scientific notation units of measurement significant figures conversion calculations density...
TRANSCRIPT
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Scientific NotationUnits of Measurement
Significant FiguresConversion Calculations
Density
Chapter 2: Measurement
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Scientific Notation
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If a number is larger than 1
• Move decimal point X places left to get a number between 1 and 10.
Scientific notation
1 2 3 , 0 0 0 , 0 0 0.
• The resulting number is multiplied by 10X.
= 1.23 x 108
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If a number is smaller than 1•Move decimal point X places right to get a number between 1 and 10.
Scientific notation
0. 0 0 0 0 0 0 1 2 3 = 1.23 x 10-7
• The resulting number is multiplied by 10-X.
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Write in Scientific Notation:
25 =
8931.5 =
0.000593 =
0.0000004 =
3,210. =
Examples
2.5 x 10 1
8.9315 x 10 3
5.93 x 10 - 4
4 x 10 - 7
3.210 x 103
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x 10
1.44939 x 10-2 =
Scientific notation
+
-1
/
x
0
2 3
4 5 6
7 8 9
.
CE
EE
log
ln
1/x
x2
cos tan
1.44939 E-2
0.0144939
On Calculator 1.44939 (-) 2EE
Means x 10 Change
Sign
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Chapter 2 Measurements
2.1Units of Measurement
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Units are important
Measurements in chemistry
has little meaning, just a number
has some meaning - money
more meaning - person’s salary
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Metric SI CommonConversions
Length
Units of Measurement
meter (m) meter (m)
1 m = 1.09 yd2.54 cm = 1 in
1 m = 100 cm = 1000 mm
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Metric SI CommonConversions
Length
Volume
Units of Measurement
meter (m) meter (m)
1 m = 1.09 yd2.54 cm = 1 in
1 m = 100 cm = 1000 mm
liter (L) cubic meter (m3)
1 L = 1.06 qt
946 mL = 1 qt
1 L = 1000 mL
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Metric SI CommonConversions
Length
Volume
Mass
Units of Measurement
meter (m) meter (m)
1 m = 1.09 yd2.54 cm = 1 in
1 m = 100 cm = 1000 mm
liter (L) cubic meter (m3)
1 L = 1.06 qt
946 mL = 1 qt
1 L = 1000 mL
gram (g) Kilogram (kg)1 kg = 2.20 lb
1 kg = 1000 g
454 g = 1 lbCH104 19
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The amount of material in an object Mass:Mass (in g’s) of
a 1L Bowling Ball > a 1 L Balloon
Weight:
Mass Vs. Weight
Pull of Gravity on an object.
Weight of Person on Earth > Person on Moon
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Mass Vs. Weight
How much would you weigh on another planet?
http://www.exploratorium.edu/ronh/weight/
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Metric SI CommonConversions
Length
Volume
Mass
Time
Temp
Units of Measurement
meter (m) meter (m) 1 m = 1.09 yd 2.54 cm = 1 in
liter (L) cubic meter (m3)
gram (g) Kilogram (kg) 1 kg = 2.20 lb
1 L = 1.06 qt
946 mL = 1 qt
Celsius (oC) Kelvin (K) oC = (oF-32)/1.8 K = oC + 273
second (s) second (s) 60 s = 1 min
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For each of the following, indicate whether the unit describes
1) length, 2) mass, or 3) volume.
____ A. A bag of tomatoes is 4.5 kg.
____ B. A person is 2.0 m tall.
____ C. A medication contains 0.50 g of aspirin.
____ D. A bottle contains 1.5 L of water.
23
Learning Check
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For each of the following, indicate whether the unit describes
1) length, 2) mass, or 3) volume.
____ A. A bag of tomatoes is 4.5 kg.
____ B. A person is 2.0 m tall.
____ C. A medication contains 0.50 g of
aspirin.
____ D. A bottle contains 1.5 L of water. 24
Solution
1
2
2
3
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Identify the measurement that has an SI unit.
