A solid that forms and separates from a liquid mixture is a chemical change.
Answer:
C) Highly reactive
Explanation:
An atom with one or two valence electrons more than a closed shell is highly reactive, because the extra valence electrons are easily removed to form a positive ion
Acid + alkali ------> salt + water
2KOH + H2SO4 ------> K2SO4 + 2H2O
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