Matter can be classified into pure substances and mixtures.
Pure substances are substances that are made up of only one kind of atom or particle and have a fixed or constant structure.
So that means pure substances have chemical and physical properties that do not change.
Now to easily understand pure substances we’re going to focus on the definition that Pure substances are substances that are made up of only one kind of atom or particle.
There are 2 types of pure substances, we have Elements and compounds.
All elements are pure substances because they only have one type of atom.
While compounds are pure substances that have only one type of particle.

A mixture is made up of two or more different pure substances which are not chemically combined. So, therefore, A mixture is the physical combination of two or more substances. And because of that, substances in the mixture keep all their physical and chemical properties.

A homogeneous mixture is a mixture in which the components that make up the mixture are uniformly distributed throughout the mixture. That means the composition of the homogenous mixture is the same throughout and there is only one phase of matter observed. So, you wouldn't observe both a liquid and a gas or a liquid and a solid in a homogeneous mixture. Because the particles are evenly distributed.

On the other hand, a Heterogenous mixture is a mixture in which the components of the mixture are not uniform or not evenly distributed. Different samples from the mixture are not identical to each other. For example, Halo-halo is a heterogeneous mixture. Any given spoonful of halo-halo will contain varying amounts of different ingredients.

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