1. During chemical reaction,
a. atoms are destroyed.
b. atoms are rearranged.
c. elements are destroyed.
d. new elements are produced.
2. A chemical reaction is a process in which
a. all reactants change state
b. products change into reactants
c. the law of conservation of mass applies
d. all of these
3. What determines an atom’s ability to undergo chemical reactions?
a. protons
b. neutrons
c. innermost electrons
d. outermost electrons
4. How is a chemical equation is balanced?
a. changing subscripts
b. erasing elements as necessary
c. adding coefficient
d. adding elements as necessary
5. What are the products in the equation below?
Zn + CuSO4-----> ZnSO4+ Cu
a. Zn and Cu
b. Zn and CuSO4
c. ZnSO4 and Cu
d. Zn only
6. Which of the following is the correct balanced reaction?
a. 2 C3H8+ 10O2 → 6CO2+ 8H2O
b. C3H8+ O2 → CO2+ H2O
c. C3H8+ O2 → 3CO2+ 2H2O
d. C3H8+ 5O2 → 3CO2+ 4H2O
7. Quicklime ( CaO ) is used as a drying agent. When water is added to this,
slaked lime Ca(OH)2 is formed. What type of reaction is this?
a. combination
b. single displacement
c. decomposition
d. double displacement
8. Fresh fish and meat that are not stored in a refrigerator show signs of spoilage in less than a day. What has caused this spoilage?
a. temperature changes
b. presence of microorganisms
c. oxygen in air
d. all of the above
9. The rate of reaction increases as the temperature increases. Which of the following statement provides the best explanation for this?
a. At lower temperatures the particles do not collide with each other.
b. At higher temperatures the particles have more energy, move faster, and collide more often.
c. Higher temperature has higher activation energy.
d. Increasing the temperature increases the number of particles, so they collide more often.
10. Which of the following statements about collisions is correct?
a. Reaction will occur even without collision of molecules.
b. All colliding particles have the same amount of energy.
c. Only fast-moving particles collide with each other.
d. Reactions can happen if the colliding particles have enough energy.
11. Reactions eventually stop. What is generally the reason for this?
a. The catalyst has been used up.
b. The particles have run out of energy.
c. One or more of the reactants has been used up.
d. Wrong catalyst was used.
12. In a reaction with hydrochloric acid, why does powdered magnesium reacts faster than the same mass of magnesium ribbon?
a. The powdered magnesium contains more atoms than the magnesium ribbon.
b. The powdered magnesium is hotter than the magnesium ribbon.
c. The powdered magnesium has a bigger surface area than the magnesium ribbon.
d. The powdered magnesium has a smaller surface area than the magnesium ribbon.
13. Marble reacts with hydrochloric acid to produce calcium chloride, water and carbon dioxide. In which of these mixtures is the rate of reaction likely to be the greatest?
a. 1 g of marble chips in 100 cm3 of hydrochloric acid at 20°C.
b. 1 g of powdered marble in 100 cm3 of hydrochloric acid at 30°C.
c. 1 g of powdered marble in 100 cm3 of hydrochloric acid at 20°C.
d. 1 g of marble chips in 100cm3 of hydrochloric acid at 30°C.
14. Manganese dioxide is a black powder that catalyzes the breakdown of hydrogen peroxide to water and oxygen. Which of the following statements is correct?
a. The mass of manganese dioxide will stay the same during the reaction.
b. The catalyzed reaction will produce more oxygen than the uncatalyzed reaction.
c. The particles in the catalyzed reaction will have more energy than in the uncatalyzed reaction.
d. Manganese dioxide will cause production of more water.
15. When oxygen is available, sulfur dioxide is produced from the burning of sulfur. Which of the following word equations best represents this reaction?
a. sulfur + oxygen ® sulfur dioxide
b. sulfur dioxide + oxygen ® sulfur
c. sulfur dioxide ® sulfur + oxygen
d. sulfur ® sulfur dioxide + oxygen
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