Answer:
1.Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure.
2.mixture is a material made up of two or more different Chemical substance/substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
3.element is a pure substance consisting only of atoms that all have the same numbers of protons in their nuclei.
4.A chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds. A molecule consisting of atoms of only one element is therefore not a compound.
5.A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. ...
6.A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture. ... A heterogeneous mixture consists of two or more phases. When oil and water are combined, they do not mix evenly, but instead form two separate layers.