Which of the following is not evidence of a chemical reaction?

Question

(a.) a color change

(b.) a temperature decrease

(c.) a new smell

(d.) a change in appearance only

Answer 1

(a.) a color change - IS evidence of a chemical reaction

(b.) a temperature decrease - IS evidence

(c.) a new smell - Is evidence

(d.) a change in appearance only - IS NOT evidence (think about liquid water and solid water, ice)