Physical change is a change in its size, shape, phase, form, texture and appearance but it still remains the same material. Which describe a physical change?

Chemical change is a change in its color, smell or odor and the formation of bubbles. Which describe a chemical change?

Which is NOT an example of a chemical change?

Ash is a by-product of burning a paper. Why do you think so?

In cooking leche flan, which step shows a chemical change?

Metals, like iron, rust easily when exposed to chemicals. Why do iron rusts?It is because it reacts with in the air.

Chemical reaction occurs in chemical change. Which show an evidence of a chemical reaction?