CHM2045C
Module 2 Homework Packet Name:___________
Module Two: ChemMath and Measurement (Chapter 1) (Jespersen)
A.
_____(01) Significant
FiguresSection 1.5 Answers
B.
_____(01) Round Off/Math
of Significant Figures Section 1.5 Answers
C.
_____(01) Scientific
Notation AppendixA.1 pA.1A.4 Answers
D.
_____(01) Metric Numerical
Prefixes T1.5Section 1.4 Answers
D1.
____(01) Metric Basic
UnitsT1.2 / Section 1.4 . Answers
D2.____
(02) Derived
Units: Volume and Measurement Section 1.5 T1.6 Answers
E.
_____(03) Metric System
Conversion FactorsSections 1.6 & 1.7 & 1.9 & 1.11 Answer
F.
_____(05) Unit Analysis
Problems Section 1.6 Answers Pretest #2 Ans2
Online Site
G.
_____(03) Temperature
Conversion Section 1.4 Answers
H.
_____(02) Density/Specific
Gravity Calculations Section 1.7 Answers
_______(20) Total = ______%
Module Two: Homework Packet
Module TwoPart A: Significant figures 1 point
In the
blank, state the number of significant figures in each of the following
measurements:
____1. 0.05 mL
____2. 250.0 cm
____3. 456,000,000 people
_____4. 1000 g
_____5. 0.00006500 moles
_____6.
0.00200 kg
_____7.
50 seconds
_____8.
50.0 Seconds
_____9.
50.00 Seconds
_____10.
0.05 Seconds
Significant Digit Animation:
http://www.lsua.info/chem1001/Chap23Movies/sigdigit.html
Module 2 Pretest Homework Packet
Module TwoPart B: Rounding Off & Arithmetic
Operations of Sign. Figures 1 points
Round
off the following numbers to three significant figures:
(1)
1.598 x 10^{6 }= _____________
(2)
0.000 000 484 500 = _________________
(3) 0.01045 =
_______________
(4) 1.98754 X10^{7} = ________________
Perform the following addition/subtraction/multiplication/division
operations and express the answer using the proper units and significant
figures:
(5) 4
mL
16.3
mL
+ 0.953
mL
(6) 376.5 mL
 76
mL
(7)
16.5 cm
X 1.7 cm
(8) 12.0 g ÷ 1.00 g =
or
12.0 g
/ 1.00 g =
(9)
9.2 cm X
9.20 cm
X 3.14 X 22.65cm
=
(10)
(5398 cm^{3} – 2060.2 cm^{3}) /16.8 cm^{3}/sphere =
Module 2 Pretest Homework Packet
Module TwoPart C: Exponential Numbers and Scientific
Notation 1 point
Express
the following ordinary numbers in scientific notation (If greater than three
significant figures, round off to three significant figures:
(1) 1,010,100,000,000, 000 = ________________
(2) 0.000 000 000 000 019 = ________________
(3) 456,789 = _________________
(4)
0.0001198 = _____________
(5)
1,000,000 = ______________
(6) 0.000200 = ______________
(7)
Express the following
products in exponential form
2 X 2
X 2 X 2 X 2 X 2 X 2 X 2 = ______________
(8)
and use your calculator to calculate the value:
Value
= ___________________
(9) Express the following powers often notation:
1 x 10^{0}
= ______ 1 X 10^{1}=______ 1 x 10^{1} = _________
(10)
Express the ordinary number in scientific notation in three significant
figures:
60,230,000,000,000,000,000,000
= _______________________
Module 2 Pretest Homework Packet
Part D: Metric
System Basic Units/Numerical Prefixes
1 point
Fill in the blank with the proper basic
unit or metric prefix, then in the parenthesis put the unit’s or prefix’s
abbreviation (Use table from Chapter 3):
