Chapter 5: Chemical Reactions
Study Guide
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Class:
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Chapter 5.1 Observing Chemical Change
1) Chemistry is the study of
2) What is the primary difference between a physical change of matter and a chemical
change of matter?
3) What is the only sure evidence that a chemical reaction has occurred?
4) In an exothermic reaction, compare the energy required to break the bonds of the
reactants to the energy released as the products form.
Energy Needed to Break Reactant Bonds > < = Energy Released by the Formation of the Products
5) In an endothermic reaction, compare the energy required to break the bonds of the
reactants to the energy released as the products form.
Energy Needed to Break Reactant Bonds > < = Energy Released by the Formation of the Products
6) In a chemical equation, which side has the reactants?
products?
Chapter 5.2 Describing Chemical Reactions
7) What does a chemical formula indicate?
8) What does a chemical equation indicate?
9) What is the ratio of hydrogen to oxygen in the equation: 2 H2O2  2 H2O + O2
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10) What is the ratio of sulfer to oxygen in the equation: SO2 + + O2  SO3
11) In the above sulur-oxygen equation, which are elments and which are compounds?
12) Define the law of conservation of mass.
13) Why is it important to consider this law when writing a chemical equation?
14) Define an open system?
15) Does the law of conservatin of mass apply to reactions in a closed system?
16) Define a closed system?
17) Does the law of conservatin of mass apply to reactions in a closed system?
18) What is the difference between synthesis and decomposition?
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Ch. 5.3 Controlling Chemical Reactions
19) What is activation energy?
20) What is an inhibitor?
21) What is a catalyst?
22) What is one way to supply activation energy to begin a chemical reaction?
23) What type of reaction is 2H2O2  2H2O + O2 (the experiment conducted in class)?
24) What are four factors that can affect the rate of a chemical reaction.
25) Define surface area:
26) Define concentration.
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