A. John’s height is _____.1) 1.5 yd 2) 6 ft 3) 2.1
m
B. The race was won in _____. 1) 19.6 s 2) 14.2 min 3)
3.5 h
C. The mass of a lemon is _____.1) 12 oz 2) 0.145 kg 3)
0.62 lb
D. The temperature is _____.1) 85 °C 2) 255 K 3) 45
°F25
Learning Check
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Solution
CH104
Identify the measurement that has an SI unit.
A. John’s height is _____.1) 1.5 yd 2) 6 ft 3) 2.1
m
B. The race was won in _____. 1) 19.6 s 2) 14.2 min 3)
3.5 h
C. The mass of a lemon is _____.1) 12 oz 2) 0.145 kg 3)
0.62 lb
D. The temperature is _____.1) 85 °C 2) 255 K 3) 45
°F
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2.2Measured Numbers
and Significant Figures
27
Chapter 2 Measurements
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Measured & Exact Numbers
Exact Numbers = from counting or by definition
12 coins per package12 coins per package
12 coins 1 package
12 coins 1 package
1 package12 coins
1 package12 coins=
12 coins 1 dozen coins 12 coins
1 dozen coins 1 dozen coins
12 coins 1 dozen coins
12 coins=
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Examples of Exact Numbers
from numbers in a defined relationship
when objects are counted
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Measured & Exact Numbers
Measured Numbers = estimated using a tool
All measurements contain some uncertainty.
•We make errors
•Tools have limits
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Length of object is between 6.7 and 6.8The next digit would be a guess.
Significant figures
If use 6.76 then have error of + 0.01cm and have 3 significant figures.
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Expresses accuracy & precision.
You can’t report values more accurate than the methods of measurement used .
6.76 units = 3 significant figures
Significant figures
Certain Digits
UncertainDigit
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We can estimate the value to be 8.45 mL but cannot be more accurate than that.
8.45 has 3 sig figs.
Significant figuresMeniscus is between
8.4 and 8.5The next digit would
be a guess.
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Sig Figs don’t depend on the decimal point.
255 millimeters 25.5 centimeters 2.55 decimeters 0.255 meters 0.0255 decameters
Significant figures
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Significant figures: Rules for zeros
0.00421 Leading zeroLeading zero
Captive zeros are significant. 4012
Trailing zeros behind decimal are significant.114.20
Captive zeroCaptive zero
Trailing zeroTrailing zero
Leading zeros are not significant.3 sig figs
4 sig figs
5 sig figs
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32,000Are the 0’s significant?
2 sig figs =
3 sig figs =
4 sig figs =
5 sig figs =
Significant figures: Rules for zeros
3.2 x 104
3.20 x 104
3.200 x 104
3.2000 x 104
32,000.CH104 40
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1025 km
2.00 mg
0.00570
520
Significant figures: Rules for zeros
Three (only trailing zero behind decimal
is significant, leading zeros are not)
Four (Captive zeros are significant)
Three (trailing zeros behind decimal
are significant)
Two (No decimal, zero assumed insignif)
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In scientific notation:All digits, including zeros in the coefficient, are
significant.
Scientific Notation Number of Significant
Figures___________8 x 104 m8.0 x 104 m8.00 x 104 m
42
Significant Figures inScientific Notation
123
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State the number of significant figures in each of the following measurements:
A. 0.030 m
B. 4.050 L
C. 0.0008 g
D. 2.80 m43
Learning Check
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State the number of significant figures in each of the following measurements:
A. 0.030 m
B. 4.050 L
C. 0.0008 g
D. 2.80 m
44
Solution
2
4
1
3
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Learning Check
CH104
A. Which answer(s) contains 3 significant figures?1) 0.4760 2) 0.00476 3) 4.76 x 103
B. All the zeros are significant in
1) 0.00307 2) 25.300 3) 2.050 x 103
C. The number of significant figures in 5.80 x 102 is1) one 3) two 3) three
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Solution
CH104
A. Which answer(s) contains 3 significant figures?1) 0.4760 2) 0.00476 3) 4.76 x 103
B. All the zeros are significant in
1) 0.00307 2) 25.300 3) 2.050 x 103
C. The number of significant figures in 5.80 x 102 is1) one 3) two 3) three
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Classify each of the following as exact (E) or measured (M) numbers. Explain your answer.
