Pure Substances
Mixtures
A mixture is a material made up of two or more substances that can be easily separated by physical means.
The number of mixtures that can be created by combining substances is unlimited
Mixtures do not always contain the same proportions of the substances that make them up.
Heterogenous Mixture: A mixture in which different materials can be distinguished easily
Heterogeneous mixtures can be hard to detect.
Homogeneous Mixture: contains two or more gaseous, liquid, or solid substances blended evenly throughout.
Solution: a homogeneous mixture of particles so small that they cannot be seen with a microscope and will never settle to the bottom of their container.
Solutions remain constantly and uniformly mixed.
All matter can be divided into substances and mixtures.
Colloid: a type of mixture with particles that are larger than those in solutions but not heavy enough to settle out.
One way to distinguish a colloid from a solution is by its appearance.
Fog is a colloid composed of water droplets suspended \n in air.
Tyndall Effect: The scattering of light by colloidal particles
Suspension: a heterogeneous mixture containing a liquid in which visible particles settle.
River deltas are large scale examples of how
a suspension settles.
Physical Properties
Physical Changes
Chemical Properties and Changes
Detecting Chemical Changes
Weathering - Chemical or Physical Change
The Conservation of Mass
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