Test Version A
Unit Exam No. 1 (Chapters 1 – 3)
Dr. Aliño
Spring 2015
Name: _________________________________________
Date: _______________________
Please write the test version on your scantron form.
I.
Writing Chemical Formulas and Naming Compounds. Write the chemical formula and the name of
the compound that results when the ion columns intersect. (4 points each = 48 pts)
NH4+
Br1.
PO335.
N39.
Ba2+
2.
6.
10.
Rb+
3.
7.
11.
H + (acid is formed)
4.
8.
12.
II. Short Answers (4 points each = 28 pts). Calculate the following to the correct number of significant
figures.
1.
Convert 146.1 gallons to mL?
2. A liquid weighs 78.32g for 53.3mL. Calculate its density and determine if this liquid will sink or
float in water. Density of water is 1 g/mL.
3. Convert 47.2 °F to °C. Also find K.
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4. Find the heat needed to heat up 54.5 g chicken soup from 12.2 °C to 189 °C.
௖௔௟
(Specific heat of chicken soup =1.02 ௚ °஼)
5. Find the mass in grams of 65 million (or 6.5 x 107) potassium atoms. A single potassium atom
has a mass of 39.10 amu. (1 amu = 1.660 539 x 10-24 g).
6. For arsenic,
a. Write the full electron configuration.
b. Write the abbreviated electron configuration.
7. (Refer to item II.6)
a. Find the number of valence electrons.
b. Write the Lewis-dot symbol.
III. Multiple Choice. (2 pts each = 24 pts)
1. Solve for x. ‫ = ݔ‬1.2 + 1.23 + 1.234= _________? (correct SF)
a. 3.7
c. 3.67
b. 3.664
d. 3.6
2. Solve for y.
‫=ݕ‬
a. 1.85 x 102
b. 1.9 x 102
ଵ.ଶାଵ.ଶଷାଵ.ଶଷସ
଴.଴ଶ
= _________? (correct SF)
c. 2 x 102
d. 2.0 x 102
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3. The following are examples of homogeneous mixtures except _______.
a. Sugar and water
c. oxygen gas and nitrogen gas
b. Vinegar and oil
d. lemon juice and vodka
4.
What is the valence electron of Group 4A?
a. 2
c. 4
b. 3
d. 5
5. Determine the isotope that has a mass number of 28 and contains 14 electrons?
a. Si – 28
c. Ni – 28
b. Si – 14
d. Ni – 14
6. Which atom is the biggest?
a. C
c. N
b. O
d. F
7. Which atom has the highest ionization energy?
a. C
c. Si
b. Ge
d. Sn
8. Which symbol does not denote a compound?
c. C2H4
a. CO2
b. CCl4
d. F2
9. The prefix “milli” and the prefix “micro” correspond, respectively, to the factors:
a. 103 and 106
b. 10-3 and 10-6
c. 10-3 and 10-12
d. 10-6 and 10-9
10. Which of the following measurements has three significant figures?
a. 1,207 g
c. 4.250 g
b. 0.0250 g
d. 0.03750 g
11. Convert 3502 in3 = ___ft3
a. 291.8 ft3
c. 6.051 x 106 ft3
b. 2.027 ft3
d. 4.202 x 104 ft3
12. Convert 0.045 kg to mg (correct SF)
a. 4.5 x 10-2mg
c. 4.5 x 102 mg
b. 4.5 x 104 mg
d. 4.5 x 10-4 mg
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Conversion Factors, Constants, and Formulas
Volume:
Length:
Mass:
1L = 1.057 qt
1 gal = 4 qt
1 qt = 4 cups
1 in. = 2.54 cm
1 mi = 1.609 km
12 in. = 1 ft
453.6 g = 1 lb
1 kg = 2.205 lb
T°F = 1.8 (T°C) + 32
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