A. __ Gold melts at 1064 °C.
B. __ 1 yard = 3 feet
C. __ The diameter of a red blood cell is 6 x 10-4 cm.
D. __ There are 6 hats on the shelf.
E. __ A can of soda contains 355 mL of soda.
51
Learning Check
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52
Solution
M
M
M
E
E
CH104
Classify each of the following as exact (E) or measured (M) numbers. Explain your answer.
A. __ Gold melts at 1064 °C.
B. __ 1 yard = 3 feet
C. __ The diameter of a red blood cell is 6 x 10-4 cm.
D. __ There are 6 hats on the shelf.
E. __ A can of soda contains 355 mL of soda.
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Chapter 2 Measurements
2.3Significant Figures in
Calculations
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Write with 4 Significant Figures:
2.579 035
Rounding
1st insignificant digit1st insignificant digit
34.20 221 becomes 34.20
becomes 2.5805
4
> 5 round up
< 5 round down.
> 5 round up
< 5 round down.
Sometimes a calculated answer shows too many significant digits so we need to round.
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41.50.212
Adding Significant ZerosSometimes a calculated answer requires more significant digits so we need to add zeros.
Calculated answer
Zeros added to give 3 significant figures
4.00
1.50
0.200
12.0
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Adjust the following calculated answers to giveanswers with three significant figures.
A. 824.75 cm
B. 0.112486 g
C. 8.2 L
56
Learning Check
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Adjust the following calculated answers to giveanswers with three significant figures.
A. 824.75 cm
B. 0.112486 g
C. 8.2 L
Solution
First digit dropped is greater than 4.
825 cm
First digit dropped is 4.0.112 g
Significant zero is added.8.20 L
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An answer can’t have greater significance than the quantities used to produce it.
Significant figuresand calculations
speed = 1.00 km 3.0 min
+
-1
/
x
0
2 3
4 5 6
7 8 9
.
CE
EE
log
ln
1/x
x2
cos tan
0.3333333333
= ?
Example How fast did you run if youwent 1.00 km in 3.0 minutes?
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Multiplication & Division Problems:Do calculations.
Simplified rules for significant figures
•Look at sig figs for each value in calculation. (Constants don’t count.)
•Report answer with same sig figs as least significant value.
•Round off as needed.
speed = 1.00 km 3.0 min
= 0.333333333 km min
= 0.33 km min
2 sig figs
3 sig figs
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Simplified rules for significant figuresAddition & Subtraction Problems:• Do calculations.
•Look at least significant place for each value in calculation.
•Report answer to least significant place.
•Round off as needed.
1.9+ 18.65 20.55
= 20.6
Significant to .1
Significant to .01
Significant to .1
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(1.9 + 18.65 ) =2.153
Add & Sub mixed w/ Mult & Div Problems:
( 20.55 ) = 2.153
• Do Addition & Subtraction calculations 1st.
• Make note of the least significant place.
3 sig figs (after addition)
4 sig figs
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• Do Multiplication & Division calculations.
9.54482118
• Round to least # sig fig.
