Just a reminder, the Chemistry Exam is Tuesday June 17th.
2. A cube has a volume of 3.56 cubic centimeters and a mass
of 15.6 grams. The density of the cube is
best expressed as: (Hint: Answer must have correct number of significant
figures.)
a) 0.228 g/mL b)
4.38 g/mL
c) 0.23 g/mL d)
4.382 g/mL
3. Please indicate the number of significant figures for the
following questions:
4000. g
4000 L
33.0 mL
4.00000000000 m
0.00000000000004 mg
48,067 mg
4. Write the electron configuration for potassium.
5. Who was the father of the Periodic Table?
a)
Gregor Mendel c)
John Dalton
b)
Dmitri Mendeleev d)
Ernest Rutherford
6. List the scientists who discovered the subatomic
particles and their tools.
7. Find the percentage composition of Cu2S.
8. Find the empirical formula of a compound made up of
32.38% sodium, 22.65% sulfur, and 44.99% oxygen.
9. Write the Lewis and structural
formula, the type of bond, and the shape of CCl4.
10. How many grams are there in
8.76 x 1017 molecules of ammonium chlorate?
11. Balance the following
equation: C9H20 +O2 à CO2 + H2O
12. How many moles of AlBr3 are produced if I
have 700. grams of Br2, according to the following equation?
Al
+ Br2 à
AlBr3 (unbalanced)
13. If the pressure of a gas is 4364.333 kPa, what is the
gas in atm?
a)
4364.333 atm c)
3.316893 x 106 atm
b)
5.742543 atm d)
43.07262 atm
14. A sample of hydrogen gas occupies a volume of 562 mL at
17oC. What would the volume be if the temperature was increased to
31oC?
15. What is the mass, in kilograms, of 17.8 L of Chlorine
gas at STP?
16. Which principle describes the process of a system to
counter a stress made upon it so that the system can return to equilibrium?
a)
Heisenberg’s Principle c)
Le Chatelier’s Principle
b)
Einstein Principle d)
Equilibrium Principle
17. A solution was prepared using 42.3 g of sugar, C12H22O11,
mixed with 444 g of water. Find the molal concentration of the solution.
18. ***Three part question*** 9.12 L of H2 reacts
with CuO at STP according to the following equation:
CuO
+ H2 à
Cu + H2O
How many moles of H2 react? How many moles of Cu
are produced? How many grams of Cu are produced?
19. C6H12O6 + 6O2
⇌ 6CO2 + 6H2O
+ heat
If
heat was removed to the system above, how would the system react?
a) Shift to the Right c) Stay
the Same
b) Shift to the Left
20.
Why can’t water dissolve oil? What quote did we mention to help
determine when a substance will dissolve another substance?
21. For the following equations, please complete the
following. A) Determine the products. B) List each element as soluble or
insoluble (you can simply put aq or s next to each compound). C) Write the
total ionic equation. D) List the spectator ions. E) Write the net ionic
equation.
sodium carbonate + calcium chloride
22. List the definition of an Arrhenius acid and base,
Bronsted-Lowry acid and bas, and Lewis acid and base. I would prefer a chart.
23. What is
the pH of a solution whose hydronium ion concentration is 3.30
x 10-12?
a) 12.0 b) 11.5
c) 12.5 d) 2.5
24. A 6.7 g
sample of a plastic was heated from 256 K to 279 K and absorbed 49 J of energy
as heat. What is the specific heat of the plastic?
25. For the
reaction: C (s) + O2 (g) à CO2 (g) + 401.24 kJ at 301 K, ∆S= 0.544 kJ/(mol x K).
Will this reaction occur?
26. For
the following equation, please list the oxidation numbers of each element, then
break up into the proper oxidation/reduction reaction with the proper number of
electron either gained or lost. Write neatly or else points will be taken off
for things I cannot read!
3
Cu + 2 HNO3 + 6 H+ → 3 Cu2+ + 2 NO + 4 H2O
27. For this question, please list given, the K formula (without
numbers), show all work (with numbers) and the answer.
For the
following equilibrium equation: 4HCl + O2 ⇌ 2Cl2 + 2H2O
at 650oC, K= 83.4, [HCl]= 5.1 x 10-2 mol/L; [O2]=
3.0 x 10-2 mol/L; and [H2O]= 9.1 x 10-3 mol/L.
What is the concentration of Cl2?
28.
Draw the following compound: 3-ethylheptane
