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

$$2.82\ \mathrm{g/mL}$$

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 SI unit would you use to measure the amount of a substance in a chemical reaction?

Accepted Answer

Mole

Question 6

A sample of gas has a mass of $$0.500\ \mathrm{g}$$ and occupies a volume of $$250.0\ \mathrm{mL}. $$What is its density in $$\mathrm{g/mL}$$?

Accepted Answer

$$0.0050\ \mathrm{g/mL}$$

Question 7

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 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 $$0.03040\ \mathrm{kg}. $$How many significant figures does this value have?

Accepted Answer

4

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

Question 11

A patient receives a medication that is dosed based on body mass. If the patient weighs $$70.0\ \mathrm{kg}$$ and the medication is administered at $$0.15\ \mathrm{mg/kg}$$, how many milligrams of medication should the patient receive? (Report with correct significant figures.)

Accepted Answer

$$10.5\ \mathrm{mg}$$

Question 12

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 13

Which of the following is NOT an SI base unit?

Accepted Answer

Gram

Question 14

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 15

Which of the following best explains why significant figures are important in scientific measurements?

Accepted Answer

They express the precision of a measurement.

Question 16

A laboratory experiment requires you to prepare $$250.0\ \mathrm{mL} of a $$solution. If the solution must have a mass of $$200.0\ \mathrm{g}$$, what should its density be?

Accepted Answer

$$0.80\ \mathrm{g/mL}$$

Question 17

Which of the following best describes the process that occurs when table salt ($$\mathrm{NaCl}) $$dissolves in water?

Accepted Answer

Ionic bonds in $$\mathrm{NaCl}$$ are broken, and ions are surrounded by water molecules.

Question 18

Which of the following is a correct statement about elements?

Accepted Answer

Elements are composed of only one type of atom.

Question 19

A sample of ethanol has a density of $$0.789\ \mathrm{g/mL}. $$What is the mass of $$50.0\ \mathrm{mL} of $$ethanol?

Accepted Answer

$$39.5\ \mathrm{g}$$

Question 20

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

Accepted Answer

Ionic bonds involve transfer of electrons, while covalent bonds involve sharing of electrons.

Matter and Measurements: General Chemistry Study Guide

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