9.549.54
(1.9 + 18.65 ) =2.153
( 20.55 ) = 2.153
3 sig figs (after addition)
Add & Sub mixed w/ Mult & Div Problems:
4 sig figs
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Chapter 2 Measurements
2.4Prefixes and Equalities
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A prefix in front of a unit increases or decreases the size of that unit by one or more factors of 10
indicates a numerical value
Prefix Value1 kilometer = 1000 meters1 kilogram = 1000 grams
69
Prefixes
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Metric prefixesPrefix
(Symbol)Factor
(multiple)Common
Conversion
mega (M)
kilo (k)
deci (d)
centi (c)
milli (m)
micro (m)nano (n)
1,000,000 = (106) 1Mm = 1,000,000 m
1,000 = (103) 1km = 1,000 m
0.1 = (10-1) 1m = 10 dm
0.01 = (10-2) 1m = 100 cm
0.001 = (10-3) 1m = 1,000 mm0.000001 = (10-6) 1m = 1,000,000 mm
0.000,000,001 = (10-9) 1m = 1,000,000,000 nm
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Indicate the unit that matches the description:1. a mass that is 1000 times greater than 1 gram
1) kilogram 2) milligram 3) megagram
2. a length that is 1/100 of 1 meter 1) decimeter 2) centimeter 3) millimeter
3. a unit of time that is 1/1000 of a second 1) nanosecond 2) microsecond 3) millisecond
Learning Check
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Solution
= 0.01 of 1 meter
= 0.001 of a sec
CH104 74
Indicate the unit that matches the description:1. a mass that is 1000 times greater than 1 gram
1) kilogram 2) milligram 3) megagram
2. a length that is 1/100 of 1 meter 1) decimeter 2) centimeter 3) millimeter
3. a unit of time that is 1/1000 of a second 1) nanosecond 2) microsecond 3) millisecond
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Select the unit you would use to measure A. your height
1) millimeters 2) meters 3) kilometers
B. your mass 1) milligrams 2) grams 3) kilograms
C. the distance between two cities 1) millimeters 2) meters 3) kilometers
D. the width of an artery 1) millimeters 2) meters 3) kilometers
Learning Check
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Solution
CH104 76
Select the unit you would use to measure A. your height
1) millimeters 2) meters 3) kilometers
B. your mass 1) milligrams 2) grams 3) kilograms
C. the distance between two cities 1) millimeters 2) meters 3) kilometers
D. the width of an artery 1) millimeters 2) meters 3) kilometers
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States the same measurement in two different units
Metric Equalities
Length: 1 meter is the same as 100 cm or 1000 mm.1 m = 100 cm
1 m = 1000 mm
Volume: 1 L is the same as 1000 cm3.1 L = 10 cm X 10cm X 10 cm
1 L = 1000 mLMass: 1 kg = 1000 g
1 g = 1000 mg1 mg = 0.001 g1 mg = 1000 µg
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Indicate the unit that completes each of the followingequalities:
A. 1000 m = 1) 1 mm 2) 1 km 3) 1dm
B. 0.001 g = 1) 1 mg2) 1 kg 3) 1dg
C. 0.1 s = 1) 1 ms 2) 1 cs 3) 1ds
D. 0.01 m = 1) 1 mm 2) 1 cm 3) 1dm
Learning Check
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Indicate the unit that completes each of the followingequalities:
A. 1000 m = 1) 1 mm 2) 1 km 3) 1dm
B. 0.001 g = 1) 1 mg2) 1 kg 3) 1dg
C. 0.1 s = 1) 1 ms 2) 1 cs 3) 1ds
D. 0.01 m = 1) 1 mm 2) 1 cm 3) 1dm
Solution
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Chapter 2 Measurements
2.5Writing Conversion Factors
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See Handout Sheet of Common conversion factors
&Handout of
Conversion Problems
Measurements in chemistry
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Some Common Equalities
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Write equalities and conversion factors for each pair of units:A. liters and mL
B. hours and minutes
C. meters and kilometers
85
Learning Check
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Write equalities and conversion factors for each pair of units:A. liters and mL
B. hours and minutes
C. meters and kilometers
86
Solution
Equality: 1 L = 1000 mL
1 L and 1000 mL 1000 mL 1 L
Equality: 1 hr = 60 min 1 hr and 60 min
60 min 1 hr
Equality: 1 km = 1000 m
1 km and 1000 m
1000 m 1 kmCH104
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Write the equality and conversion factors for each of the following:A. meters and centimeters
B. jewelry that contains 18% gold
C. one liter of gas is $ 0.95
87
Learning Check
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Write the equality and conversion factors for each of the following:A. meters and centimeters
B. jewelry that contains 18% gold
C. one liter of gas is $ 0.95
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Solution
1 m and 100 cm 100 cm 1 m
18 g gold and 100 g jewelry100 g jewelry 18 g gold
1 L and $0.95 $0.95 1 L
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Chapter 2 Measurements
2.6Problem Solving
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Example: Metric Conversion How many milligrams (mg) are in 5 kilograms (kg)?
Factor label methodIdentify your conversions factors.
