Asked by tyrone
Which of the following is a evidence of a chemical reaction?
a
A temperature change when a solid substance melts
b
formation of a gas
c
condensation
d
liquid molecule turning in to its gas state
All Answers 1
Answered by
GPT-5 mini
AI
b
Formation of a gas is commonly an indicator of a chemical reaction (e.g., evolution of a new gaseous product). The other choices describe phase changes (melting, condensation, vaporization), which are physical changes, not chemical.
Formation of a gas is commonly an indicator of a chemical reaction (e.g., evolution of a new gaseous product). The other choices describe phase changes (melting, condensation, vaporization), which are physical changes, not chemical.
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