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 organized by increasing atomic number.

Question 3

A student measures the mass of a metal block as $$45.2\ \mathrm{g}$$ and its volume as $$12.1\ \mathrm{cm}^3. $$What is the density of the metal block, reported with the correct number of significant figures?

Accepted Answer

$$3.74\ \mathrm{g/cm}^3$$

Question 4

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

Accepted Answer

The bond in $$\mathrm{NaCl}$$

Question 5

Which SI unit would you use to measure the amount of a chemical substance in a laboratory experiment?

Accepted Answer

Mole

Question 6

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

Accepted Answer

$$0.50\ \mathrm{g/L}$$

Question 7

Which of the following best describes the difference between an element and a compound?

Accepted Answer

A compound is made of two or more elements chemically combined, while an element consists of only one type of atom.

Question 8

Which of the following is NOT a correct pairing of an SI unit with the quantity it measures?

Accepted Answer

Kilogram – time

Question 9

A chemist records a measurement as $$0.04050\ \mathrm{g}. $$How many significant figures does this measurement have?

Accepted Answer

4

Question 10

Which statement about the structure of an atom is correct?

Accepted Answer

Protons and neutrons are found in the nucleus; electrons orbit the nucleus.

Question 11

Which of the following is a real-life example of a covalent bond?

Accepted Answer

The bond between hydrogen and oxygen in water

Question 12

A student mixes two clear liquids and observes the formation of a white solid. Which of the following best describes the white solid?

Accepted Answer

A compound formed by a chemical reaction

Question 13

Which of the following measurements is the most precise?

Accepted Answer

$$2.000\ \mathrm{g}$$

Question 14

A patient receives a dose of medication that is $$0.250\ \mathrm{mol}. $$Which SI unit is used to express this amount?

Accepted Answer

Mole

Question 15

Which of the following best explains why ionic compounds tend to have high melting points?

Accepted Answer

They are composed of ions held together by strong electrostatic forces.

Question 16

A sample of ethanol has a mass of $$78.5\ \mathrm{g}$$ and a volume of $$99.0\ \mathrm{mL}. $$What is the density of ethanol in $$\mathrm{g/mL}$$?

Accepted Answer

$$0.793\ \mathrm{g/mL}$$

Question 17

Which of the following is NOT a property of matter?

Accepted Answer

Can be seen with the naked eye

Question 18

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

Accepted Answer

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

Question 19

Which of the following is a correct application of significant figures when multiplying $$2.34 by$$ $$1.2$$?

Accepted Answer

$$2.8 ($$two significant figures)

Question 20

Which of the following best explains why water ($$\mathrm{H_2O}) is $$considered a pure substance?

Accepted Answer

It has a fixed composition and distinct properties.

Matter, Measurements, and Basic Atomic Structure: General Chemistry Study Guide

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