| Chem 107 |
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Name |
| Fall 1996 |
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Lab Section (circle): Tu Th |
(6) 1. Complete the following table:
| Isotope | A | Z | p | n | e |
| Cl- | 36 | ||||
| 241 | 95 |
a. What is the charge on Group I ions?
b. What is the formula for elemental copper?
c. Name an element occurring as a liquid at room temperature.
d. What charge would you expect for an aluminum ion?
e. What is the formula for elemental iodine?
f. What is the general name for the group VIIA elements?
g. Which element has the highest first ionization energy?
(8) 3. For each of the following compounds determine whether it
is ionic or covalent.
a. NO2 b. CuI2 c. H5C2OH d. SF6
(12) 4. Write Lewis Structures for the following:
a. As b. CO2 c. H2CO3 d. O3
(4) 5. Name the compounds below.
a. CuSO4
b. MnO2
(4) 6. Write formulae for each of the following compounds.
a. Calcium hydroxide
b. Nitric acid
(5) 7. A solution is labeled as containing 20.0% hydrochloric
acid w/w. The density of the solution is 1.0980 g/ml. Calculate
the molarity of this solution. Show work for credit!
(10) 8. a. What volume of 0.550 M NaOH will be required to make
0.500 l of a 0.125 M solution? Show work for credit!
b. What will be the pH and pOH of the resulting solution? Show work for credit!
(10) 9. Calculate the pH of a 0.250 M Hypochlorous acid (HClO)
solution.
(Ka= 3.2 x 10-8)
Show work for credit!
(5) 10. Consider an atmosphere containing nitrogen, oxygen,
carbon dioxide and water vapor in a molar ratio of 0.800 : 0.192
: 0.003 : 0.005. If the total gas pressure is 766 mmHg, what is
the pressure of the nitrogen gas? Show work for credit
(8) 11. What is the percent composition of Iron III sulfate (If
you don't know them, formulae for the ions are on sale for 1pt
each!) Show work for credit
(5) 12. How many atoms of silicon are there in a wafer weighing
0.5230 g? Show work for credit
(10) 13. Draw and label (phases, bp, mp, melting, etc.)
a heating curve for water going from 5 °C to 105 °C
(15) 14. Consider the reaction of zinc metal with acid: Zn + 2H+ Æ
Zn2+ + H2(g)
a. What is the maximum amount (moles) of hydrogen gas which may be produced by reacting 0.50 g of Zinc with excess acid? Show work!
b. What volume will this hydrogen occupy if it is collected at 756 mmHg and 25 °C? Show work for credit !
(6) 15. A cylinder with a tight fitting piston is filled with
a stoichiometric mixture of ethane (C2H6)
and oxygen gases occupying 1.00 liter. Assuming there is no change
in pressure or temperature, what will the final volume be after
the gases react completely? Show work for credit !
(10) 16. A student added 25.0 ml of 0.250 M sodium hydroxide to
50.0 ml of 0.200 M acetic acid and then added water to give a
final volume of 100.00 ml. Find the pH of the final solution.
(For acetic acid, pKa = 4.74) Show work for credit
(15) 17. Define/describe each of the following terms:
a. Colligative property:
b. Brø nsted base:
c. equivalent:
d. Alpha particle (a particle):
e. Le Chatelier's Principle:
(10) 18. Briefly answer the following:
a. consider a pond in equilibrium with the atmosphere. As the temperature of the water rises during the day will the concentration of oxygen in the water increase, decrease or stay the same?
b. A piece of charcoal is found to have 5,060 counts/sec due to carbon fourteen. If the expected number of counts for recent charcoal is 21,180, and the half-life of 14C is 5,700 yrs, how old is the charcoal?
c. Why is water's boiling point so high?
d. If 40.0 moles of water are mixed with 10.0 moles of ethylene glycol (non-volatile & covalent) what will the vapor pressure be at 100.0 °C?
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© R Paselk
Last modified 15 August 2005