Question: What are the basic unites of:

Length?

Mass?

Volume?

Temperature?

in the SI system

Answer: Length = meter

Mass = kilogram

Volume = m^3

Temperature = kelvin

Question: What decimal power do the following abbreviations represent?

M

k

m

n

u

Answer: M = 6

k = 3

m = -3

n = -9

u = -6

Question: What is the length in millimeters of a crystal of copper sulfate that is 0.180 in. long?

Answer: 0.180 in x 1 cm/2.54 in. x 10 mm/1 cm = 4.57 mm

Question: Perform the following conversions:

a) 72.3 mg to g

b) 6.0x10^-10 m to mm

c) 325 mm to um

Answer: a) 72.3 mg x 1 g/1000 mg = 0.0723 g

b) 6.0 x 10^-10 m x 1000 mm/1 m = 6.0 x 10^-7 mm

c) 325 mm x 1000 um/1 mm = 3.25 x 10^5 um

Question: A liquid has a volume of 3.70 L. What is its volume in mL? In cm^3?

Answer: 3.70 L x 1000 mL/1 L = 3,700 mL = 3.70 x 10^3 mL

3.70 L x 1000 cm^3/1 L = 3,700 cm^3 = 3.70 x 10^3 cm^3

Question: Why should you never determine the mass of a hot object?Why should you never place a hot object on the pan of a balance?

Answer:

Question: Why is it necessary to calibrate a thermometer and volumetric glassware? Why do you calibrate thermometers and pipets?

Answer: Thermometers and volumetric glassware are designed to be accurate. But their manufacture is subject to human error, and they should be calibrated. Thermometers, pipets, and other pieces of laboratory equipment are mass-produced and subject to human error. Consequently, they should be calibrated.

Question: What is precision?

Answer: Precision is a measure of the internal consistency of a replicate set of data.

Question: Determining the mass of an object three times gave the following results: 9.2 g, 9.1 g, and 9.3 g. Find the mean mass and the average deviation from the mean.

Answer: 9.2 + 9.1 + 9.3 = 27.6/3 = 9.2 (MEAN)

|9.2 - 9.2| + |9.1 - 9.2| + |9.3 - 9.2| = 0.2/3 = 0.07 (A.D)

Question: What is the mass in kilograms of 680 mL of a substance that has a density of 0.930 g/mL?

Answer: D=M/V

M=DV

M=(680)(0.930) = 632.4 g

632.4 g x 1 g/1000 kg = 0.632 kg