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Mixtures Mr. Skirbst Physical Science Topic 11
4 Classes of Matter
1. Mixtures 2. Solutions 3. Elements 4. Compounds
Mixtures A combination of two or more substances mixed together but not chemically combined
Properties of Mixtures Substances keep identity No new substances formed No fixed proportions Can be physically separated
2 Types of Mixtures 1.Heterogeneous - different throughout - least mixed mixture (ex. Tossed salad)
2 Types of Mixtures 2.Homogeneous - same throughout - well-mixed mixture (ex. milk)
Homogeneous Mixtures Colloid - particles are mixed, but not dissolved Solution - particles are dissolved
Solutions Homogeneous mixture formed when one substance dissolves in another
Solutions Solute – substance that IS dissolved Solvent – substance that DOES the dissolving Solubility – substance’s ABILITY to dissolve
Lab Techniques Decanting– separating liquids + solids by pouring off liquid Filtering– separating liquids + solids by passing through a filter (semi-permeable membrane)
Example of Physical Change
Pure substance Only one kind of material
Mixtures. A mixture is a combination of two or more substances where there is no chemical combination or reaction.
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