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Classifying Matter Science 8 Mrs. Marks.

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Presentation on theme: "Classifying Matter Science 8 Mrs. Marks."— Presentation transcript:

1 Classifying Matter Science 8 Mrs. Marks


3 Based on the Makeup of Matter
Pure Substances Elements Compounds Mixtures

4 Elements Simplest pure substance
Cannot be changed into a simpler substance by heating or chemical process Atoms are the smallest particle of an element No two elements contain the same type of atom

5 Compound Two or more elements chemically combined into a pure substance The properties of a compound differ from those of the substances from which it is made Water is a liquid. What elements make up the water?

6 Compound (cont’d) A compound always contains two or more elements joined in a fixed proportion. (always the same formula) Can only be separated by electric energy, high heat, or chemical reaction

7 Mixture Two or more substances physically combined
The proportions of the substances can vary, no fixed recipe The substances can be separated by physical means (using each substance’s physical properties - color, weight, boiling point)

8 Types of Mixtures Homogeneous Heterogeneous
The substances are evenly distributed so that it is difficult to distinguish one substance in the mixture “Well mixed” General Examples: air, pudding Heterogeneous The parts of the mixture are noticeably different from one another “slightly mixed” General Examples: Salad, Dirt

9 Solutions (homogeneous)
When substances dissolve in another substance The particles in a solution are too small to settle out, be trapped by a filter or scatter light Tap water Salt water

10 Parts of Solutions Solute = the material that gets dissolved
Solvent = the substance that makes the solute dissolve Examples: Salt Water (salt= solute), (water=solvent) Removing nail polish (polish=solute), (remover=solvent)

11 Alloy – A special Solution
Mixture of 2 or more metals EXAMPLE: Brass, Bronze

12 Colloids (homogeneous)
Particle size are medium Colloids do not separate into layers, do not filter out They can scatter light Examples: Milk Fog Milk Fog

13 Suspensions (heterogeneous)
Separates into layer over time Particles can be filtered out Cloudy appearance Examples Dirty Water Salad Dressings Sand water mixture Muddy water

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