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25 terms

chemistry chapter 1.1

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chemistry
science that investigates and explains the structure and properties of matter
mass
the measure of the amount of matter that an object contains
physical properties
characteristics of a sample of matter that can be observed or measured without any change in its identity
atoms
what matter is made up of
macroscopic
large enough to be seen
submicroscopic
too small to be seen with a light microscope
scientific model
helps explain macroscopic observations
qualitative observation
made without measurements
quantitative observation
uses measurements
substance
matter with the same fixed composition and properties
examples of a pure substance
elements & compounds
mixture
combination of two or more substances in which the basic identity of each substance is not changed
physical changes
changes in matter that do not involve a change in the identity
examples of physical changes
boiling, freezing, melting
examples of mixtures
soil, air, seawater
examples of physical properties
melting point, color, density, physical state
heterogeneous mixture
does not have a uniform composition and individual substances remain distinct
homogeneous mixture
has a constant composition
solute
substance being dissolved
solvent
substance that dissolves the solute
aqueous solution
the solvent is water
pure substance
made of only one substance
compound
type of pure substance that can be broken down into simpler substances; chemical combination of two or more different elements joined in a fixed proportion
element
type of pure substance that cannot be broken down into simpler substances
chemical formula
combination of the chemical symbols that show what elements make up a compound and the number of atoms of each element