Question 1

Which of the following best describes a compound?

Accepted Answer

A combination of two or more elements in a fixed ratio.

Question 2

Which of the following statements about gases is correct?

Accepted Answer

Gases have no fixed volume or shape and molecules move at high speeds.

Question 3

What is the SI base unit for temperature?

Accepted Answer

Kelvin

Question 4

Convert 65 $$^\circC to $$Kelvin. Use the formula $$K = ^\circ C + 273.15.$$

Accepted Answer

$$K = 338.15$$

Question 5

A solution has a density of $$4.23 \ \mathrm{g/mL}. $$What is the mass of $$25 \ \mathrm{mL} of $$this solution? Use $$	ext{mass} = 	ext{density} 	imes 	ext{volume}.$$

Accepted Answer

$$106 \ \mathrm{g}$$

Question 6

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Salad

Question 7

How many significant figures are in the measurement $$0.00340$$?

Accepted Answer

3

Question 8

Which of the following best describes accuracy?

Accepted Answer

The closeness of a measurement to the true value.

Question 9

Round $$0.02468 to $$three significant figures.

Accepted Answer

$$0.0247$$

Question 10

Express $$0.000481 in $$scientific notation with the correct number of significant figures.

Accepted Answer

$$4.81 	imes 10$$^{-4}$$

Question 11

Which prefix represents $$10^{-9}$$?

Accepted Answer

nano-

Question 12

A student measures the mass of a sample as $$78.90 \ \mathrm{g}$$ and the volume as $$100.0 \ \mathrm{mL}. $$What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$0.789 \ \mathrm{g/mL}$$

Question 13

Convert $$7.89$$ meters to inches. (Given: $$1 \ \mathrm{inch} = 2.54 \ \mathrm{cm})$$

Accepted Answer

$$311 \ \mathrm{inches}$$

Question 14

Which of the following is a correct statement about significant figures in addition and subtraction?

Accepted Answer

The answer is rounded to the same number of decimal places as the measurement with the fewest decimal places.

Question 15

A sample of gold has a mass of $$16.4$$ nanograms and a volume of $$1.36$$ picoliters. What is its density in $$\mathrm{g/cm^3$}$$? ($$1 \ \mathrm{ng} = 1 	imes 10$$^{-9}$$ \ \mathrm{g}$$, $$1 \ \mathrm{pL} = 1 	imes 10$$^{-12}$$ \ \mathrm{L}$$, $$1 \ \mathrm{cm^3$} = 1 	imes 10$$^{-3}$$ \ \mathrm{L})$$

Accepted Answer

$$1.21 \ \mathrm{g/cm^3$}$$

Question 16

Which of the following is the correct symbol for the element sodium?

Accepted Answer

Na

Question 17

What is the temperature in Fahrenheit of a human body at $$37.2^\circC$$? Use $$^\circ F = \frac{9}{5}(^\circ C) + 32.$$

Accepted Answer

$$99.0^\circF$$

Question 18

Which of the following is a pure substance?

Accepted Answer

Salt (NaCl)

Question 19

Which of the following best describes precision?

Accepted Answer

The closeness of repeated measurements to each other.

Introduction to Matter, Measurement, and Scientific Calculations

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