Chem Vocab Ch. 1-3

the science of matter and the changes which matter undergoes

anything that has mass and occupies space

a single atom of an element

collections of atoms having particular shapes

2D arrangement of the elements

protons, neutrons, electrons

atoms of the same element with a different # of neutrons

atoms of one element cannot be converted into atoms of another element by chemical means

matter having a definite (fixed) composition

elements that exist in a different form

substances consisting of 2+ elements

a representation of a substance that indicates the relative numbers of different atoms present using atomic symbols and numeric subscripts

forces that hold atoms to one another in elements or compounds

any homogenous mixture

any mixture that does not have a uniform composition throughout

the major component in which others are dissolved

substance dissolved in the solvent

a solution in which the solvent is water

homogenous mixture of metals

"chemical reaction"  a change resulting in at least one of the substances changing into a different substance, chemical bonds must change

a substance undergoes change in some property, but is not converted into a different substance

heat absorbed

heat released

solid -> gas

the ways in which chemical substances react with other chemical substances

the physical characteristics of a chemical substance (misture or substances)

the method of expressing any # as a nuber between 1 and 10 multiplied by some power of 10

12 in

3 ft

5280 ft

m

kg

s

K   C+273.15

mol

N  

J     or N x m

Pa   and 

10⁹

10⁶

10³

10^-1

10^-2

10^-3

10^-6

10^-9

10^-12

Å  10^-10 m

atm    760 torr, 1.01325 bar

torr   mmHg

bar    0.987 atm or 750 torr

C= 5/9 (F-32)

cm³ or cc    cm³= mL

hz    hz=s^-1

1 in= 2.54 cm, 1 lb= .454 kg, 1 L= 1.06 qt, 1 mile= 1.609 km