Chemistry Concepts and Applications

Section 1: Energy Changes in Chemical Reactions

Self Check Quizzes

1
Which reaction is endothermic?

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A)Water forms as hydrogen and oxygen react.
B)Wood burns.
C)Water is broken into hydrogen and oxygen through electrolysis.
D)Methane and oxygen produce carbon dioxide and water vapor in a laboratory bunsen burner.
2
The decomposition of water __________.
A)occurs spontaneously
B)requires an activation energy
C)releases a net amount of energy
D)is exothermic
3
An exothermic reaction is one that __________.
A)absorbs heat
B)neither releases nor absorbs heat
C)produces smoke
D)releases heat
4
The energy released or absorbed by a chemical reaction is symbolized __________.
A)ΔHreaction
B)Hreactants
C)Hreactants + Hproducts
D)Hproducts
5
An exothermic reaction has a __________ ΔH.
A)high
B)negative
C)positive
D)zero
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