Test 2 Review A
What is the charge on the iron in the following compound: FeO?
+2
What is the oxidation number for oxygen? (This is the charge for oxygen when it becomes an ion)
-2
What is the oxidation number for the sulfate polyatomic ion?
-2
Which of the following is a polyatomic ion?
CN-
A compound is composed of 56.4% P and 43.6% O. What is the empirical formula of the compound?
P2O3
Name the following compound: Cu2O.
copper (I) oxide
Name the following compound: N2O4.
dinitrogen tetroxide
Which prefix is used to indicate seven atoms present in a covalent bond?
hepta
Name the following compound: HCl.
hydrochloric acid
What is the mass (in grams) of 0.50 moles of Neon (Ne)? [molar mass = 20.2 g/mol]
10. grams
What is the molar mass of carbon?
12.0 g/mol
Calculate the molar mass of nicotine (C10H14N2).
162.2 g/mol
What is the mass of one atom of carbon?
2 x 10-23 grams
What is the mass of 1.86 x 1022 molecules of P4? [molar mass = 124.0 g/mol]
239 grams
If a compound has an empirical formula of CH2 and a molar mass of its molecular formula of 56.0 g/mole, what is the molecular formula?
C4H8
Write the formula for the following compound: nitric acid. -
HNO3
Identify the following compound: SrS.
Ionic
What compound has the following characteristics: hard, high melting point, good conductor of electricity, and brittle.
Ionic
Describe the shape and polarity of the molecule O=C=Se.
It is linear and nonpolar
Write the formula for the following compound: nitrogen dioxide. -
NO2
Which of the following elements has the Lewis symbol below, where Sy represents the elemental symbol? Sy: .
Al
What is a lone pair in a Lewis diagram?
An unshared pair of electrons
Which of the following atom disobeys the octet rule, thus only wanting 6 electrons around it's Lewis structure.
B
How does a phosphorus atom achieve an octet of electrons?
By gaining 3 electrons
Which of the following is an empirical formula?
C3H6O2
Name the following compound: BaSO4.
barium sulfate
How many moles of are in 8.36 x 1021 molecules of CO2? [molar mass = 44.0 g/mol]
0.0139 mol
The number 6.02 x 1023 is ?
1.00 mole
How many moles are there in 47.2 grams of the food preservative nisin, C143H230N42O37S7. [molar mass = 3354.12 g/mol]
1.41 x 10-2 mol
How many total valence electrons are in the compound CF4?
32
How many moles of sulfur are there in 17.62 grams of S8? [molar mass = 256.8 g/mol]
6.87 x 10-2 mol
What is the percent composition for Acetaminophen (C8H9NO2)? [molar mass = 151.0 g/mol]
63.6% C, 6.00% H, 9.30% N, 21.1% O
Calculate the percent composition of nicotine (C10H14N2).
74.0% C, 8.70% H, 17.3% N
How many moles are there in 5.418 x 1024 atoms Fe?
9 mol
What are atoms called that form positive ions?
Cations
Write the formula for the following compound: cobalt (II) iodide.
CoI2
Identify the following compound: N2O.
Covalent
What chemical bond is formed by the sharing of electrons?
Covalent
What is the molecular geometry surrounding the nitrogen atom in NH4+?
Tetrahedral
What is the electron pair geometry surrounding the boron atom in BH3?
Trigonal planar
Which of the following is the best Lewis diagram for NH2
[ H - N - H ] -
How many valence electrons does bromine have?
seven
Describe the electron pair geometry of the molecule ClF3.
trigonal bipyramidal