1. Classification of Matter
Quick Review
Classification of Matter
Modified by LRJ 2017

2. What is a Pure Substance?
A pure substance is a classification of matter that includes both elements and compounds
Pure substances cannot be separated by physical means such as distillation, filtration, or chromatography

3. Atoms Elements The building blocks of Matter
Consists of Protons (+), Electrons (-),
and Neutrons (N).
Elements
Consists of only one kind of atom,
Cannot be broken down into a simpler type of matter by either physical or chemical means
Can exist as either atoms or molecules.
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4. Molecules
A molecule consists of two or more atoms of the same element, or different elements, that are chemically bound together.
In the animation above, two nitrogen atoms
(N + N = N2) make one Nitrogen molecule .

5. Compounds Atoms of two or more different elements bound together.
Can be separated into elements chemically, but not physically.
In the animation above, water (H20) is a compound made of Hydrogen and Oxygen.
Animated images and notes from

6. Mixtures
A mixture is the physical combination of 2 or more substances meaning they are substances held together by physical forces, not chemical.
It is important to understand that a mixture is NOT chemically combined
Mixtures can be separated by physical means such as filtration, distillation, and chromatography
Mixtures can be divided into 2 groups
Homogenous mixtures
Heterogeneous mixtures

7. Homogeneous (Solutions)
A homogeneous mixture is a mixture that is evenly distributed.
Homogeneous mixtures are commonly called solutions.
Uniform Distribution.
Example: Sugar and Water
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8. Solute Solvent The substance to be dissolved.
The one doing the dissolving.
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9. Making a Solution

10. Colloids
Particle sizes are in between the size of particles found in solutions and suspensions .
Can be mixed and remain evenly distributed without settling out.

11. Heterogeneous Mixtures
A heterogeneous mixture is a mixture that is unevenly distributed.
Can be separated physically.
Examples:
Iced tea: The ice is floating at the top and therefore is not evenly distributed throughout the tea
Chex Mix: You may find a different number of pretzels or Chex cereal in each handful; therefore, the mixture is unevenly distributed
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12. Mixtures Suspensions Are heterogeneous mixtures consisting of parts
that are visible to the naked eye.
Substances will settle over time.
Example: the ingredients in salad dressing

13. Classifying Matter Matter Pure Substances Mixtures Elements Compounds
Homogeneous
Heterogeneous
Elements
Compounds
milk, tea, air, kool-aid, alloy
butter pecan ice cream, muddy water, salad, oil/vinegar
Fe, Na, Cu, I
H2O, CO2, NaCl, CuSO4

14. Matter
Pure Substances
Element
Compounds
Molecules
Mixtures
Homogeneous
Solution
Solvent
Colloids
Heterogeneous
Suspensions