9. which substance cannot be decomposed by a chemical change?
A. ammonia
B. aluminum
C. methane
D. methanol
10. a chemical formula is an expression used to represent _________.
A. Mixture only
B. element only
C. Compound only
D. elements and compounds
A. ammonia
B. aluminum
C. methane
D. methanol
10. a chemical formula is an expression used to represent _________.
A. Mixture only
B. element only
C. Compound only
D. elements and compounds
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Answer:
A
Explanation:
Elements and compounds