Question

properties can be observed only when substances are changing into different substances.
chemical
physical

check all of the following that are evidences of a chemical change (3 total correct answers)
change in color
change in shape
formation of a precipitate
evolution of gas

Explanation:

Chemical properties are observed when substances react and change into different substances. Evidence of a chemical change includes color change, formation of a precipitate, and evolution of gas. A change in shape is a physical change.

Answer:

First question: Chemical
Second question: Change in color, Formation of a precipitate, Evolution of gas