Compound Names
What is the name for the following binary IONIC compounds:
KCl
Li2O
MgCl2
Potassium Chloride
Lithium Oxide
Magnesium Chloride
The smallest whole-number ratio of atoms of each element, combined in the simplest unit of a chemical compound is known as a(n):
a. molecular formula
b. formula unit
c. empirical formula
d. molecule
c. empirical formula
In 10.0g of C3H4, how many moles of the compound are present?
0.250 mole
Write the empirical formulas to match the following molecular formulas:
C2H6O4
N2O5
Hg2C12
CH3O2
N2O5
HgC6
What is your favorite class right now?
Chemistry (of course!).
p.s. I'm OK if you lie to me for the jeopardy points!
In a Stock System name such as iron (III) sulfate, what does the Roman numeral tell us?
It tells us the positive charge on each Fe (iron) atom.
What is the formula for dinitrogen pentoxide?
N2O5
Compound A has a molar mass of 20 g/mol.
Compound B has a molar mass of 30 g/mol.
How many moles of compound B are needed to have htee same mass as 6.0 mol of compound A?
4 mol.
A certain hydrocarbon has an empirical formula of CH2 and a molar mass of 56.12 g/mol. What is its molecular formula?
C4H8
Assign oxidation numbers to the following compounds:
- H2SO3
- Na2CrO4
H +1. S +4. O -2
Na -1. Cr +6. O -2
What is the stock system name for
FeO?
SnO2?
Iron (II) oxide
Tin (IV) Oxide
What other information do you need in order to determine the molecular formula from the empirical formula of a compound?
a. the number of moles of the compound
b. the formula/molecular mass of the compound
c. the oxidation numbers of all the elements in the compound
d. the smallest whole-number mole ratio of the atoms in the compound.
b. the formula mass of the compound.
For the compound Al2O3, what is the percent composition of Al?
52.9%
A certain ionic compound contains:
0.012 mol sodium
0.012 mol sulfur
0.018 mol oxygen
What is the empirical formula?
Na2S2O3
Determine the molar mass of Al2(CrO4)3
401.96 g/mol
Give the formula for :
Tetraphosphorus decoxide
Give the prefix name for:
SiO2
P4O10
Silicon Dioxide
How does an empirical formula relate to:
a molecular formula and
a formula unit?
The empirical formula is the simplest ratio of a molecular formula for molecules (covalent bonds).
The empirical formula equals the formula unit for ionic compounds (ionic bonds).
In 10.0g of C3H4, how many molecules of the compound are present?
1.50 X 1023 molecules
A compound is found to contain
43.2% Copper
24.1% chlorine
32.7% oxygen
What is the empirical formula?
CuClO3
Give the formula for Chromium (III) Sulfate.
The sulfate ion is SO4 with a charge of -2.
Cr2(SO4)3
Name the prefixes used for naming molecular compounds for 1-10 atoms.
1: mono
2: di
3: tri
4: tetra
5: penta
6: hexa
7: hepta
8: octa
9: nona
10: deca
The explosive TNT has the molecular formula C7H5(NO2)3.
a. How many total atoms are in the molecule?
b. How many oxygen atoms are present in the molecule?
c. In one mole of TNT, how many moles of carbon are there?
a. 21 atoms in each molecule
b. 6 atoms of O in each molecule
c. 7 moles of carbon in 1 mole of TNT
Calculate the mass in grams of
2.5 x 109 H2O molecules.
7.5 x 10-14 g H2O.
A gas is found to be
24.0% carbon and
76.0% florine by mass.
The molar mass is 200.04g/mol.
What is the molecular formula?
C4F8
Fill in the blanks below for assigning oxidation numbers:
1. The oxidation number of any element is ________
2. The oxidation number of a monatomic ion equals the _______ of the ion.
3. The more ___________ element in a binary compound is assigned the number equal to the charge it would take if it were an ion.
4. Flourine ALWAYS has an oxidation number of _____
5. Hydrogen is always +1, unless it combines with a ________ and then it is -1.
6. The sum of the oxidation numbers of all atoms in a neutral compound is ____________
1. 0
2. charge
3. electronegative
4. -1
5. metal
6. 0.
(Note: You should also know the rules for oxygen!)