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 16.2 mL. What is the density of the block, reported with the correct number of significant figures?

Accepted Answer

$$2.8 \ \mathrm{g/mL}$$

Question 4

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

Accepted Answer

The bond between sodium and chlorine in $$\mathrm{NaCl}$$

Question 5

Which of the following is NOT an SI base unit?

Accepted Answer

Gram

Question 6

A sample of gas has a mass of 0.250 kg and occupies a volume of 0.500 L. What is its density in $$\mathrm{g/mL}$$?

Accepted Answer

$$0.5 \ \mathrm{g/mL}$$

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 has a variable composition.

Question 8

Which of the following statements about atoms is correct?

Accepted Answer

Protons and neutrons are found in the nucleus.

Question 9

A chemist records a measurement as 0.00450 m. How many significant figures does this value have?

Accepted Answer

3

Question 10

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

Accepted Answer

The bond between hydrogen and oxygen in water ($$\mathrm{H_2O})$$

Question 11

A student is asked to convert 25.0 °C to kelvin. Which equation should they use, and what is the correct answer?

Accepted Answer

Use $$K = ^\circ C + 273.15$$; the answer is $$298.15 \ K$$

Question 12

Which of the following best explains why water ($$\mathrm{H_2O}) is $$considered a compound and not an element?

Accepted Answer

It can be separated into hydrogen and oxygen by chemical means.

Question 13

A nurse needs to prepare a saline solution by dissolving 9.0 g of NaCl in enough water to make 0.500 L of solution. What is the density of the solution if its total mass is 509.0 g?

Accepted Answer

$$1.02 \ \mathrm{g/mL}$$

Question 14

Which of the following is the correct definition of a mole in SI units?

Accepted Answer

The amount of substance containing as many entities as there are atoms in 12 grams of carbon-12.

Question 15

A student mixes two clear liquids and observes the formation of a solid. What type of change has most likely occurred?

Accepted Answer

A chemical change, because a new substance (solid) has formed.

Question 16

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve transferring electrons, while covalent bonds involve sharing electrons.

Question 17

A gold bar has a mass of 2.50 kg and a volume of 0.130 L. What is its density in $$\mathrm{g/cm^3$}$$?

Accepted Answer

$$19.2 \ \mathrm{g/cm^3$}$$

Question 18

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

Accepted Answer

Zeros between nonzero digits are significant.

Question 19

Which of the following is a real-world example of a physical change?

Accepted Answer

Dissolving sugar in water.

Question 20

A laboratory technician needs to measure the temperature of a reaction in SI units. Which unit should they use?

Accepted Answer

Kelvin

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

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