Physical or Chemical Change?Physical or Chemical Change?

Rusting iron nails Dissolving sugar into iced tea Cutting paper into smaller pieces Plastic becoming brittle when left out

in the sun

C.P.

P.

C.

Review

4 States of Matter Physical Changes Change of State Chemical Changes

MixturesMixtures Two or more substances

physically combined NOT chemically combined

The parts of a mixture can be elements, compounds or elements and compounds

MixturesMixtures No chemical reaction takes place No new substance is formed All substances in a mixture retain

their individual properties

MixturesMixtures They can be arranged in any

way The ratio of a mixtures parts

are not exact

MixturesMixtures Two classifications of mixtures: 1. Heterogeneous A mixture that is not the same

throughout Salad, trail mix, Lucky Charms

MixturesMixtures 2. Homogeneous A mixture that is the same

throughout Its mixed so well it looks like

one substance Milk, air, sugar cookies

Separating Mixtures Separating Mixtures

Separate the parts of the mixture

Not the linked up atoms Separated physically or

mechanically

Different Ways to Separate Different Ways to Separate MixturesMixtures

Straining

Different Ways to Separate Different Ways to Separate MixturesMixtures

Magnets

Different Ways to Separate Different Ways to Separate MixturesMixtures

Dissolving

Different Ways to Separate Different Ways to Separate MixturesMixtures

Evaporation

Different Ways to Separate Different Ways to Separate MixturesMixtures

Density