Evidence of Chemical Reactions Answers
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Which indicator most likely suggests that a chemical change is taking place?
A
change in sizeB
change of colorC
change of stateD
change in shape2
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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.3
Among these processes, which is the slowest chemical reaction?
A
digesting foodB
boiling an eggC
tarnishing of silverD
melting of a glacier4
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.5
The images show two unrelated events occurring at separate times. Which event is most likely an example of a chemical reaction?
A
Event 1 because there is a color change.B
Event 1 because there is a release of heat and light.C
Event 2 because the temperature is dropping in the liquid.D
Event 2 because the blue color mixes throughout the liquid.6
The chemical formula below shows how salt is produced.HCl + NaOH NaCl + H2O Which substances are the reactants?
A
HCl and NaClB
NaCl and H2OC
HCl and NaOHD
NaOH and H2ODid you find these answers helpful?
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