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Chapter 2: Matter Sections 2.2 & 2.3
2.2 Properties of Matter ObjectivesTo learn to distinguish between physical and chemical properties To learn to distinguish between physical and chemical changes
Physical Property Characteristic of a substance that can change without changing the substance’s composition.
Physical Change A change that does not affect the composition of a substance
Examples of Physical ChangesMelting/ Freezing Vaporizing/ Condensing Cutting Grinding Squishing
Chemical Property Characteristic that describes the ability of a substance to change into a different substance.
Chemical Change Change in which a substance becomes a different substance.
Examples Flammability (burning) Exploding Fermenting DigestingCorroding Tarnishing Rusting
Evidence of a chemical change
Evidence of a chemical changeFormation of bubbles Formation of a precipitate (a solid) A color or odor change Heat, Cold and/ or light evolves
2.3 Classifying Matter ObjectivesTo learn to distinguish between mixtures and pure substances. To learn two methods of separating mixtures.
Mixtures and Pure SubstancesDefined as something w/ a variable composition. Examples: Soda – water, sugar, carbon dioxide Sea water – water, minerals, salt, etc. 14 carat gold – 36% gold, 25% silver, 37% copper Dirt Air – nitrogen, oxygen, argon, helium, neon, carbon dioxide, water vapor, etc.
2 Types of Mixtures Homogeneous Mixture: mixture that is the same throughout. Can also be called… solutions! Heterogeneous Mixture: mixture containing regions of varying composition.
Heterogeneous or Homogeneous Mixture?
Separation of MixturesMixtures can be separated utilizing each substances physical properties. There are several ways to separate mixtures… Use a magnet FILTRATION DISTILLATION Picking it out
Distillation A separation process that depends on the different boiling points of the substances.
Filtration Separation of a solid from a liquid by using filter paper.
Mixtures and Pure SubstancesAlways has the same composition, no matter what! Can be Elements See Periodic Table Compounds There are millions!!!!!! H2O, NaOH, Al2(SO4)3, NaCl, C6H12O6
Properties of Matter.
Pure substances and mixtures S8P1b. Describe the difference between pure substances (elements and compounds) and mixtures.
World of Chemistry Chapter 2 Matter
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Do Now #7 A physical change occurs when a substance changes form, but stays the same. A chemical change occurs when a substance changes into a new, different.
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Ch 2 Classifying Matter Draw the following chart on your paper make it big enough to fill the page & large enough to write in boxes.
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