (reducing the temperature will cause the equilibrium to shift towards the products side (H2O) to produce more heat, according to Le Chatelier's principle)
20. The molar mass of elements, found on the periodic table, is measured in
A. moles
B. amus
C. grams
D. meters