Mixtures

What are mixtures?

A mixture is a combination of two or more substances that are combined physically but not chemically, they form a mixture if they do not change chemically to form a new substance. Unlike elements and compunds, mixtures are not pure substances, because they contain more than one type of substance. Each substance in a mixture has the same chemical makeup it had before the mixture formed.  Unlike pure substances , they do not have definite properties because they don't have a defined chemical makeup. 

How can mixtures be classified?

• Heterogeneous: mixture that does not have a uniform composition. In other tupes of mixtures, the sustances are evenly spread throughout.
• Homegenous: susbtances that have a uniform composition.

As suspensions: suspensions are mixtures in which the particles of a material are spread throughout a liquid or gas but are too large to stay mixed without being stirred or shaken.

As solutions: In a solutions, one substance is dissolved in another substance.

As colloids: colloids are a third type of mixture that falls somewhere between suspensions and solutions. As in a suspension, the particles in a colloid are spreand throughout a liquid or a gas. Unlike the particles in a suspension, colloid particles are small and do not settle out quickly.