Question

What changes can be observed during chemical reaction​

Answer 1

Answer:

Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

Answer 2

Explanation:

• new substance is formed
• composition changes
• Energy change involved
• mass increase or decrease
• permanent
• irreversible