Question 1

Which of the following statements best describes a compound?

Accepted Answer

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

Question 2

A student measures the mass of a metal sample as 45.6 g and its volume as 12.0 mL. What is the density of the metal, and how many significant figures should the answer have?

Accepted Answer

Density = $$\frac{45.6}{12.0} = 3.80 g/mL$$; answer should have 3 significant figures.

Question 3

Which of the following is NOT an SI base unit?

Accepted Answer

Gram

Question 4

Which type of bond is most likely to form between sodium (Na) and chlorine (Cl)?

Accepted Answer

Ionic bond

Question 5

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

Accepted Answer

Precipitate

Question 6

Which of the following statements about atoms is correct?

Accepted Answer

Protons and neutrons are found in the nucleus, while electrons orbit the nucleus.

Question 7

Which of the following best describes the difference between a pure substance and a mixture?

Accepted Answer

A pure substance has a fixed composition, while a mixture does not.

Question 8

Which of the following is an example of a covalent compound?

Accepted Answer

CO$$_2$$

Question 9

A sample of water has a mass of 250 g and occupies a volume of 250 mL. What is its density?

Accepted Answer

Density = $$\frac{250}{250} = 1.0 g/mL$$

Question 10

Which property distinguishes a gas from a solid and a liquid?

Accepted Answer

A gas has neither a fixed shape nor a fixed volume.

Question 11

Which of the following is a correct statement about significant figures?

Accepted Answer

Significant figures express the precision of a measurement.

Question 12

Which of the following is an example of an element?

Accepted Answer

O$$_2$$

Question 13

A patient receives a dose of medication measured in moles. Which SI unit is used to quantify the amount of substance?

Accepted Answer

Mole

Question 14

Which of the following best explains why ionic bonds form between metals and nonmetals?

Accepted Answer

Metals lose electrons to nonmetals, resulting in the formation of oppositely charged ions that attract each other.

Question 15

Which of the following is the correct formula for calculating density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 16

A student is given a sample of an unknown substance. It cannot be broken down by chemical means and is listed on the periodic table. What type of substance is it?

Accepted Answer

Element

Question 17

Which of the following best describes the periodic table's organization?

Accepted Answer

Elements are arranged by increasing atomic number.

Question 18

A chemist needs to measure the temperature of a reaction. Which SI unit should be used?

Accepted Answer

Kelvin

Question 19

Which of the following scenarios demonstrates the application of significant figures in a real-world context?

Accepted Answer

Rounding the final answer to match the least precise measurement used in a calculation.

Question 20

A laboratory technician needs to measure the length of a sample. Which SI unit should be used?

Accepted Answer

Meter

Matter and Measurements: Foundations of General Chemistry

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