Question

if you are brainlest answer my any one question .
1.What are chemical changes? Give two examples.

2. What are irreversible changes? Give two examples.

3. Why is burning of paper an irreversible change?

4. What are physical changes? Give two examples.

5.What is the effect of heating and cooling on some materials?​

Answer 1

3. Answer: The burning of paper is an irreversible change. During burning of paper, the paper burns to produce ash and smoke.

Answer 2

Answer:

1 . Chemical changes are those chan in which the chemical bond of two or more atoms of elements break and recombine in diffr arrangements to form new substances

eg :- H2 + O2 ——>2H2O

Ca0 + H20 ———> Ca(OH)2

i will answer the rest if you mark me as brainliest ☺️