Key for Micro Exam 2 Question 11
11. Which element or ion has the electron configuration of [Ar] 3d6?
(c) Cr2(d) Fe2+
(f) Doesnt exist
Electron configurations are a method for accounting for all the electrons in an atom or ion. The
16. Which of the following are characteristics that describe the following molecule:
e. two of the above
f. three of a-d
g. none of the above
Lets look at the answers one at a time.
17. Determine the increase in temperature of 1.0 L of water if the heat from the complete
combustion of 6 g of the alkane called ethane (which has 2 carbons) is used to heat the water.
(Use 4 J/ g-K for the specific heat of water)
H (delta H) = -1550
19. What is the percent yield of the combustion of 0.60 g of propanol (C3H7OH) to form carbon
dioxide if the heat from the reaction is just enough to warm up 1 L of water by 2 C ?
H (delta H) = -2000 kJ/ mol C3H7OH
a. < 1 %
b. 4.0 %
c. 22 %
d. 40 %
20. Which of the following molecules contains at least one atom with sp2 hybridization?
a. the alkane with 3 carbon atoms (propane)
b. the alcohol made from propane
c. acetic acid
f. 2 of the above
g. 3 of the above
Remember that s
3. If I substitute one hydrogen in acetylene (HCCH) with a methyl group (-CH3), the
resulting molecule contains _ sigma bonds, _ pi bonds, and _ H atoms.
First draw the new structure. Here it is b
Oxidation is losing electrons, or in other words losing negative charge. If something loses
negative charge, it becomes more positive. So, if the oxidation state becomes more positive, it
must have been oxidized, as is the case in this problem.
Saturated means only the structure contains and only single bonds. A hydrocarbon contains only
carbon and hydrogen atoms. This eliminates choices c-g which all contain either double bonds
or non-carbon/hydrogen atoms. This leaves only choices a and b
8. What volume of hydrogen gas is required to completely react with 100.0 L of nitrogen gas
at STP to yield ammonia?
a. 100.0 L
b. 200.0 L
c. 300.0 L
d. 275.0 L
e. 345.0 L
f. 456.0 L
g. 580.0 L
Remember, to completely react, you need the correct stoi
How many He atoms are found in a party balloon with volume 2 L on a warm day at the
north pole (T=0C). Remember, the north pole is at sea level.
a. 5 x 1022
b. 5 x 1024
c. 6 x 1023
d. 0.90 mol
e. 3 mol
f. 50 mol
g. 100 mol
This problem involves dimen
Chem 106 Macedone
Writing assignment #1
Section # 2
My elemental composition choice would be fish, mostly because it is one of my main choices of
meat to eat. From chemistry I have learned that there are amounts of mercury an
11. The pressure in a balloon filled with 3 L of gas at STP is cut in half while the volume and
number of moles remain constant. What is the new temperature inside the balloon?
a. -136 C
b. 1400 K
c. 0 C
d. 273 C
e. hotter than the sun
f. none of the
Word count: 242
Metallurgy writing assignment
Copper minerals are found mixed in the ground with other ores such as bornite and
malachite. Theses ores are found all over the world in both igneous and sedimentary rock. In
13. If a linear hydrocarbon contains a permanent kink in its chain, which of the following must
a. The compound must be saturated
b. The compound must contain a double bond
c. The compound must be a surfactant
d. The compound must contain an
Philip R. Brown
Office Phone: 801-422-9089
Cell Phone: 801-361-1908 (Between 7:00 a.m. and 8:00 p.m.)
8:00-8:50 a.m. M, W, F
Tuesdays in assigned rooms
Daily from 9:00 till 11:
15. The number of moles of an ideal gas in a container varies.
a. directly as the temperature and inversely (indirectly) as volume.
b. inversely (indirectly) as the ideal gas constant and directly as the pressure.
c. inversely (indirectly) as the pre
14. Using Table 8.4 (p. 326), estimate the enthalpy of the reaction when 11 grams of the alkane
called propane (C3H8) is completely combusted. (Round liberally)
a. 1200 kJ
b. -2000 kJ
c. -700 kJ
d. -500 kJ
e. 1.8 x 10 atoms
f. None of the above
13. Which of the following is an example of an alcohol which contains a double bond?
a. methanol, which is methane with one hydrogen atom replaced by -OH.
b. ethanol, which is CH3CH2OH
f. none of these
This problem r
11. H (delta H) is
a. nearly equal to E (delta E) when all reactants and products are solids and liquids.
b. equal to the change in entropy
c. equal to the total internal energy
d. the energy needed to break a covalent bond
e. equal to the standard
Philip R. Brown
1998-2005 Brigham Young University
Provo, Utah 84602
Key for Micro Exam 2 Question 20
Question 20: Which of the structures is the correct Lewis structure for the beryllium ion (Be-)
that has one extra electron?
When drawing a Lewis structure, we first need to know the total
Key for Micro Exam 4 Question 1
Pick the species which is a free radical and exists as resonance structures:
(a) nitrogen dioxide
(b) nitrite ion
(c) nitrate ion
(d) perchlorate ion
(f) sodium chloride
(g) more than one of
Key for Micro Exam 4 Question 6
Which species contains an expanded octet and is polar?
(a) sulfur dioxide
(b) aluminum trichloride
(c) bromine pentafluoride
(d) silicon dioxide
(e) lead(IV) iodide
(h) two of thes
Key for Micro Exam 4 Question 8
(Try this problem without a calculator) 0.10 mol of a compound with the
empirical formula CH3O weighs 6.2 g. The molecular formula of the compound
Key for Micro Exam 4 Question 9
(Try this problem without a calculator) How many moles of cyanide ions are
found in 13.0 g of chromium(III) cyanide?
(a) 0.10 mol
(b) 0.20 mol
(c) 0.30 mol
(d) 0.40 mol
(e) 0.50 mol
(f) 1.0 mol
Key for Micro Exam 4 Question 14
Question 14: How many total ions are there in 40.0 g of calcium acetate?
(a) 4.52 x 1023
(b) 5.82 x 1023
(c) 1.52 x 1024
(d) 7.22 x 1023
(e) 2.41 x 1023
(f) 6.02 x 1023
(g) 1.51 x 1023
(h) 1.80 x 1025
Any time you
If a substance has an empirical formula of NO2 and a formula weight of 138 g, what is the
The empirical (or simplest) formula is the lowest integral form of th
Take Home Quiz 5
Due at the beginning of class Friday February 4, 2011
[6 points] From a mixture, you are separating two proteins using polyacrylamide gel electrophoresis. The
proteins are 30,000 MW and 60,000 MW. The proteins were boiled in the