Drill: Classify each:

1
Drill Classify each

• Filtered Sea water
• Orange juice
• Mercury
• Salt
• Pure ice water

2
Review Drill,Grade HW Collect Both
3
CHM II HW

• Review PPs 1 4
• Work the attached assignment turn it in
  tomorrow.

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Accuracy

• How close you are to the real answer

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Precision

• How well one can repeat his or her work
• Repeatability

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Uncertainty

• All measurements have a degree of unreliability
• Usually in the last digit of a measurement

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Burette Measurements Each measurement should
have 2 decimals
Solve the correct reading for the volume in
the burette
0
1
2
3
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Burette Measurements Each measurement should
have 2 decimals
1.36 the last decimal will have uncertainty
0
1
2
3
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Significant Digits

• Meaningful digits in a number

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Determining Significance

• All non-zero digits
• All zeros between non-zero numbers
• All trailing zeros if there is a decimal place

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Multiplication Uncertainty

• The answer should have the same number of
  significant digits as the multiplier with the
  least number of SD
• Same for division

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Addition Uncertainty

• When adding, line up decimal place add
• The decimal places in the answer should the
  least
• Same for subtraction

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Scientific Notation

• M x 10n
• M 1.00 ? M lt 10.00
• n an integer

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Basic Units

• Length meters
• Mass kilograms
• Time seconds

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• Temperature Kelvin
• Amount Chm Mole
• Current Ampere
• Luminous In Candela

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MetricPrefixes

• Giga (G)
• Mega(M)
• Kilo(k) Nano(n)
• Milli(m)
• Micro(m) Centi(c)

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MetricPrefixes

• (G) 109
• (M) 106
• (k) 103 (n) 10-9
• (m) 10-3
• (m) 10-6 (c) 10-2

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Conversion Factor

• Ratio equal to one
• 12 inches/1 foot 1
• Multiply one unit by a conversion to obtain
  another unit w/o affecting magnitude

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Convert 40.0 ft to inches
40.0 ft 12 in ft

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Convert 40.0 ft to inches
40.0 ft 12 in ft

480 inches
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Convert

• 2.50 cm to Mm
• 4.2 ns to ms
• 3.15 kg to mg

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Convert
2.50 cm 10-2m Mm cm 106m
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Convert
2.50 cm 10-2m Mm cm 106m
2.50 x 10-8 Mm
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Convert
4.2 ns 10-9s ms ns 10-3s
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Convert
4.2 ns 10-9s ms ns 10-3s
4.2 x 10-6 ms
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Convert
3.15 kg 103g mg kg 10-6g
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Convert
3.15 kg 103g mg kg 10-6g
3.15 x 109 mg
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Convert4.35 kg/L to mg/mL2.31 mm/ns to cm/Ms
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4.35 kg 103g mg 10-6L L kg
10-3g mL
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4.35 kg 103g mg 10-6L L kg
10-3g mL 4.35 mg/mL
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2.31 mm 10-3 m cm ns mm
10-2 m ns 106 s 10-9 s Ms
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2.31 mm 10-3 m cm ns mm 10-2
m ns 106 s 10-9 s Ms
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2.31 x 1014 cm/Ms
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Calculate the volume in m3 occupied by 750 kg of
gas with 1.50 g/L1 cm3 1 mL
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Calculate the mass in kg of a board that has
dimensions of 250 mm x 4.0 x 104 mm x 2.5 m and
had a density of 0.80 g/mL1 ml 1 cm3
36
Calculate the density in g/mL of a 3.14 x 103 kg
cylinder that 5.0 m long has a diameter of 2.0
m.
37
How many nm will an object travel in 1/132 ks
at 720 miles per hour 1 inch 2.54 cm 1 mile
5280 ft
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Determine the length in miles of a light year

• Light year distance light travels in one year
• c 3.0 x 108 m/s
• 1 mile 5280 ft
• 1 inch 2.54 cm