Matter Chapter 3 Mixtures Elements and Compounds Classifying

Matter Chapter 3 Mixtures, Elements, and Compounds

Classifying Matter • • Mixtures Solutions Elements Compounds

Mixtures • When two or more substances are mixed together. • The substances that make up a mixture can be in any amount. • Not chemically combined. • No new chemical substances have been formed. • Physical properties make it possible to separate mixtures. No chemical reactions are involved.

Mixtures are classified according to how “well mixed” they are.

Heterogeneous Mixtures • A mixture that does not appear to be the same color throughout. “least mixed” • The particles are large enough to be seen and easy to separate from the mixture.

Homogeneous Mixtures • A mixture that appears to be the same color throughout. “well mixed” • Particles are very small and not easily recognized. They do not separate while standing.

Colloids • The particles in a colloid are constantly bombarded by other particles in this mixture. • This makes colloids appear cloudy. • Look at page 64 figure 3 -9

Solutions • Formed when one substance dissolves in another. “Best mixed”

Solute The substance that is being dissolved. Solvent The substance that does the dissolving.

Solubility Soluble • A substance that dissolves in water. Insoluble • A substance that does not dissolve in water.

Solubility • The amount of a solute that can be completely dissolved in a given amount of a solvent. • It is affected by several factors such as temperature.

Alloys • Metal solutions are called alloys. • Solids dissolved in solids.