__________( ) 1.
Metric prefix which means 1/1000 of a unit
__________( ) 2.
Metric prefix which means 1000 units
__________( ) 3.
Metric prefix which means 1/100 of a unit
__________( ) 4. Metric prefix which means 1/10 of a unit
__________( ) 5. Metric prefix which means 1,000,000 units
__________( ) 6. Metric prefix which means 1/1000000 ( 10^{6})
of a unit
__________( ) 7. Metric Prefix which means 1/1000000000 ( 10^{9})
of a unit
Metric Prefix Table:
http://www.lsua.info/MetricSystem/MetricPrefix.html
Metric System Animation:
http://www.lsua.info/chem1001/Chap23Movies/metric.html
Module 2 Pretest Homework Packet
Module TwoPart E
Metric Unit Factors 1 point
Fill in the blank with the number which
completes the metric unit factor:
(1)
__________mg = 1.000 g
(2)
__________mg = 1.000 kg
(3)
__________mL = 1.000 L
(4)
__________cm = 1.000 m
(5)
___________mL = 1.00 cm^{3}
(6)
____________km = 1.000 m
(7) ____________ g =
1 kg
(8) ____________ cm = 1 dm
(9) ___________ µL
= 1 L
(10) __________ nm = 1 m
(11)
Write a unit equation for each of the following metric equvalenets:
(a) M and Tm (b) L and mL (c) Bytes and Gbytes
(a) ______________ (b) ____________ (c)
________________


Module 2 Pretest Homework Packet
Module
TwoPart D1
Metric/SI Systems Basic Units 1 point
Fill in the blank
with the proper basic unit prefix, then in the
parenthesis put the unit’s abbreviation:
__________( ) 1. The basic metric system unit for
measuring Length
__________( ) 2. The basic metric system unit for
measuring Volume
__________( ) 3. The basic metric system unit for measuring Mass (not SI).
__________( ) 4. The basic SI Unit for
measuring Mass.
__________( ) 5.
The basic SI Unit for measuring Length
__________( ) 6. The basic SI Unit for
measuring Temperature.
__________( ) 7. The basic SI Unit for measuring Amount of a Substance.
__________( ) 8. The basic SI Unit for
measuring Time.
__________( ) 9. The basic SI Unit for
measuring Electric Current.
Module
TwoPart D2
Derived Units: Volume and Measurement
1 point
Fill in the blank with the derived quantity
and the Derived Units abbreviation as an example:
(1)
_____________
defines length times length with the abbreviation _______
(2) _____________ defines area times length with abbreviation _______
(3) _____________ defines mass per unit
volume with an abbreviation _______
(4) _____________ defines Speed or
Velocity with an abbreviation:
_______
(5) ______________ defines Change in Speed
per unit of time; abbreviation ______
(6) ______________ defines Mass times
acceleration, with an abbreviation ______
(7) ______________ defines force per unit
area with an abbreviation _______
(8) _______________ defines force times
distance moved, abbreviation:
_______
Module 2 Pretest Homework Packet
Part F: Unit
Analysis Problems 5 points (Work
any 5)
Apply
the unit analysis method of problem solving to each of the following
(setup statement and unit
analysis setup ˝ point,
answer ˝
pt with its proper unit)( If greater than three significant
figures round off to three significant figures): (You must show your
workanswer only zero points)
Problem 1
An oxygen molecule travels 975 mi/hr at room
temperature. There are 5280 ft = 1 mi; 12 in = 1 ft, 2.54 cm = 1 in,
1.6 km = 1 mi, and 3600 sec = 1 hr. What is the velocity in meters per second?
Problem 2
If one gram is equal to 15.4 grains. How many 5.00 grain aspirin tablets may be made from
1.00 kilogram of aspirin?
Problem 3
A parsec
is the distance light travels in 3.26 years. Given the velocity of light, 3.00
x 10^{8} m/sec, how many kilometers does light travel in one parsec?
Problem 4
I have 1400 radio programs I want to put on an
Apple Ipod. Each program requires 5 megabytes of disk space. If
there are 1024 megabytes in a gigabyte. How many gigabytes of disk space
do I need minimum to store all my programs on the IPod. The MiniIpod holds
only 4 gigabytes of recordings, could I use a mini for
my project?
Problem5
Find the mass in grains of a 325
milligram aspirin tablet.
(Given: 1.00 g = 15.4 grains)
Problem6
Insurance statistics state that a person
loses 8 minutes of average life for each cigarette smoked. If there are 20
cigarettes in a pack and the average cost of cigarette is $5.00 per pack over
the next 25 years, how many years of average life would a person lose for
smoking 1.5 packs a day for 25 years?
Problem7
What is the density of water in lb/ft^{3},
if the density of water at 25^{o}C is 1.00 g/ml?
[Hint: There are 2.54 cm = 1 in (or 16.48 cm3
= 1 in^{3}); 454 g = 1 lb ]
Problem8
Calculate the velocity of a car traveling car traveling 65 miles/hr in ft/sec.
