Drill: Classify each: Filtered Sea water Orange juice Mercury Salt Pure ice water

Review Drill, Grade HW & Collect Both

CHM II HW Review PPs 1 – 4 Work the attached assignment & turn it in tomorrow.

Accuracy How close you are to the real answer

Precision How well one can repeat his or her work Repeatability

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

Burette Measurements Each measurement should have 2 decimals Solve the correct reading for the volume in the burette

Burette Measurements Each measurement should have 2 decimals ~ 1.36 the last decimal will have uncertainty

Significant Digits Meaningful digits in a number

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

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

Addition Uncertainty When adding, line up decimal place & add The decimal places in the answer should = the least Same for subtraction

Scientific Notation M x 10 n M = 1.00  M < n = an integer

Basic Units Length meters Mass kilograms Time seconds

TemperatureKelvin Amount Chm Mole CurrentAmpere Luminous InCandela

Metric Prefixes Giga (G) Mega(M) Kilo(k) Nano(n) Milli(m) Micro(  ) Centi(c)

Metric Prefixes (G) = 10 9 (M) = 10 6 (k) = 10 3 (n) = (m) = (  ) = (c) = 10 -2

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

Convert 40.0 ft to inches 40.0 ft 12 in ft =

Convert 40.0 ft to inches 40.0 ft 12 in ft = 480 inches

Convert: 2.50 cm to Mm 4.2 ns to ms 3.15 kg to  g

Convert: 2.50 cm m Mm cm 10 6 m

Convert: 2.50 cm m Mm cm 10 6 m = 2.50 x Mm

Convert: 4.2 ns s ms ns s

Convert: 4.2 ns s ms ns s = 4.2 x ms

Convert: 3.15 kg 10 3 g  g kg g

Convert: 3.15 kg 10 3 g  g kg g = 3.15 x 10 9   g

Convert: 4.35 kg/L to mg/  L 2.31 mm/ns to cm/Ms

4.35 kg 10 3 g mg L L kg g  L

4.35 kg 10 3 g mg L L kg g  L = 4.35 mg/  L

2.31 mm m cm ns mm m ns 10 6 s s Ms

2.31 mm m cm ns mm m ns 10 6 s s Ms

= 2.31 x cm/Ms

Calculate the volume in m 3 occupied by 750 kg of gas with 1.50 g/L 1 cm 3 = 1 mL

Calculate the mass in kg of a board that has dimensions of 250 mm x 4.0 x 10 4  m x 2.5 m and had a density of 0.80 g/mL 1 ml = 1 cm 3

Calculate the density in g/mL of a 3.14 x 10 3 kg cylinder that 5.0 m long & has a diameter of 2.0 m.

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

Determine the length in miles of a light year Light year = distance light travels in one year c = 3.0 x 10 8 m/s 1 mile = 5280 ft 1 inch = 2.54 cm