Answer:
D. chemical alters the atomic structure of a substance, while physical does not
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Answer:0.178 moles
Explanation: carbon trihydride seems to be an unusual name for the methyl group CH3–
ionic wt 15
moles = 2.67/15 = 0.178
Answer: option E. None because in all the reactions O2 is in excess
Explanation:
The atomic mass would not change since the mass of an electron is negligible compared to the mass of protons and neutrons