We’re being asked to determine whether each change is physical or chemical.
Physical change → there is a change in a matter as it goes from one physical state to another.
Chemical change → atoms rearrange themselves to create a new substance.
Determine whether each change is physical or chemical.
(a) A copper wire is hammered flat.
(b) A nickel dissolves in acid to form a blue-green solution.
(c) Dry ice sublimes without melting.
(d) A match ignites when struck on a flint.
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What scientific concept do you need to know in order to solve this problem?
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