Conversion of units
1 kg = 11000 g
1000 g = 11 kg
1 g = 11000 mg
1000 mg = 11 g
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• Identify what is to the problem.
• Identify how you want the answer to look.
5 kg = mg
Example: Metric Conversion How many milligrams are in 5 kilograms?
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• Multiply by conversion factors until units cancel.
• If the words work, the numbers will work.
5 kg
1
= mg1000 g
1 kg
1000 mg
1 g
5,000,000
Example: Metric Conversion How many milligrams are in 5 kilograms?
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Example: English-Metric Conversion
You have a pen of rats each with an average weight of 0.75 lb. How many mg rubbing alcohol will it take to kill ½ of the population if theLD50 is 5000. mg/kg ?
• Identify your conversions factors.
1 kg Bw = 15000 mg Alc
5000 mg Alc = 11 kg Bw
1.0 kg Bw = 12.2 lb Bw
2.2 lb Bw = 11.0 kg Bw
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0.75 lbBW
Example: English-Metric Conversion
You have a pen of rats each with an average weight of 0.75 lb. How many mg rubbing alcohol will it take to kill ½ of the population if theLD50 is 5000. mg/kg ?
1.0 kgBW
2.2 lbBW
5000. mgAlc
1 kg BW= mgAlc 1704.545
1700 mg = 1.7 x 103
Identify what is unique to the problem.
Identify how you want the answer to look.
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Given (unique) = 1.60 days
Needed unit = ? min
Plan = days hours min
Example:How many minutes are 1.60 days?
Set up problem to cancel hours (h). 1.60 days x 24 hrs x 60 min = 1 day 1 hr
3 SigFigs Exact Exact = 3 SigFigs
2300 min = 2.3 x 103
2304 min
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13 males x 100 = 37.1429 %
35 Students
PercentagesPart x 100 =Whole
%
___100
Secret code for
37% male
CH104110
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Percentages as Conversion FactorsExample: The population of the automotive repair course is 37% male. Of the 75 students in the class how many are men?
Secret code for
37% male = 37 male 100 students
100 students 37 male
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• Identify your conversions factors.
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= males
Percentages as Conversion FactorsExample: The population of the automotive repair course is 37% male. Of the 75 students in the class how many are men?
• Identify what is to the problem.
• Identify how you want the answer to look.
75 students
1
37 males
100 students27.75
28 males
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=
100 mL
10 % Alcohol
PercentagesPart x 100 =Whole
%
___100
Secret code for
10 mL Alcohol
Solution
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Percentages as Conversion FactorsExample: An athlete normally has 15 % body fat. How many lbs of fat does a 74 kg athlete have?
Secret code for
15% Body Fat = 15 lb Fat 100 lb BW
100 lb BW 15 lb Fat
CH104 116
• Identify your conversions factors.
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2.2 lbBw
1.0 KbBw= lb fat
Percentages as Conversion Factors
• Identify what is to the problem.
• Identify how you want the answer to look.
74 KgBw
24.42
24 lb fat
Example: An athlete normally has 15 % body fat. How many lbs of fat does a 74 kg athlete have?
15 lb Fat 100 lb BW
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Learning Check:If the thickness of the skin fold at the waist indicates an 11% body fat, how much fat is in a person with a mass of 86 kg?
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Solution:
11% body fat means 11 kg fat 100 kg
86 kg x 11 kg fat = 9.5 kg of fat 100 kg
If the thickness of the skin fold at the waist indicates an 11% body fat, how much fat is in a person with a mass of 86 kg?
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2.7Density
120
Chapter 2 Measurements
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Water 1.0 Urine 1.01 - 1.03Air 0.0013 Bone 1.7 - 2.0Gold 19.3 Gasoline 0.66 - 0.69
DensityDensity =
Mass
Volume
1cc = 1 cm3 = 1 ml = 1 g water 1cc = 1 cm3 = 1 ml = 1 g water
g cm3
g mlor At 4 o C
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Example.Density calculation
What is the density of 5.00 ml of serum if it has a mass of 5.230 grams?
d = m V
d = 5.230 g 5.00 ml
= 1.05 g ml
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Osmium is a very dense metal. What is its density in g/cm3 if 50.0 g of osmium has a volume of 2.22 cm3?
