Question

what are the characteristics of a chemical change?

Answer 1

There is a change in color
There is a change in temperature: you can tell when the temperature is changing because when a chemical reaction is happening and bubbles start showing up. 
There is a change in the smell when two substances are mixed and a chemical reaction has occurred. 

Answer 2

1. it change chemically.
2. it changes the colour.
3. cannot be changed.
4. for example milk to curd in this the curd not changed to milk