density
how much mass something has compared to how much space out takes up. physical
conductivity
measures how easily electrical current flows through something. physical
half life
measures how long it takes for half of the material to decay and lose its energy. chemical
reactivity
measures how something reacts to something else. chemical
pure substance
is matter that has definite chemical and physical properties made of only one type of molecule
element
a pure substance that is made up of only one type of atom
periodic table of elements
a chart the elements are organized into
atom
the smallest particle of an element can not be seen by our eyes
molecule
formed when two or more atoms join together
compound
a pure substance made of two or more elements that are chemically combined
mixture
contains two or more pure substances that are mixed together but not chemically combined. there are two types
solute
in a solution it is the substance that "gets dissolved
homogeneous mixture
the substances are mixed thoroughly, at times you cannot tell there is more than one substance in the mixture
heterogeneous
you can see the different substances that are combined you can see all the different parts
solvent
in a solution is what another substance is dissolved into
suspension
is created when your solute is incapable of dissolving into your solvent
mechanical mix
heterogenous mixture
solution
the name for homogenous mixture that is mixed so well you can no longer see the different substances made up of two parts solvent and solute
catalyst
is a substance that helps the reactants in a chemical reaction react with each other faster
pressure
when force is being exerted on a substance. high pressure causes a reaction to happen quicker low pressure reaction happens slower
surface area
the amount of substance that is on it's outsides faces
products
are the chemicals produced by a reaction
reactants
are the chemicals that exist before the reaction
concentration
how much of a substance there is. if there is more of a substance the reaction happens quicker if there is not a lot the reaction happens slower
enzymes
proteins that act as a catalyst
agitation
when you are causing vigorous movement
rate of reaction
how fast or slow a reaction happens
endothermic
a reaction that uses heat (absorbs)
exothermic
a reaction from the release of heat