What do element compound and mixture mean?

Answer 1

An element is a pure substance

A compound is two or more pure substances joined together chemically, such that they can not be separated physically - a new substance.

A mixture is two or more substances that are mixed up but not joined together, such that they can be separated physically.

There is also the a "solution" which is like a mixture but where the mixing is happening at a molecular level, it is possible to separate the components physically, but not easily.

Answer 2

An element is a pure substance made up of only one type of atom, such as oxygen or gold. A compound is a substance made of two or more different types of atoms chemically bonded together, like water (H2O) or carbon dioxide (CO2). A mixture is a physical combination of two or more substances that are not chemically bonded, like a salad or salt water.

Answer 3

Homogeneous mixture means the combination of genes is only one kind of gene where as heterogeneous means the combination has two different kinds.