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 g and its volume as 12.1 mL. What is the density of the block, and which formula should be used?

Accepted Answer

Use $$d = \frac{m}{V}$$; density is $$3.74\ \mathrm{g/mL}.$$

Question 4

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

Accepted Answer

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

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 is compressed from 2.0 L to 1.0 L. If the mass remains constant, what happens to the density?

Accepted Answer

Density is doubled.

Question 7

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

Accepted Answer

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

Question 8

Which of the following is NOT a correct SI base unit and its quantity?

Accepted Answer

Gram – mass

Question 9

A chemist records a measurement as 0.04050 g. How many significant figures does this value 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. What type of change has most likely occurred?

Accepted Answer

Chemical change, because a new substance (precipitate) is formed.

Question 13

Which of the following best explains why density is considered an intensive property?

Accepted Answer

Density is the same regardless of sample size.

Question 14

A sample of ethanol has a mass of 78.5 g and a volume of 99.0 mL. What is its density, and how many significant figures should the answer have?

Accepted Answer

Density is $$0.793\ \mathrm{g/mL}$$; answer should have 3 significant figures.

Question 15

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

Accepted Answer

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

Question 16

Which of the following best describes the process of forming an ionic bond?

Accepted Answer

A metal transfers electrons to a nonmetal.

Question 17

A thermometer reads 25.0 $$^\circC. $$What is this temperature in kelvin?

Accepted Answer

$$298.15\ \mathrm{K}$$

Question 18

Which of the following is NOT a characteristic of a pure substance?

Accepted Answer

It can be separated into components by physical means.

Question 19

A student incorrectly records the mass of a sample as 12.00 g, 12.0 g, and 12 g. Which measurement shows the greatest precision?

Accepted Answer

12.00 g

Question 20

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

Accepted Answer

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

Matter, Measurement, and Atomic Structure: General Chemistry Study Notes

Study Guide - Practice Questions