Physical Science --- Chapter 6
Chapter 6 Chemical Reactions.
- 1.A synthesis reaction is a reaction between at least two compounds in which
- A.
A compound is decomposed by an electric current.
- B.
One breaks down into at least two products.
- C.
A compound burns in the presence of oxygen.
- D.
A new, more complex compound is formed.
- 2.Which statement about endothermic reactions is correct?
- A.
Energy is always created in the form of heat.
- B.
Energy is transferred from the surroundings to the reactants.
- C.
Energy is transferred from the reactants to the surroundings.
- D.
Energy is used to force electrons to move to higher energy levels.
- 3.A change in color, such as rusting of metal, is a sign that
- A.
A chemical change is taking place.
- B.
A physical change has just occurred.
- C.
Organic chemicals are present.
- D.
Oxygen is present.
- 4.When water is broken down by electrolysis, the products are
- A.
Water and carbon dioxide
- B.
Hydrogen and oxygen ions
- C.
Hydrogen gas and oxygen gas
- D.
Oxygen and methane
- 5.All of the following factors may speed up a chemical reaction except
- A.
Smaller surface area
- B.
Higher pressure
- C.
Higher temperature
- D.
Presence of a catalyst
- 6.What happens in a chemical reaction?
- A.
Atoms are destroyed.
- B.
Atoms are created.
- C.
Atoms are heated and cooled.
- D.
Atoms are rearranged.
- 7.A substance that undergoes a change in a chemical reaction is
- A.
A product.
- B.
A chemical.
- C.
A reactant.
- D.
An enzyme.
- 8.In a balanced chemical reaction, the total mass of the products always equals the
- A.
Atomic mass of the reactants.
- B.
Proportional masses of the reactants.
- C.
Molar mass of the reactants.
- D.
Total mass of the reactants.
- 9.The product of the synthesis reaction between sodium and chlorine gas is
- A.
Carbon dioxide.
- B.
Polyethylene.
- C.
Sodium chloride.
- D.
Copper (II) chloride.
- 10.In an exothermic reaction, energy is transferred from
- A.
The surroundings to the reactants.
- B.
One reactant to another.
- C.
The container to the chemicals.
- D.
The reactants to the surroundings
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