Properties of Matter

Main topics of this unit Pure substances verses mixtures Density Conductivity Thermal Energy Endothermic and Exothermic Reactions

Chemical Properties Chemical Properties

the ways a pure substance behaves when it combines with other pure substances

Describe the kinds of chemical reactions a substance can undergo

Pure Substances vs. Mixtures Pure Substances

Contain only a single type of matter Mixtures

Two or more pure substances intermingled together Homogeneous Mixtures (also known as solutions)

The composition of the mixture is identical throughout Heterogeneous Mixtures

The composition of the mixture is not the same throughout

In flow-diagram form:

Examples

Separation of Mixtures

Examples to separate heterogeneous mixtures:- Magnetic

- Filtration

Examples to separate homogeneous mixtures:- Distillation

- Chromatography

Separation of Mixtures by Paper Chromatography

Mixtures: Homogeneous vs. Heterogeneous

Are the following mixtures homogeneous or heterogeneous? Well-stirred mixture of food dye in water Bee’s wax and candle wax mixed together by

hand Bee’s wax and candle wax melted together,

stirred well, then allowed to solidify