Which of the observation will not help to determine a chemical reaction ?
1) Change in size.
2) Evolution of a gas
3) Change in temperature
4) Change in colour
Answers
Answered by
3
Answer:
Change in size
Explanation:
Change in size is a physical reaction, so therefore that is not what should be on this list. Evolution of gas is chemical reaction. Change in temp is chemical. Change in color is definitely a chemical reaction, for example when iron rusts, it changes color. To elaborate, in rusting the Iron ore make a chemical reaction with the oxygen in the presence of water and environmental or atmospheric moisture to produce an Iron oxide. Iron oxide is otherwise called as rust.
Answered by
2
Answer:
Change in size
Explanation:
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