Speech on differences between Physical Change and Chemical Change? with examples?

Answer 1

There are two possible definitions for Physical and Chemical changes :

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 2

A chemical change cannot be undone, example baking a cake. A physical change can be undone, for instance melting ice to produce water. You can take it from here.

Answer 3

1.In Physical change only the physical properties get changed.
2.In Chemical change substance s chemical properties get changed.

Answer 4

chemical change: when chlorine bonds with sodium and becomes chloride, it gains an electron, a ion, and chemical change.
when an electron goes through, atomic decay, it loses a proton, and thus goes through a "physical"change. also, when elements, are either heated, melted, or evaporated, where they change physical form, but remain the same element, thus matter.

Answer 5

PHYSICAL CHANGE
something which we can really see touch and feel.
eg:changing of water into ice
CHEMICAL CHANGE
something which occures withen the internal molecules.
eg:one mole of hydrogen sulphide added with one mole of bromine gives to moles of hydrogen bromide and one mole of sulphur