1) 2.25 g/cm3
2) 22.5 g/cm3
3) 111 g/cm3
124
Learning Check
CH104
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Given: mass = 50.0 g ,volume = 22.2 cm3
Need: Density
D = mass = 50.0 g volume 2.22 cm3
Calculator = 22.522522 g/cm3
Final answer (2 SF) = 22.5 g/cm3
Solution
CH104 125
Osmium is a very dense metal. What is its density in g/cm3 if 50.0 g of osmium has a volume of 2.22 cm3?
1) 2.25 g/cm3
2) 22.5 g/cm3
3) 111 g/cm3
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A solid completely submerged in water displaces its own volume of water.The volume of the solid is calculated from the volume difference.Volume of solid = 45.0 mL – 35.5 mL = 9.5 mL = 9.5 cm3
128
CH104
The density of the zinc object is calculated from its mass and volume. mass = 68.60 g = 7.2 g/cm3 volume 9.5 cm3
Density Using Volume Displacement
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What is the density (g/cm3) of 48.0 g of a metal if the level of water in a graduated cylinder rises from 25.0 mL to 33.0 mL after the metal is added?
1) 0.17 g/cm3 2) 6.0 g/cm3 3) 380 g/cm3
Learning Check
CH104 129
33.0 mL
25.0 mL object
25.0 mL
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Given: 48.0 g Volume of water = 25.0 mL
Volume of water + metal = 33.0 mL
Need: Density (g/cm3 )
Volume of metal = 33.0 mL – 25.0 mL = 8.0 mL
8.0 mL x 1 cm3 = 8.0 cm3
1 mLSet up problem:
Density = 48.0 g = 6.0 g = 6.0 g/cm3
8.0 cm3 1 cm3 (2 SF)
Solution
CH104 130
What is the density (g/cm3) of 48.0 g of a metal if the level of water in a graduated cylinder rises from 25.0 mL to 33.0 mL after the metal is added?
1) 0.17 g/cm3 2) 6.0 g/cm3 3) 380 g/cm3
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Sink or FloatIce floats in water because the density of ice is less than the density of water. Aluminum sinks in water because its density is greater than the density of water.
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Which diagram correctly represents the liquid layers in the cylinder? Karo (K) syrup (1.4 g/mL), vegetable (V) oil (0.91 g/mL), water (W) (1.0 g/mL)
1 2 3
Learning Check
K
K
W
W
W
V
V
V
K
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1)
vegetable oil (0.91 g/mL)
water (1.0 g/mL)
Karo syrup (1.4 g/mL)
133
Solution
K
W
V
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Density as a ConversionA liquid sample with a density of 1.09 g/mL is
found to weigh 7.453 grams. What is the volume of the liquid in mLs?
A liquid sample with a density of 1.09 g/mL is found to weigh 7.453 grams. What is the volume of the liquid in mLs?
1.09 g1 ml
1 ml1.09 g
• Identify any conversion factors.
•How should the answer look?
7.453 g = ml
• What is unique to the problem?
1 ml1.09 g
6.837614 = 6.84 ml
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If olive oil has a density of 0.92 g/mL, how many liters of olive oil are in 285 g of olive oil?
1) 0.26 L 2) 0.31 L 3) 310 L
Learning Check
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Given: D = 0.92 g/mL mass = 285 g
Need: volume in L
Plan: g mL L
Equalities: 1 mL = 0.92 g 1 L = 1000 mL
Set up: 285 g x 1 mL x 1 L = 0.31 L
0.92 g 1000 mL density metric
factor factor
SolutionIf olive oil has a density of 0.92 g/mL, how many liters of olive oil are in 285 g of olive oil?
1) 0.26 L 2) 0.31 L 3) 310 L
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Specific Gravity =
Specific gravitydensity of substance g
mldensity of reference g
ml
Referencecommonly
water at 4oC
•Specific Gravity is unitless.
•density = specific gravity (if at 4oC)
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Specific gravity
•Commonly used to test sugar in urine.
Hydrometer
• Float height will be based on Specific Gravity.