Question

2. With the help of an experiment, explain physical and chemical change.
3. What are expansion and contraction changes?​

Answer 1

Answer:

2.chemical changes take an iron nail and dip it in the water. the upper layer of the iron will be like a brown think called gung.this is called chemical changes . physical changes take an ice cube and heat it when it changes into water.in this change the material doesn't change his type of change called physical changes.

3. expansion means expanding or covering more area and contraction means shrinking or covering less and less space.

Explanation:

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