Chemical Foundations
Periodicity and Electron Configuration
Naming and Chemical Formulas
Lewis Structures
Atomic Structure and Isotopes
100
Express each answer in scientific notation with the correct number of sig figs.
2.35 + 4.57 + 5.1 + 8.697=
2.07e1
100
How many d orbitals are contained in a d subshell?
5
100
Give the name of the compound with the formula PCl5.
***spelling counts****
phosphorus pentachloride
100
How many total valence electrons are in a molecules of water? (H2O)
8
100
How many neutrons are there in the nucleus of 108^Ag?
61
200
What is the best answer to report for (629 x 0.0045) + 22.11?
24.9
200
How many electrons can be present in all orbitals with n = 4 and ℓ = 1?
6
200
What is the formula of dinitrogen tetroxide?
N2O4
200
In the best Lewis structure of SO3 (sulfur trioxide) that obeys the octet rule, what is the formal charge on sulfur?
+2
200
How many protons and electrons are present in a Ca2+ ion?
20 protons, 18 electrons
300
Use scientific (exponential) notation to express the following quantities in terms of the given SI base units.
(Enter your answer using one of the following formats: 1.2e-3 for 0.0012 and 1.20e+2 for 120.)
(a)
0.237 nm to meters
2.37e-10 m
300
Of the following, which element has the highest first ionization energy, IE1?
Al
Cl
Na
P
Cl
300
Write the systematic name of the compound, Ca(NO3)2. (Spelling counts.)
Calcium Nitrate
(caps does not matter)
300
Based on the best Lewis structure for the cyanide ion, CN-, what is the formal charge on nitrogen?
0
300
A sample of chemical X is found to contain 5.0 grams of oxygen, 10.0 grams of carbon, and 20.0 grams of nitrogen. The law of definite proportion would predict that a 61 gram sample of chemical X should contain how many grams of carbon?
17 grams
400
Use scientific (exponential) notation to express the following quantities in terms of the given SI base units.
(Enter your answer using one of the following formats: 1.2e-3 for 0.0012 and 1.20e+2 for 120.)
(a)
74.1 Mm to m
7.41e7
400
(a) What is the wavelength (in nm) of light with a photon energy of 2.11e-19 J?
nm
(b) What is the frequency of light with a photon energy of 2.11e-19 J?
s-1
a) 941 nm
b) 3.18e14 s-1
400
Give the name or chemical formula (as appropriate) for each of the following inorganic acids. (Omit states-of-matter from your answer.)
carbonic acid(aq)
H2CO3
400
How many lone pairs are present on the central atom in the best Lewis structure of ClF3?
2 lone pairs
400
A fluorocarbon is known to contain only carbon, fluorine, and hydrogen. The first sample is measured to contain 12.10 g of carbon, 5.22 g of fluorine, and 1.94 g of hydrogen. If a second sample of the same fluorocarbon is measured to contain 34.50 g of carbon, what is the mass of the fluorine in the second sample?
14.9 grams
500
Which of the following is an example of a pure compound?
Water
Bread
Oxygen
Air
Salt water
Water
500
According to the Bohr model, what is the energy change, in joules, that occurs when an electron moves from the n = 3 to the n = 5 energy level of a hydrogen atom?
Recall: En = −2.180 ✕ 10−18 J 
1/n2
.
1.55 ✕ 10-19 J
500
Give the name or chemical formula (as appropriate) for each of the following inorganic acids. (Omit states-of-matter from your answer.)
sulfuric acid(aq)
H2SO4
500
Which of the following molecules violates the octet rule by having more than eight electrons on the central atom?
CO2
NH3
SF6
SO2
BF3
SF6
500
A fluorocarbon is known to contain only carbon, fluorine, and hydrogen. The first sample is measured to contain 11.80 g of carbon, 22.42 g of fluorine, and 1.19 g of hydrogen. If a second sample of the same fluorocarbon is measured to contain 22.10 g of carbon, what is the total mass in grams of fluorocarbon in the second sample?
66.32 g