Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in a fixed ratio.

Question 2

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements are arranged by increasing atomic number.

Question 3

A student measures the mass of a metal block as 45.67 g and its volume as 12.3 mL. What is the density of the block, reported with the correct number of significant figures?

Accepted Answer

$$d = \frac{45.67\ \mathrm{g}}{12.3\ \mathrm{mL}} = 3.71\ \mathrm{g/mL}$$

Question 4

Which of the following is an example of an ionic bond?

Accepted Answer

The bond in $$\mathrm{NaCl}$$, formed by electron transfer from sodium to chlorine.

Question 5

Which SI unit would be most appropriate to measure the amount of a chemical substance used in a reaction?

Accepted Answer

Mole

Question 6

A sample of gas occupies a volume of 2.50 L and has a mass of 5.00 g. What is its density?

Accepted Answer

$$d = \frac{5.00\ \mathrm{g}}{2.50\ \mathrm{L}} = 2.00\ \mathrm{g/L}$$

Question 7

Which of the following best explains why water ($$\mathrm{H_2O}) is $$classified as a compound?

Accepted Answer

It contains two different elements chemically bonded in a fixed ratio.

Question 8

Which of the following is NOT a property of all matter?

Accepted Answer

Can be seen with the naked eye

Question 9

A chemist records a measurement as 0.004560 kg. How many significant figures does this measurement have?

Accepted Answer

5

Question 10

Which of the following best describes the location of electrons in an atom?

Accepted Answer

Electrons orbit the nucleus in defined regions.

Question 11

A student mixes two clear solutions and observes the formation of a white solid. Which statement best explains this observation?

Accepted Answer

A chemical reaction has occurred, producing a new compound.

Question 12

Which of the following is the correct SI unit for temperature?

Accepted Answer

Kelvin

Question 13

Which of the following statements about covalent bonds is correct?

Accepted Answer

Covalent bonds form when atoms share pairs of electrons.

Question 14

A sample of ethanol has a mass of 78.5 g and a volume of 100.0 mL. What is its density?

Accepted Answer

$$d = \frac{78.5\ \mathrm{g}}{100.0\ \mathrm{mL}} = 0.785\ \mathrm{g/mL}$$

Question 15

Which of the following is a pure substance?

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 16

Which of the following best describes an element?

Accepted Answer

A pure substance made of only one kind of atom.

Question 17

A hospital stores oxygen gas in a tank with a mass of 3200 g and a volume of 2240 L. What is the density of the oxygen gas?

Accepted Answer

$$d = \frac{3200\ \mathrm{g}}{2240\ \mathrm{L}} = 1.43\ \mathrm{g/L}$$

Question 18

Which of the following is NOT an SI base unit?

Accepted Answer

Gram

Question 19

Which of the following best explains why sodium chloride ($$\mathrm{NaCl}) is a $$pure substance?

Accepted Answer

It has a fixed composition and can only be separated into its elements by chemical means.

Question 20

Which of the following best describes the difference between a solid and a gas?

Accepted Answer

A solid has a definite shape and volume, while a gas has neither.

Matter and Measurements: Foundations of General Chemistry

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