CHM 101
GAGE
FALL 2007
NAME _____________________________
September 28, 2007
EXAM 1
Be sure to show all set-up and work to receive credit for problems.
I.
Multiple Choice. Select the best response for each of the following statements or
questions.
(36)
_____1.
Which of the following is a chemical property of iron?
a. Density = 7.874 g/cm3.
b. Iron melts at 1808 K.
_____2.
If you express the number 0.000568 in scientific notation with two significant
figures it would be:
a. 5.7 x 10-3
_____3.
c. Iron corrodes in moist air.
d. Iron is soft when pure.
b. 5.7 x 104
c. Li2+, Ba3+, Ag2+
d. Fe1+, Ba4+, Al2+
A student makes a repeated measurement of the length of an object and obtains
the following data: 34.5 cm, 35.0 cm, 32.6 cm, 32.0 cm, 33.8 cm. The value
measured by an accurate independent source is 35.0 cm. You can say that the
student is:
a. accurate and precise
b. precise but not accurate
_____5.
b. 80 amu
c. 74.92 amu
d. 74.92 g
Which element contains 34 electrons?
a. sulfur
_____7.
c. accurate but not precise
d. neither accurate nor precise
An atom of arsenic contains 47 neutrons. The mass number of the atom is:
a. 47 amu
_____6.
d. 5.7 x 10-4
Some common ions based on metals are:
a. Li1+, Ba2+, Ni2+
b. Li1-, Ca2+, Cu2+
_____4.
c. 5.68 x 10-4
b. silver
c. selenium
d. serinium
Which of the following is a physical change?
a. condensation of alcohol
b. metabolism of glucose
c. release of light by heated Mg
d. addition of Na to water
1
_____8.
Which sample below would contain individual atoms?
a. oxygen gas
b. sodium chloride in water
_____9.
c. white gold
d. water
The nucleus contains:
a. electrons and neutrons only
b. protons and neutrons only
_____10.
c. protons only
d. neutrons only
Vanillin contains 63.15% C, 5.30% H, and 31.55% O whether it is extracted from
vanilla beans, synthesized chemically from clove oils, or extracted from wood
pulp wastes. Vanillin is most likely to be:
a. homogeneous mixture of elements
b. heterogeneous mixture of elements
_____11.
Which of the following property is NOT an intensive property of a material?
a. density
_____12.
c. solution of C in H and O
d. compound of C, O, and H
b. color
c. combustible
d. melting point
e. mass
The statement, "A chemical reaction never creates products that weigh more or
less than the reactants", is based on three centuries of experimental observation.
The statement is an example of:
a. theory
b. hypothesis
II.
a.
FeO
_________________________
c. law
d. belief
Provide the name for each of the following:
S4N2
(12)
____________________________
KMnO4____________________________ (NH4)2HPO4 ________________________
H2SO4 ____________________________
b.
MgF2 _____________________________
Provide the symbols for each of the following:
(12)
phosphorus trihydride________________________ calcium chlorate ___________________
aluminum sulfide ________________________
strontium nitride ___________________
hydrobromic acid __________________________ chromium (III) acetate _________________
2
III.
a.
Write the balanced equation for the reaction represented by the boxes below.
(4)
---------->
_______________________________________________________________________
b.
Balance the following reactions and identify the type of reaction.
Ca(HCO3)2
+

H3PO4
CO2
+
H2O
+
(6)
Ca3(PO4)2
Type: ________________________________
P4
+

Cl2
PCl5
Type: ________________________________
c.
Complete and balance the following reaction:
AgNO3
d.
+
Fe
(4)

Write the ion and net ionic equations for the following reaction:
CaBr2
+
K3PO4

Ca3(PO4)2
3
+ KBr
(6)
IV.
When producing a type of fruit juice the manufacturer needs 6.76 x 10-3 g of sodium
benzoate (a preservative) for each quart of juice. How many pounds of sodium benzoate
would be needed for a vat of 2.1 x 104 gallons.
(10)
454 g = 1 lb
4 qt = 1 gal
V.
The density of water is 1.00 g/mL. What will the mass of 5.0 gallons be in pounds?
454 g = 1 lb
4 qt = 1 gal
952 mL = 1 qt
(10)
4