Question

explain the characteristic features of changes in a chemical reaction with example​

Answer 1

Explanation:

suppose O2+2H2=2H2O

here oxygen is gas. and hydrogen is also..

but in change buy compound it made water that's liquid...

Answer 2

Explanation:

You put on your laboratory goggles and ready your pen to make observations but then stop: Is what you are seeing a physical change or a chemical change? It can be tricky to tell the difference between the two. Knowing some key indicators of a chemical change can be helpful both in the chemistry lab and in the real world

1)Changes in Temperature

2)Changes in Color

3)A Marked Odor

4)Formation of a Precipitate

5)Release of Bubbles