Which of the following was NOT one of the observations from the labs that indicated a chemical reaction was occurring?

Question

Which of the following was NOT one of the observations from the labs that indicated a chemical reaction was occurring?

a
bubbles
b
gas forming
c
color change
d
All of the above was observed signs of a chemical reaction

Answer 1

The correct answer is:

d) All of the above was observed signs of a chemical reaction

All the options listed (bubbles, gas forming, color change) are common observations that indicate a chemical reaction has occurred. Therefore, option d is the one that states they were all observed, so it does not indicate a lack of observation.