Chapter 3Scientific Measurement

Review

Express 0.000 000 000 154 m in scientific notation.

• 1.54 x 10-10 m

What is 5928 km expressed in scientific notation?

• 5.928 x 103 km

What is the result of multiplying (2.5 x 1010 m) x

(3.5 x 10-7 m)?

• 8.8 x 103 m2

Which of the following is NOT a quantitative measurement:

5 liters, or very small?

• Very small

The closeness of a measurement to it’s true value

is a measure of …

• accuracy

In the measurement 0.503 L, what digit is not known with

certainty?

3

How many significant figures in the measurement

0.0034 kg?

• 2

How many significant figures in the measurement

40,500 mg?

• 3

How many significant figures in the measurement

811.40 grams?

• 5

Round 111.009 mm to 4 sig. figs.

• 111.0 mm

Record the following measurements with the correct

sig figs.

What is the measurement 1042 L rounded to two

significant figures?

• 1.0 x 103 L

Express the sum of 1111 km and 222 km, using the correct

sig. figs.

• 1333 km

Express the sum of 7.68 m and 5.0 m, using the correct

sig. figs.

• 12.7 m

Express the product of 2.2 mm and 5.00 mm, using

the correct number of significant figures.

• 11 mm

Express the product of (4.0 x 10-2 m) x (8.1 x 102 m)

• 32 m

Which group of measurements is the most

precise? a) 2 g, 2.5 g, 3 g

b) 1 g, 3 g, 4 g

• a

Which is expressed to 3 significant figures: 0.007 m, or

7.30 x 10-7 km

• 7.30 x 10-7 km

Which contains 2 significant figures: 0.004 40 L, or

0.000 44 L

• 0.00044 L

What quantity is represented by the metric system prefix

deci-?

• 0.1

What is the metric system prefix for the quantity

0.000 001

• micro

What is 0.0075 m expressed in cm?

• 0.75 cm

What is 7896 mm expressed in m?

• 7.896 m

A nanosecond is how many seconds: 10-6 s, or 10-9 s?

• 10-9 s

78 Liters is equal to how many cubic centimeters?

• 78 L = 78000 mL

• 78000 mL = 78000 cm3

Express 987 milligrams in grams.

• 0.987 g

The chief advantage of the metric system over other

systems of measurement is that it …

• Uses powers of 10

Which is NOT an official SI unit: kilogram, liter, or mole

• liter

Which of the following is NOT correct: a) 1 cm3 = 1 mL

b) 10 kg = 1 g c) 1000 mm = 1 m

• b

Convert -32°C to Kelvin

241 K

The actual mass of a certain compound is 1.420 g. You

calculate the mass in your lab work as 1.38 g. What is your

percent error?

• 2.82%

Which of the following volumes is the smallest: 1 milliliter, or 1 microliter

• 1 microliter

A rectangular block of lead measures 20.0 mm x 30.0 mm x 45.0mm. If the density of Pb is 11.34 g/cm3, calculate the

mass of the block.

• 306 g

As the mass of a substance increases, the density of a

given volume of that substance ...

• increases

What is the volume of 344 g of ice, if the density is 0.92

g/mL?

• 370 mL

The pressure reading from a barometer is 742 mm Hg.

Express this reading in kilopascals, kPa. (Use

dimensional analysis to solve. 760 mm Hg = 1.013 x 105 Pa)

• 98.9 kPa

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