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Pre-Chem Studying
N/A
16
Chemistry
Undergraduate 1
11/20/2012

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Term
matter
Definition
-physical material of the universe
-anything that has mass and occupies space
Term
elements
Definition
100 or so elementary substances
Term
atoms
Definition
-building blocks of matter
-smallest particles of an element to retain its identity
Term
states of matter
Definition
-solid
-liquid
-gas
Term
pure substance
Definition
-matter that has distinct properties and a composition that does not vary from sample to sample
-ex: water and salt
Term
compound
Definition
-substances composed of 2 or more elements
-contains 2+ kinds of atoms
Term
mixtures
Definition
-combinations of 2+ substances where each substance retains its own unique identity
-can be separated
Term
law of constant composition
Definition
elemental composition of a pure compound is always the same
Term
solutions
Definition
homogeneous mixtures
Term
physical changes
Definition
-changes appearance but not composition
-ex: evaporation of water
-incl all changes of state
Term
chemical changes
Definition
-aka chemical rxns
-substance is transformed in to chemically different substance
-ex: when hydrogen burns in the air
Term
mass
Definition
-measure of the amount of material in an object
-base unit is the kilogram
Term
precision
Definition
how closely individual measurements agree with one another
Term
accuracy
Definition
how closely individual measurements agree with the correct or "true" value
Term
law of conservation of mass
Definition
-or matter
-atoms are neither created nor changed during chemical rxns
-total mass of materials present after a chemical rxn is the same as before
Term
nucleus
Definition
-extremely small dense region at the center of at atom
-most of the mass of an atom
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