Mixtures

Name the four (4) classes of matter.

1. mixtures

2. solutions

3. elements

4. compounds

What is a mixture?

- combination of two or more substances NOT chemically combined

What are four (4) characteristics of mixtures?

1. keep individual identity

2. no new substances formed

3. no fixed proportions

4. physically separated

Identify two (2) general types of mixtures.

1. heterogeneous

2. homogeneous

Explain the difference between heterogeneous and homogeneous.

Heterogeneous – different throughout

(least mixed, i.e. salad)

Homogeneous – same throughout

(well mixed, i.e. milk)

How are colloids and solutions similar and different?

(types of homogeneous mixtures)

Colloid – particles mixed, not dissolved

Solution – particles dissolved

What is a solution?

- homogeneous mixture formed when one substance dissolves in another

What is the difference between solute, solvent, and solubility?

Solute–IS dissolved

Solvent–DOES dissolving

Solubility–ABILITY to dissolve

What are decanting and filtering and how can they be used to separate mixtures?

Decanting – separating liquids and solids by pouring off the liquid

Filtering – separating liquids and solids by passing through a filter (semi-permeable membrane)