Question 1

Which of the following statements about derived units is correct?

Accepted Answer

Derived units are combinations of fundamental units, such as $$\mathrm{m^2$}$$ for area and $$\mathrm{m^3$}$$ for volume.

Question 2

A laboratory technician needs to measure out exactly $$1\ \mathrm{mL} of $$water. Which of the following is equivalent to $$1\ \mathrm{mL}$$?

Accepted Answer

$$1\ \mathrm{cm^3$}$$

Question 3

A sample of chloroform has a density of $$1.5\ \mathrm{g/mL} at$$ $$20^\circ\mathrm{C}. $$What volume (in mL) is needed to obtain $$3.0\ \mathrm{g} of $$chloroform?

Accepted Answer

$$2.0\ \mathrm{mL}$$

Question 4

Which of the following best describes the concept of accuracy in scientific measurement?

Accepted Answer

How close a measurement is to the true or accepted value.

Question 5

A student measures the mass of a plastic sample as $$2.50\ \mathrm{g}$$ and its volume as $$2.00\ \mathrm{cm^3$}. $$What is the density of the plastic?

Accepted Answer

$$1.25\ \mathrm{g/cm^3$}$$

Question 6

Which of the following is true about the density of water as temperature increases from $$4^\circ\mathrm{C} to$$ $$30^\circ\mathrm{C}$$?

Accepted Answer

The density of water decreases.

Question 7

Which of the following measurements contains three significant figures?

Accepted Answer

$$0.00661\ \mathrm{g}$$

Question 8

A student records the length of a strip as $$17.4\ \mathrm{cm}. $$Which rule for significant figures did the student apply?

Accepted Answer

All digits except the last are certain; the last digit is estimated.

Question 9

Which of the following best describes precision in scientific measurement?

Accepted Answer

How close repeated measurements are to each other.

Question 10

A gold bar has a mass of $$193.1\ \mathrm{g}$$ and a volume of $$10.0\ \mathrm{cm^3$}. $$What is its density?

Accepted Answer

$$19.31\ \mathrm{g/cm^3$}$$

Question 11

Which of the following is an example of a derived unit?

Accepted Answer

$$\mathrm{m^2$}$$

Question 12

A student measures the mass of a sample as $$0.00661\ \mathrm{g}. $$How many significant figures does this measurement have?

Accepted Answer

Three

Question 13

Which of the following statements about counting objects (such as 50 students) is correct regarding significant figures?

Accepted Answer

Counting numbers have infinite significant figures.

Question 14

A scientist needs to identify a plastic sample. Which property would be most useful for identification?

Accepted Answer

Density

Question 15

Which of the following is the correct formula for density?

Accepted Answer

$$\mathrm{Density = \frac{Mass}{Volume}}$$

Question 16

A student measures the mass of a sample as $$3.4200 	imes 10^4$\ \mathrm{g}. $$How many significant figures does this value have?

Accepted Answer

Five

Question 17

Which of the following best explains why density is temperature dependent?

Accepted Answer

As temperature increases, the volume of most substances increases, causing density to decrease.

Question 18

A student is asked to record the length of a strip using a ruler marked in centimeters. The strip ends between 17 and 18 cm. What is the correct way to record the measurement?

Accepted Answer

17.4 cm

Question 19

Which of the following is NOT a correct statement about significant figures?

Accepted Answer

All zeros are always significant.

Question 20

A sample of air has a density of $$0.001185\ \mathrm{g/cm^3$} at$$ $$25^\circ\mathrm{C}. $$What is the mass of $$2.00\ \mathrm{L} of $$air at this temperature? (1 L = 1000 cm$$^3)$$

Accepted Answer

$$2.37\ \mathrm{g}$$

Derived Units, Density, Accuracy & Precision, and Significant Figures

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