What is a physical change to a chemical change?

Answer 1

Water is, chemically, H2O whether it is in a solid , liquid, or gas state; it only has changed forms, not the actual element that it is. This is an example of physical change.

Chemically iron reacts with oxygen to form rust, which has merged the two elements and has created a reaction. This is an example of chemical change.

Answer 2

A physical change is one in which no chemical reaction has taken place, so the physical properties before the change are the same as they are after the change. Physical changes include phase changes and dissolving.

Answer 3

Answer

There are two possible definitions for Physical and Chemical changes which I use in school:

1. A physical change is reversible, a chemical change is not. For example, the freezing of water would be a physical change because it can be reversed, whereas the burning of wood is a chemical change - you can't 'unburn' it

2. A physical change is a change in which no new substance is formed; a chemical change results in the formation of one or more new substances. Again, consider the previous examples: Freezing water into ice just results in water molecules which are 'stuck' together - it's still H2O. Whereas burning wood results in ash, carbon dioxide, etc, all new substances which weren't there when you started.

Answer 4

A physical change involves a change in the appearance or phase of a substance without altering its chemical composition, such as melting ice into water. A chemical change involves a transformation at the molecular level resulting in the formation of new substances with different chemical properties, like when iron rusts.

Answer 5

an example of physical change would be tearing a paper up.

whereas a chemical change would be burning the paper.

Answer 6

A change for the state of matter can occur.