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21 Cards in this Set

  • Front
  • Back
Matter
"stuff" which the universe is composed of
-has mass
-occupies space
Atoms
tiny particles that matter is composed of
Compounds
substances made by bonding atoms together in specific ways
ex. Carbon Dioxide
Molecule
made up of atoms that are "stuck" together
ex. glass of water
Elements
substances that contain only one type of atom and can't be broken down
Solid
rigid, fixed shape and volume
Liquid
definite volume and takes shape of container
Gas
no fixed shape or volume
Physical Properties
characteristic of substance that can change without the substance becoming a different substance
ex. odor, color, volume, state, boiling point, etc.
Chemical Properties
the ability of a substance to change to a different substance
ex. flammability
Physical Changes
changes that do not affect the composition of the substance
ex. melting ice, rubber being stretched
Chemical Changes
changes in the fundamental composition of the substance
ex. hydrofluoric acid attacks glass and is used to etch calibration marks on glass utensils
Reactions
Chemical changes
Mixture
something with variable composition
Alloys
Mixtures of metals
Pure Substance
elements or compounds, always has the same composition;
Homogeneous Mixture
same throughout; all regions of resulting mixture have same properties
ex. salt water
Solution
homogeneous mixture
Heterogeneous Mixture
regions with different properties from those of other regions
ex. italian dressing, oil and vinegar, sand water
Distillation
a method for separating the components of a liquid mixture that depends on differences in the ease of vaporization of components
Filtration
Method for separating the components of a mixture containing a solid and liquid