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Chapter 1

Sections 1, 2, 3

TermDefinition
Matter Anything that has mass and takes up space
Chemistry The study of the properties of matter
Substance A single kind of matter that is pure and has a specific set of properties
Physical Property A characteristic of a pure substance the can be observed without changing it into another substance
Chemical Property A characteristic of a pure substance that describes its ability to change into a different substance
Element A pure substance that cannot be broken down into other substances by physical or chemical means
Atom The basic particle of a substance
Chemical Bond The force that holds two atoms together
Molecule A particle made of two or more atoms chemically bonded together
Compound A pure substance made of two or more elements chemically combined
Chemical Formula A formula that gives the elements in a compound and the ratio of atoms
Mixture Two or more substances that are mixed together but not chemically combined
Heterogeneous Mixture A mixture in which pure substances are unevenly distributed throughout the mixture (can see the different parts)
Homogeneous Mixture A mixture in which substances are evenly distributed throughout the mixture (cannot see different parts)
Solution An example of a homogeneous mixture; forms when substances dissolve
Weight A measure of the force of gravity on an object. Changes with location.
Mass The measure of the amount of matter in an object. Does not change with location. (M= d*v)
SI System The system of units used by scientists to measure the properties of matter
Volume The amount of space that matter occupies (v= l*w*h)
Density The measurement of how much mass of a substance in contained in a given volume (D= m/v)
Physical Change A change in a substance that does not change its identity
Chemical Change A change in which one or more substances combine or break apart to form new substances
Law of Conservation of Mass The principal that the total amount of matter is neither created nor destroyed during any physical or chemical change
Energy The ability to do work or cause change
Temperature The measure of the average energy of motion of the particles of a substance
Thermal Energy The total energy of all the particles of an object
Endothermic Change A change in which energy is taken in
Exothermic Change A change in which energy is given off.
Created by: kaitlynpeters15