Types of Substances
the 2 categories of pure substances
elements and compounds
the # of protons is represented by this
atomic number
a mixture with relatively large particles which will settle due to the effect of gravity
suspensions
length
meter
burning a log is an example of ___________ change
chemical
pure substances made up of 1 type of atom, which all have the same number of protons
element
this number listed with an element is the weighted average of all the masses of that element
atomic mass
a mixture with medium sized particles which will not settle out; particles held in place by the motion of the molecules around them
colloids
volume
m3, cm3, L, mL
physical
mixtures which are uniformly mixed at the molecular level
homogeneous mixtures
some elements have _________ which don't match up with their names, because they are based on the latin name of the element
chemical symbols
the elements or compounds that go into a reaction
reactants
temperature
Celsius
the unit for temperature which is based on absolute zero
Kelvin
mixtures which are not uniformly mixed. the different parts can be seen with the naked eye or with a microscope
heterogeneous mixtures
the elements or compounds that come out of a reaction
products
Mass
kilogram
how fine a measurement is; indicated by the number of significant figures
precision
a pure substance dissolved in another pure substance ie. salt dissolved in water
solution
a process which results in the formation or breaking of chemical bonds
chemical reaction
density, color, opacity and malleability are examples of ____________ properties
physical
amount of substance
mole
how close a measurement is to the true value
accuracy