Chemical Physical Change Question Preview (ID: 36087)
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Approximately how many elements are known to scientist today
a) 10
b) 100
c) 1000
d) 1000000
Sodium is an explosive metal and Chlorine is a toxic gas. Why are they safe to eat when they combine to make salt?
a) When the atoms join, new atoms are made that are differnent than sodium and chlorine
b) When they become a solid, they are no longer dangerous
c) Salt is toxic and will explode if you not careful
d) The chemical reaction creates a new substance (salt) with new properties
A pot of water is heated over a flame until bubbles form. This is an example of a
a) chemical change
b) physical change
c) chemical reaction
d) catalyst
What happens to a substance during a physical change?
a) Molecules are broken and the elements are rearranged into new molecules
b) The molecules stay the same and their properties stay the same.
c) The molecules get smaller and the properties change
d) Molecules are destroyed and new molecules are formed
Two solutions are added together and the new solution becomes cold. This tells you that
a) A gas is being produced
b) Molecules are being broken apart
c) An exothermic reaction is taking place
d) An endothermic reaction is taking place
A change in size or shape but no new substance created
a) Physical Change
b) Chemical Change
c) Chemical Reaction
d) Catalyst
A change is a substance that results in the formation of a brand new substance with new properties
a) Physical change
b) Mixture
c) Catalyst
d) Chemical Change
The Law of Conservation of Mass says
a) A chemical change results in the formation of new elements after the reaction occurs
b) Matter is not created or destroyed in a chemical or physical change
c) After a chemical or physical change occurs, mass is lost
d) Matter can be created, but not destroyed during a chemical change
An Exothermic reaction is
a) A reaction that results in energy being absorbed. The reaction feels cold.
b) A reaction that results in new atoms being created
c) A reaction that results in a release of energy. Produces warmth
d) A reaction that results in existing atoms being destroyed
Which of the following is a chemical change
a) boiling water
b) dissolving sugar in water
c) a glow stick glowing
d) adding red food coloring to water
Which is NOT evidence of a chemical change
a) Fizzing
b) Color change
c) Aroma change
d) Bending
An example of an endothermic reaction would be
a) A cold pack for a sports injury
b) Hand warmers
c) Elephant Toothpaste reaction
d) Glow stick
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