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Formula Mass
Oxidation Numbers
What's the formula?
Name that compound!
Terms
100
What is the mass number of Carbon
12
100
The magic number of electrons that an atom wants in its outer shell is ____
8
100
Boron tribromide
BBr3
100
C2O
Carbon dioxide
100
Chemical Formula
A way of writing the name of a compound using chemical symbols
200
How do you determine the mass number of an atom?
Round its atomic mass (the number under the chemical symbol) to the nearest whole number
200
An atom that gains electrons will have a ________ oxidation number
Negative
200
carbon monosulfide
CS
200
H2O
Dihydrogen monoxide
200
Subscript
A number written to the lower right of a chemical symbol
300
Define formula mass
The sum of the mass numbers of all the atoms in a molecule or ions in an ionic compound.
300
What is the oxidation state of Calcium
+2
300
diboron triselenide
B2Se3
300
CrBr2
Chromium (II) bromide
300
Binary Compound
Two different elements chemically combined
400
Calculate the formula mass for NO2
46
400
Metals usually have a __________ oxidation number
Positive
400
Manganese (III) iodide
MnI3
400
Ca(OH)2
Calcium hydroxide
400
Polyatomic Ion
A group of atoms that act as a charged atom when combining with other atoms
500
Calculate the formula mass for Sodium Phosphate
Sodium Phosphate = Na3PO4 Na = 23 X 3 = 69 P = 31 X 1 = 31 O = 16 X 4 = 64 Total = 164
500
What is the oxidation state of iron in FeCl3
+3
500
iron (III) nitrate
Fe(NO3)3
500
Cd(NO3)2
Cadmium nitrate
500
Oxidation Number
It shows how many electrons an atom gains, loses or shares when it forms a chemical bond