Question

Chemical changes can be used to __________ substances such as metals from their ores.

a) Preserve
b) Purify
c) Degrade
d) Solidify

Answer 1

Chemical changes can be used to purify substances such as metals from their ores.

Step-by-step explanation:

Chemical changes can be used to purify substances such as metals from their ores. When an element is extracted from its ore using chemical changes, impurities are removed to obtain a purer form of the substance.