If there is 8g substance before a physical change, how much will be afterwards?
0g
4g
8g
16g

8g

Explanation:

The law of conservation of mass explains that the mass of substances before a physical change is the same as the mass after the change i.e mass is always conserved in nature.

Hence, the physical change will convert 8 grams of the reacting substance to 8 grams of products as well.

For instance:

Consider a change: A --> C

Once the mass of "A" is 8g, "C" the product of the physical change will also have a mass of 8g.

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."