Problem9
How many milligrams does a 0.750 carat diamond weigh?
(Hint: 1 carat = 0.200 g)
Problem10
Diamond has a density of 3.513 g/cm^{3}.
The mass of a diamond is often measured in carats, 1 carat equaling 0.200 g.
What is the volume of a 1.50 carat diamond?
Problem11
Liquor used to be sold in fifths. A fifth
is one fifth of a gallon. A gallon is 128 fluid ounces. Today liquor is sold in
bottle sizes of 750 ml to equate to the old fifth. If there are 946 ml in a
quart, calculate the number of milliliters in a fifth. How many milliliters
difference is there in the bottling?
Problem 12
12. On July 23, 1983 Air Canada Flight 143, flying at
26,000 feet from Montreal to Edmonton, ran out of fuel because the first officer ask the mechanic for the conversion factor of mass
to volume at Montreal. The mechanic gave the first officer the answer 1.77 with
no units. The plane had 7682 L of fuel at Montreal. The pilot knew he needed
22,300 kg of fuel to make the trip. The mechanic's answer of 1.77 was pounds per
liter not kilograms per liter caused the error such that only 4917 L of fuel
was added. If there are 2.205 pounds in a kilogram, how many liters of fuel
were needed for the trip? How many liters minimum of fuel should have been
added at Montreal before takeoff?
Problem
13
Before 1982 the US Mint cast penny coins from an alloy of
copper and zinc. A 1980 Penny weighs 3.051 g and contains 2.898 g of pure
copper. In 1982 the US Mint stopped making copper pennies, because the price of
copper was worth more than the penny. The post 1982 penny contains only a layer
of copper over zinc. A 1990 penny weighs 2.554 g and contains 2.490 g of zinc.
If the mint melted down one pound of 1980 pennies, how many 1990 pennies can be
made from the total copper from the 1980 pennies?
Problems
14
An Olympic size swimming pool is 50.0 m long and 25.0 m
wide. How many gallons of water ( d = 1.0g/mL )are
needed to fill the pool to an average depth of 5.5 feet.
Problem
15
A furniture factory
needs 29.5 ft^{2} of fabric to upholster one chair. A Europen supplier
sends the fabric in bolts of exactly 200 m^{2}. What is the maximum
number of chairs that can be upholstered by three bolts of fabric.
Hint: 1 m  3.281 ft)?
Problem 16
My throw
away car gets 23.4 mi/gal and hold 70.1 L of gasoline. How far can I drive on a
tank full of gas?
If gas
cost $3.49/gal; how much does a tankful of gas cost?
If the
average speed on a trip is 92.2 km/hr, How many hours
may I drive the car on the trip before I run out of gas?
Module 2 Pretest Homework Packet
Part G Temperature
Conversion 3 points
The general formula
for the conversion of temperatures on scale X to temperatures on scale Y is:
^{o}Y = ( Y
units/ X units) ( ^{o}X  RP_{x}) + RP_{y}
(You
must show your workanswer only zero points)
1.Write
the formula for the conversion of Fahrenheit to Celsius:
2. Write the formula for the conversion
of Kelvin to Celsius:
3. convert
196^{o}C to ^{o}F
4. convert
196^{o}C to K
5. The Rankin scale uses a Fahrenheit
unit, but assumes zero to be absolute zero.
If absolute zero on the Kelvin scale is zero and on Celsius scale is
273^{o}C, calculate
absolute zero on the Fahrenheit scale, then estimate the Freezing point of
water on the Rankin scale. (The BP water=212^{
o}F=100^{ o}C=373K)
(The Fp of water=32^{ o}F=0^{ o}C=273K)
Module 2 Pretest Homework Packet
Module TwoPart H: Density, Specific Gravity & Volume
Problems 2
points
(You
must show your work—answer only zero points)
1. A
quartz rock was cut into a rectangular solid paperweight. IF the paperweight has a mass of 165 g and
measures 5.00 cm by 5.00 cm by 25.0 mm, what is its volume in cubic
centimeters?
2. Calculate the density in g/mL for 10.0 grams of ethyl ether having a volume
14.0 mL.
3. The
density of air is 1.29 g/L. What is the
volume of 5 kg of air?
4. A
piece of aluminum foil weighs 0.333 grams. If the length is 10.0 cm and width
is 9.00 cm, calculate the thickness of the foil. (Assume the density of
aluminum is 2.70 g/mL)