Name___________________________________
Physical Science Classwork 03/29/17
CHEMICAL REACTIONS, ENERGY, AND REACTION RATES - P. 594
PS.12, 17, 3, 4, 16, 26
1) If the specific type of energy needed for a chemical reaction to take place is heat, the reaction is____.
A) reactant
B) balanced
C) endothermic
D) exothermic
1)
2) What happens as water mixes with ammonium nitrate in a cold pack?
____________________________________________________________________________________________
3) Explain the difference between an exothermic reaction and an endothermic reaction.
Exothermic: _________________________________________________________________________________
Endothermic: ________________________________________________________________________________
REACTION RATES AND EQUILIBRIUM - P. 598
4) The rate at which reactants change into products is called the _________________________________.
5) Why does a higher temperature cause a reaction to go faster?
A) There are fewer collisions per second only.
B) There are more collisions per second and the collisions are of greater energy.
C) Collisions occur with greater energy only.
D) There are more collisions per second only.
5)
6) The rate of a chemical reaction normally _____.
A) is slowed down by a catalyst
B) decreases as reactant concentration increases
C) increases as reactant concentration increases
D) decreases as temperature increases
6)
7) Why does a higher concentration make a reaction faster?
A) There are more collisions per second and the collisions are of greater energy.
B) There are more collisions per second only.
C) Collisions occur with greater energy.
7)
8) Why does a small particle size generally cause a reaction to proceed faster?
A) There are fewer collisions per second only.
B) There are more collisions per second only.
C) There are more collisions per second and the collisions are of greater energy.
D) The collisions occur with greater energy.
8)
9) A catalyst is _____.
A) one of the reactants in single-replacement reactions
B) not used up in a reaction
C) the product of a combustion reaction
D) a solid product of a reaction
9)
10) Why does a catalyst cause a reaction to proceed faster?
A) The activation energy is lowered only.
B) There are more collisions per second only.
C) There are more collisions per second and the collisions are of greater energy.
D) The collisions occur with greater energy only.
10)
11) Which of the following substances act as catalysts in the body?
A) carbon dioxide
B) carbohydrates
D) water
E) enzymes
C) lipids
F) nucleic acids
11)
12) A catalyst works by _____.
A) shifting the equilibrium position toward the products
B) lowering the activation energy barrier
C) changing the temperature of the reactants
D) changing the particle size of the reactants
12)
13) If a catalyst is used in a reaction _____.
A) different reaction products are obtained
C) the energy of activation increases
13)
B) the reaction rate increases
D) the reaction rate does not change
14) If sulfur dioxide and oxygen can be made into sulfur trioxide, what is the reverse reaction?
A) SO3 + O2 SO5
B) SO2 + 2SO 3 3S + 4O2
C) 2SO2 + O2 2SO3
D) 2SO3 2SO 2 + O2
14)
15) If a reaction is reversible, what are the relative amounts of reactant and product at the end of the
reaction?
A) some product; some reactant
B) no reactant; all product
C) no reactant; no product
D) no product; all reactant
15)
16) At equilibrium, what is the rate of production of reactants compared with the rate of products?
A) the same
B) much higher
C) lower
D) higher
E) unpredictable
F) much lower
16)
17) What happens to a reaction at equilibrium when a product is removed from the reaction system?
A) The reaction makes more products.
B) The reaction is unchanged.
C) The reaction makes more reactants.
D) The reaction makes less products.
17)
18) What happens to a reaction at equilibrium when more reactant is added to the system?
A) The reaction makes more products.
B) The reaction is unchanged.
C) The reaction makes more reactants.
D) The reaction makes less products.
18)
19) In an endothermic reaction at equilibrium, what is the effect of raising the temperature?
A) The reaction makes more reactants.
B) The reaction makes more products.
C) The reaction is unchanged.
D) The reaction makes less products.
19)
20) In an endothermic reaction at equilibrium, what is the effect of lowering the temperature?
A) The reaction makes more products.
B) The reaction makes more reactants.
C) The reaction is unchanged.
D) The reaction makes less products.
20)
21) In an exothermic reaction at equilibrium, what is the effect of lowering the temperature?
A) The reaction makes more reactants.
B) The reaction is unchanged.
C) The reaction makes less products.
D) The reaction makes more products.
21)
22) In an exothermic reaction at equilibrium, what is the effect of raising the temperature?
A) The reaction is unchanged.
B) The reaction makes more products.
C) The reaction makes less products.
D) The reaction makes more reactants.
22)