Evidence of Chemical Reactions Answers
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A piece of limestone erodes due to acid rain. This process can be best described as a
A
slow chemical change.B
rapid chemical change.C
slow physical change.D
rapid physical change.2
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Which term best describes the role of hydrogen gas in the formation of a water molecule?
A
catalystB
inhibitorC
productD
reactant3
Two different liquids are mixed together. Which observation indicates that an exothermic chemical reaction has taken place?
A
an increase in volumeB
a decrease in volumeC
a rise in temperatureD
a drop in temperature4
The images show two processes. Image A: a roasting marshmallow Image B: melting iceWhich statement about the two images is true?
A
Image A shows a physical change, and image B shows a chemical reaction.B
Image A shows a chemical reaction, and image B shows a physical change.C
Both images show chemical reactions that are endothermic.D
Both images show chemical reactions that are exothermic.5
Which is the most important question for deciding if a chemical reaction has occurred?
A
Was there a change in the size?B
Was any heat energy given off?C
What is the density of the substance?D
What is the texture of the substance?6
Which statement about a chemical reaction is true?
A
It occurs only at low temperatures.B
It occurs only at high temperatures.C
It occurs whenever a physical change takes place.D
It occurs whenever a chemical change takes place.7
Burning a piece of wood in fire can be best described as a
A
chemical change because the atoms in wood change their state.B
physical change because the atoms in wood are turned into a gaseous product.C
chemical change because the atoms in wood and oxygen are rearranged.D
physical change because the atoms in wood are turned into black ash.8
Which indicator most likely suggests that a chemical change is taking place?
A
change in sizeB
change of colorC
change of stateD
change in shapeDid you find these answers helpful?
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