DETACH THIS SHEET AND USE AS A
COVER SHEET/SCRATCH SHEET.
KEEP YOUR WORK COVERED!
CH 100
120 pts
120 minutes
December 04, 2008
Cover Page
Final Exam
MAKE SURE YOU HAVE 4 PAGES INCLUDING THIS COVERSHEET. KEEP YOUR WORK COVERED.
BRIEFLY LOOK OVER THE QUIZ FIRST. DO NOT SPEND TOO MUCH TIME ON ANY ONE QUESTION. ANSWER
EACH OF THE QUESTIONS IN THE SPACE PROVIDED. PAY ATTENTION TO SIGNIFICANT FIGURES. SHOW
YOUR SET UP AND CALCULATIONS FOR CREDIT.
Equations you may need:
Ideal Gas Law:
PV = nRT or
P1V1/n1T1 = P2V2/n2T2
Energy:
KE = ½mv2
Cal = SHAmAΔT
ΔT = Tfinal - Tinitial
Acid/Base:
Henderson Hasselbalch Equation:
pH = pKa + log {[CB]/[CA]}
Kw = 1.0 X 10-14 ; pKw = 14.00
Constants you may need:
Ideal Gas Constant
R = 0.0821 LAatm/KAmol
Avogadro’s Number of units =
6.02214199 x 1023 units.
Name__________________________ (1 pt)
CH 100
December 04, 2008
120 pts - Fall 2008 - Page 1 of 3
T A __________________________
120 minutes
Final Exam
27 pts 1) Complete the following with the correct word or phrase. (1 pts each, except where noted)
a) The rusting of iron is an example of a physical
chemical (circle) change. b) The specific gravity of a
substance is the ratio of the ____________ of a substance to the ______________________. c) The specific
heat of a substance is ____________________________________________________. d) The group of
elements which have the lowest first ionization potentials all have the same _____ outer-most (i.e. the last one
written, e.g. np4 ) electron configuration; the group of elements which have the highest first ionization
potentials all have the same ______ outer-most electron configuration except for the first which has a _____
outer-most electron configuration. e) The elements of group 17 are all:
Metals
Metalloids
Non-metals
(Circle) f) The two sub-atomic particles composing the nucleus of most atoms are the ______________ and
the ______________.
g) The Atomic Number is equal to the number of ______________ in a given nucleus
and identifies the ____________ . h) Write the complete electron configuration of chromium: ___ ___ ___
___ ___ ___ ___ ___ ___ drawing a vertical line between subshells. (2 pts) i) The presence of the Tyndall
effect in a glass of liquid will distinguish ______________________________________________________ .
j) Write the chemical formulas for the following substances: Iron(III) sulfide _________ ; magnesium
phosphate _______ ; aluminum hydroxide __________ . k) Convert (show work) the following temperatures:
N2 boils at
77 K = __________ EC (1 pt) = __________ EF. (2 pts)
l) Name the following covalent compounds: (2 pts ea)
N2O4 _______________________________
N2O __________________________________
NCl3 _______________________________
10 pts 2) a) Draw the Lewis Dot and the VSEPR Structures for the following compounds. b) Write the angles
defined by the atoms bonded to the underlined element for each of the above species. [atom connectivity].
a) HNO2 [HONO]
b) H 3PO4 [(HO)3PO]
c) OSF4
04 pts 3) The reaction below was found to contain [Cl2] = 0.34 M; [NOCl] = 2.6 M; and [NO] = 1.4 M calculate
the equilibrium constant:
2 NOCl(g)
W
Cl2(g) +
2 NO(g)
Name__________________________
CH 100
December 04, 2008
120 pts - Fall 2008 - Page 2 of 3
T A __________________________
120 minutes
Final Exam
23 pts 4) Complete the following with the correct word or phrase. (1 pts each, except where noted)
a) A solution containing 10.0 mg acetic acid in 100 kg of solution is __________ ppb .
b) A 0.250 M
solution contains 0.050 moles solute in ___________ mL of solution. c) The theoretical yield of a
reaction is 50.0 grams product but only 15.0 grams was isolated the percent yield is ______. d) The
four hallmarks that a chemical reaction has occurred are: ____________________________________
__________________________________________________________________________________
_____________________________________________. e) A reaction that evolves heat during the
reaction is said to be _______________________. f) STP, Standard Temperature and Pressure is
___________________________. g) At STP one mole of any gas occupies _________ L of volume.
h) The solubility of a gas increases
decreases
is unchanged (circle) with increasing pressure.
i) The solubility of a gas increases decreases is unchanged (circle) with decreasing temperature.
j) The solubility of a solid usually increases decreases is unchanged (circle) with increasing Temp.
k) The solubility of a solid usually increases
decreases
is unchanged (circle) with decreasing
Pressure. l) List the three main forces of attraction between molecules in order of decreasing strength
(strongest first) ____________________________________________________________________
_________________________________________________________________________________ .
m) List the six factors known to affect the rate of a reaction: _______________________________
_________________________________________________________________________________
_________________________________________________________________________________ .
06 pts 5) Calculate to 4 sig. fig. the formula weight for: a) H3CCH2NH2 ; b) How many moles does 22.00
grams represent? Double check your calc. here! c) How many molecules does 22.00 grams represent?
04 pts 6) Calculate the density (g/L) at 350.0 K of 22.00 grams of H3CCH2NH2 gas at 1 atm. Pressure.
10 pts7) The combustion of 22.00 grams of H3CCH2NH2 in 160.0 grams of dioxygen yields carbon dioxide,
dinitrogen gas and water. Calculate the quantity of dinitrogen gas produced and the quantity of
dioxygen actually consumed.
Important! Make sure the chemical equation is balanced correctly!!
Balanced Chemical Equation:
Stoichiometry:
Molar masses:
Stoichiometric Masses:
Reacting Masses:
Name__________________________
CH 100
December 04, 2008
120 pts - Fall 2008 - Page 3 of 3
T A __________________________
120 minutes
Final Exam
04 pts 8) If a 20.00 L bomb-reactor contains 22.00 grams of H3CCH2NH2 and 160.00 grams of O2 at 350.0 K
calculate the total pressure on the cylinder?
07 pts 9) Calculate the volume of 0.0480 M hydrochloric acid needed to titrate 30.0 mL of 0.0360 M ammonia
(Kb = 1.8 x 10–5). Write the chemical equation for this reaction:
b) Will the resulting solution be: basic acidic neutral ? Why? ___________________________
____________________________________ . c) Write the equation for the reaction producing the pH
response at the end point.
W
14 pts 10) a) The equilbrium: NH3(aq)
NH+4 (aq) + OH-(aq) in which the [NH3] = 0.12 M and the
[NH4+] = 0.16 M, describe what will happen to 100.0 mL of this solution if 0.002 mole of sodium
hydroxide is added. (Neglect any dilution by the base) _____________________________________
_____________________________________________________________________________(2 pts).
b) Calculate the pH of the above solution before the addition of the base: (6 pts)
c) Calculate the pH of the solution after the addition of the base: (6 pts)
10 pts 11) Write or complete the following Nuclear Reactions:
a) Our sun fuses four hydrogen nuclei to produce one helium nucleus and a lot of energy. Write the net
nuclear equation:
b) The alpha decay of 174Hf:
c) The beta (–) decay of 151Sm:
d) The beta (+) decay of 11C:
e) The electron capture of
63
Zn (zinc-63)