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 $$45.67\ \mathrm{g}$$ and its volume as $$12.3\ \mathrm{cm}^3. $$What is the density of the metal block, reported with the correct number of significant figures?

Accepted Answer

$$3.71\ \mathrm{g/cm}^3$$

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 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

$$2.00\ \mathrm{g/L}$$

Question 7

Which of the following best explains why water ($$\mathrm{H}_2\mathrm{O}) is $$considered a pure substance?

Accepted Answer

It has a fixed composition and distinct chemical properties.

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 combines two elements, A and B, in a fixed ratio to form a new substance with properties different from both A and B. What type of substance has been formed?

Accepted Answer

A compound

Question 10

Which of the following statements about atoms is correct?

Accepted Answer

Protons and neutrons are found in the nucleus.

Question 11

A student records the following measurements: $$12.0\ \mathrm{g}$$, $$12.00\ \mathrm{g}$$, and $$12\ \mathrm{g}. $$Which measurement has the greatest number of significant figures?

Accepted Answer

$$12.00\ \mathrm{g}$$

Question 12

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between atoms.

Question 13

A patient receives a dose of medication that is $$0.250\ \mathrm{g} in $$mass. If the medication is dissolved in $$50.0\ \mathrm{mL} of $$solution, what is the concentration in $$\mathrm{g/mL}$$, reported with the correct number of significant figures?

Accepted Answer

$$0.005\ \mathrm{g/mL}$$

Question 14

Which of the following is a property of a pure substance but NOT of a mixture?

Accepted Answer

Fixed composition

Question 15

A student is asked to identify the state of matter for a sample that has a definite volume but no definite shape. Which state is it?

Accepted Answer

Liquid

Question 16

Which of the following best explains why carbon dioxide ($$\mathrm{CO}_2) is $$classified as a compound?

Accepted Answer

It consists of two or more elements chemically combined in a fixed ratio.

Question 17

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

Accepted Answer

Kelvin

Question 18

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

Accepted Answer

The bond between hydrogen and oxygen in water ($$\mathrm{H}_2\mathrm{O})$$

Question 19

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

Accepted Answer

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

Question 20

A student mixes sand and salt together. Which of the following best describes the result?

Accepted Answer

A mixture

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

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