Which is most likely a physical change? cutting a substance into four pieces burning a substance into ash and smoke reacting a substance chemically to form a new substance combining a substance with water to make rust

Option (a) is the correct answer.

Explanation:

A physical change is a change in which there occurs no change in chemical composition of a substance.

Whereas when chemical composition of a substance changes then it is called chemical change.

For example, cutting a substance into four pieces is a physical change as there occurs no change in chemical composition of the substance.

If there is 8 g of a substance before a physical change, how much will there be afterwards?

0 g

4 g

8 g

16 g

Explanation:

A

thymine. in rna, thymine is replace by uracil