Download CHM134: General Chemistry I

CHM134: General Chemistry I
Exam I: Spring 2009
Name_________________________
Please circle all final answers. For full credit you must report all responses to the correct
number of significant figures. Include units and substances where appropriate. You may
use only the basic arithmetic functions of your calculator.
1. 10 pts. Classify each of the following as an element, a compound, a heterogeneous
mixture, or a homogeneous mixture:
wet sand
gold
fool’s gold
tea
water
Gasoline is easy to burn. Is this a physical or chemical property?
2.
2 pts.
3.
2 pts. Water
4.
10 pts.
density is 1. g/mL. Is this a physical or chemical property?
How many significant figures are in the following numbers?
3.40 x 104 nm ___
76 trombones ___
5.
8 pts.
123.0 g ___
120 cm ___
0.00104 m ___
Perform the following calculations to the correct number of significant figures:
18.5 + 12.456 + 124.78 = ______
45.6 x 3.2 = ______
(37.5 – 33.2) / 2.68 = ______
(37.3 x 0.15) + 96.4 = ______
6.
2 pts.
A race is 2.5 kilometers long. How many centimeters long is this? ____________
7.
2 pts.
My height is 5.7 feet. How many centimeters is this? _____________
8. 4 pts. A room is 6.00 meters long, 3.00 meters high, and 5.00 meters wide, how many
liters of volume does this represent? You must show your work:
9. 4 pts. What is the volume in mL of an object that has a density of 23.7 g/mL and a mass
of 0.487 grams?
10. 4 pts. If a car travels 85 kilometers per hour, how long will it take in seconds to get
from Toronto to Montreal (a distance of 504 km)? Show work:
11.
2 pts.
Write the isotopic symbol for a sodium isotope that has 12 neutrons: _________
12.
6 pts.
A neutral boron-11 atom has ___ protons, ___ neutrons, and ___ electrons.
13.
6 pts.
Give an example of an alkali metal _____, a halogen _____, and a metalloid _____
14.
4 pts.
Calculate the atomic mass of K using the following data. (Show work in table)
Isotope Isotope Mass [amu] Natural Abundance
K-39
38.963707
93.2581 %
K-40
39.963999
0.0117 %
K-41
40.961826
6.7302 %
Atomic mass =
15.
4 pts.
How many actual helium atoms are in a balloon containing 0.34 g of He?
16.
4 pts.
How many moles of oxygen atoms are present in 15.7 grams of carbon dioxide?
17.
4 pts.
How many grams of NaOH must I use if I want 0.2000 mol of NaOH in a flask?
18.
4 pts.
Calculate the mass percent of Ni present in the compound NiSO4
19. 6 pts. What is the empirical formula of a compound that is 34.620 % C, 4.067 % H, and
61.313 % Cl by mass?
20.
6 pts.
Provide a name for each of the following:
KCl
NaClO3
Li2SO4
Cu2O
Co(OH)2
Fe2S3
SnO2
HNO3 (aq)
N2O5
SF6
BF3
HClO2
21.
6 pts.
Provide a formula for each of these names:
calcium iodide
lithium nitrite
sodium phosphate
diboron tetrachloride
hydrocyanic acid
nickel (II) hydroxide
lead (II) chromate
zinc (II) sulfate
hypochlorous acid
carbon dioxide
magnesium oxide
ammonium iodide