Conversions
2 km to m
2,000m
How many sig figs in 0.0021
2
smallest particle of an element that retains the chemical properties of that element
atom
came up with the atomic theory
Dalton
The sum of the reactants before a chemical reaction is equal to the sum of the products after the reaction
Law of Conservation of Mass
3,450 µL to L
0.00345L
How many sig figs in 102.040?
6
broad generalization that explains a body of facts or phenomena
theory
Credited with discovering the nucleus
Rutherford
Mass x + Mass y = Mass x + Mass y
Law of conservation of mass
5 km to mm
5,000,000mm
Round 332 to 1 sig fig.
300
variable being manipulated
independent
Coined the term "atom"
Democritus
NaCl is always 39.34% by mass of the element sodium and 60.66% by mass of chlorine.
Law of Definite Proportions
7 dg to ng
7 x 108 ng
multiple 14.3 and 1.2 and answer with the correct number of sig figs.
17
the transformation of a substance or substances into one or more new substances
chemical reaction
used cathode ray tubes to discover electrons were found in all atoms
J.J. Thomson
A molecule of carbon dioxide contains twice as many oxygen atoms as does a molecule of carbon monoxide.
14 g/L to kg/mL
0.000014 or 1.4 x 10-5
99.3 + 12.141
111.4
specific portion of matter in a given region of space that has been selected for study during an experiment or observation.
system
Did the oil drop experiment to measure the charge of the electron
Millikan
A given chemical compound is always composed of the same combination of atoms.
Law of Definite Proportions