Explain how different states of matter are distinguished from each other and how pure substance distinguish from mixtures

Hello

The difference between the states of matter is explained as follows:

- a solid has a definite shape and a definite volume

- a liquid has a definite volume, but its shape changes depending on its container

- a gas does not have neither a definite volume nor a definite shape: both change depending on the container. In fact, a gas expands until it occupies the whole volume available.

The difference between a pure substance and a mixture is:

- a pure substance has a precise and definite chemical composition

- a mixture, instead, is a combination of two or more substances.