this topic is all about pysical science

1. Physical Science

2. Physical change
 Is a change in the physical property of a substance without altering its
composition and internal structure.

3. Chemical changes
 The properties of the initial material are completely different from the substance.

4. Chemical reaction
 Is a process though which one or more substance are changed into different
substance.

5. Chemical kinetics
 Is the branch of chemistry that studies reaction rate and factors affecting rates.