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Unit 2 Properties and Classification of Matter (properties matter…
Unit 2 Properties and Classification of Matter
Classifying Matter
Mixtures
Heterogeneous mixtures
See the different substances
muddy water, italian dressing
Homogeneous mixture
cannot see different substances
coffee, kool-aide, soda
Pure Substances
Elements
Same atoms
1 capital letter
Compounds
2 or more different atoms
2 or more capital letters
properties matter
Physical properties
color, odor, density, hardness, structures solubility, melting point and boiling point, freezing point
Chemical properties
reactivity, flammability, pH
Physical changes
melting, boiling, freezing, cutting, mixing, tearing
chemical changes
appearance of a gas
disappearance/appearance of a substance
formation of a precipitate (solid)
absorption of energy
production of light, heat, or sounds
changes in color or odor
explosion
Observations
Qualitative
how it looks, smells, tastes,
Quantitative
numbers