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Science Chapter 2

TermDefinition
Matter anything that has mass and takes up space
Chemistry the study of the properties of matter and how matter changes
Substance a single kind of matter that is pure, meaning it always hasa specific makeup-or composition- and a specific set of properties
element a pure substance that cannot be broken down into any other substance by chemical or physical means
atom the basic particle from which all elements are made
chemical bond a force of attraction between two atoms
molecules groups of two or more atoms held together by chemical bonds
compound a pure substance made of two or more elements chemically combined in a set ratio
chemical formula a combination of symbols that represents the elements in a compound and their proportions
mixture made of two or more substances- elements, compunds, or both- that are together in the same place but are not chemically combined
heterogeneous mixtures when you can see the different parts in a mixture
homogeneous mixtures when you can't see the parts in a mixture because they are so evenly mixed
solution an example of a homogeneous mixture that doesn't have to be a liquid
weight a measure of the force of gravity on you
mass the measurement of the amount of matter in an object
International System of Units
volume the amount of space that matter occupies
density the mass of a material in a given volume
physical change any change that alter sthe form or appearance of matter but does not make any substance in the matter into a different substance
chemical change a change in matter that produces one or more new substances
law of conservation of mass the fact that matter is not created or destored in any chemical or physical change
temperature a measure of the average energy of random motion of particles of matter
thermal energy the total energy of all of the particles in an object
endothermic change a change in whicha energy is taken in
exothermic change releases energy
combustion a chemical cahnge that releases energy in the for of heat and light
Created by: mad.morrow
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