Question 1

Which of the following is a quantitative observation?

Accepted Answer

The temperature of the liquid is $$78.5\ ^\circ\mathrm{C}.$$

Question 2

Express $$0.00045 in $$scientific notation.

Accepted Answer

$$4.5 	imes 10$$^{-4}$$

Question 3

How many significant figures are in the measurement $$0.02030$$?

Accepted Answer

4

Question 4

A student measures the mass of a sample as $$12.30 g $$and its volume as $$4.0 mL. $$What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$3.1 g/mL$$

Question 5

Which of the following conversion factors is considered exact and does NOT affect significant figures in calculations?

Accepted Answer

$$1\ \mathrm{ft} = 12\ \mathrm{in}$$

Question 6

A block of metal has a mass of $$54.0 g $$and a volume of $$20.0 cm$^3. $$What is its density, and how many significant figures should the answer have?

Accepted Answer

$$2.70 g/cm$^3$$, 3 significant figures

Question 7

Which of the following numbers is ambiguous in terms of significant figures and should be avoided in reporting measurements?

Accepted Answer

$$100$$

Question 8

A nurse needs to convert $$2.50 L of IV $$fluid to mL for a patient. What is the correct answer, using the appropriate number of significant figures?

Accepted Answer

$$2.50 	imes 10$$^{3}$$ mL

Question 9

Which statement about significant figures is TRUE?

Accepted Answer

Zeros between nonzero digits are significant.

Question 10

A measurement is recorded as $$0.004560 g. $$How many significant figures does it have?

Accepted Answer

5

Question 11

Which of the following is the correct result for $$3.45 yd $$converted to inches, using the correct number of significant figures? (1 yd = 36 in, exact)

Accepted Answer

$$124.2 in$$

Question 12

When adding $$12.11 g$$, $$0.034 g$$, and $$1.2 g$$, what is the correct sum with the proper number of decimal places?

Accepted Answer

$$13.3 g$$

Question 13

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object, weight is the force of gravity on that object.

Question 14

A cube of aluminum has sides of $$7.18 cm. If $$the density of aluminum is $$2.70 g/cm$^3$$, what is the mass of the cube, to the correct number of significant figures?

Accepted Answer

$$993 g$$

Question 15

Which metric prefix represents $$10^{-6}$$?

Accepted Answer

micro

Question 16

A student records a measurement as $$1.20 	imes 10$$^{3}$$ m. How many significant figures does this value have?

Accepted Answer

3

Question 17

Which of the following is a correct statement about the rules for rounding in significant figures?

Accepted Answer

If the digit to be dropped is 5 or greater, round up.

Question 18

A patient’s blood sample has a mass of $$0.950 g $$and a volume of $$0.90 mL. $$What is the density of the blood sample, reported with the correct number of significant figures?

Accepted Answer

$$1.1 g/mL$$

Question 19

Which of the following is NOT a base SI unit?

Accepted Answer

liter

Chapter 1: Measurements – Study Notes for GOB Chemistry

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