Which of the following best summarizes what happens in a displacement reaction? A
Two elements react to form a compound.
B
A compound breaks down into elements.
C
An element and a compound react to form a different element and compound.
D
An element and a compound react to form another compound.

C

Explanation:

Here's an example of displacement reaction:

2 Al (s) + 3 CuSO4 (aq) -> 3 Cu (s) + Al2(SO4)3 (aq)

note that aluminium and copper are elements,

copper II sulphate and aluminium sulphate are compound

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

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