Download Sample Exam 1

Sample Exam #1
Part One: Multiple Choice – circle one answer only.
1. When methane is burned with oxygen, the products are carbon dioxide and water. If
you produce 36 g of water and 44 grams of carbon dioxide from 16 grams of
methane, how many grams of oxygen were needed for the reaction?
a) 64 g
b) 80 g
c) 32 g
d) 96 g
2. Which of the following is not composed of chemicals?
a) air
b) water
c) paint thinner
d) toilet paper
e) all of the above are composed of chemicals
3. Which of the following is a Type I binary ionic compound?
a) NaCl
b) FeCl3
c) CO2
d) All of the above
e) None of the above
4. Which of the following is a theory?
a) When a can of soda pop is opened, a fizzing sound is heard.
b) A body in motion stays in motion unless acted upon by a force.
c) If oil and water are combined, the oil floats on top of the water.
d) Chemical bonds are the result of overlapping atomic orbitals.
e) None of the above.
5. Which of the following is used to convert Fahrenheit to Celsius?
a) ºC = ºF +273
b) ºC = F – 32
1.80
c) ºC = ºF – 273
d) ºC = ºF(1.80) + 32
6. How does the amount of energy needed to heat a sample of water from 15 ºC to 45 ºC
compare to that needed to heat this sample from 50 ºC to 80 ºC ?
a) more energy is needed to go from 15 ºC to 45 ºC.
b) it depends on the size of the sample
c) the same amount of energy is involved
d) more energy is needed to go from 50 ºC to 80 ºC
Part Two: Short Answer
7. Describe the composition of an atom.
8. Explain the difference between a theory, law, and observation.
9. Express the following number in scientific notation and write the correct number of
significant figures.
0.00000007850 m
10. Give the names of the following compounds:
a) NaC2H3O2
__________________
b) SO4
__________________
c) HgCl2
__________________
d) Co2S3
__________________
11. Classify each of the following as an alkali metal, alkaline earth metal, halogen, or
noble gas.
a) barium
_________________
b) krypton
_________________
c) potassium
_________________
d) chlorine
_________________
12. What are the A and Z terms of the following elements?
a) Rn-222
A: _______ Z:_________
b) Ag-108
A: _______ Z:_________
c) Rb-85
A: _______ Z:_________
d) Mg-25
A: _______ Z:_________
13. Fill in the blanks to complete the table.
Symbol
Mass # # Protons # Neutrons
35
Cl 138
14
32 2S
32
16
# Electrons
Charge
54
13
18
2+
0
Part Three: Calculations – show all work.
14. Perform the following calculations to the correct number of significant figures.
a) 83.5 + 7.212 + 1.2 + 400.34
b) 82.1 x 103 ÷ 75.829 + 218.39
c) 3.11 ÷ 7.65
d) 3.2 x 0.02040 x 0.599
15. Ethylene glycol (antifreeze) has a density of 1.11g/cm3.
a) What is the mass in grams of 417 mL of this liquid?
b) What is the volume in liters of 4.11 g of this liquid?
16. Calculate the formula mass of iron (III) nitrate to 3 significant figures.
17. A chemistry student finds a heavy piece of rock that she suspects is lead. She weighs
the rock on a balance and obtains a mass of 27.6g. The temperature of the rock rises
from 27ºC to 48ºC upon absorption of 208 J of heat. What is the heat capacity of the
substance? Is this substance lead (heat capacity = 0.128 J/g ºC)?