USC Bridge 1.2 molecules, compounds, and mixtures

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Molecules

Two or more atoms bonded together i.e.: H2

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Compound

Molecule with two or more different kinds of atoms bonded together i.e.: C6H12O6

can be separated only by breaking bonds

are all homogeneous or the same

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Mixtures

Two or more components physically intermixed 3 types: solutions, colloid, suspension

no chemical bonding between components

can be separated by straining or filtering

heterogenous or homogeneous

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Solutions

Homogeneous mixtures of components that may be gasses, liquids, or solids.

Solute particles are very tiny, do not settle out or scatter light

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Concentration of solutions

Weight/volume mg/dl

percent or parts per 100 parts

molarity or moles/liter- most precise way of describing a concentration of a solution

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Solvent

Present in the greatest amount

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Solutes

Substance present in the smallest amount

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Molecular weight

A mole of any element or compound is equal to its atomic weight

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Avogadros number

One mole of any substance always contains exactly the same number of solute particles

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Colloids

Also called emulsion, are heterogeneous mixtures which means that their composition is dissimilar in different areas of the mixture.

Solute particles are larger than in a solution and scatter light; do not settle out

colloids can change from liquid to gel

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Suspension

Heterogeneous mixture

visible solutes that tend to settle out

solute particles are very large, often visible, settle out and may scatter light

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When two atoms of two different elements bind together they form an:

Compound

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What mixtures are homogeneous?

Solutions