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 sample of a metal has a mass of $$ 45.0 \ \mathrm{g} $$ and a volume of $$ 15.0 \ \mathrm{cm}^3 . $$What is its density?

Accepted Answer

$$ 3.00 \ \mathrm{g/cm}^3 $$

Question 4

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

Accepted Answer

The bond in $$ \mathrm{NaCl} $$

Question 5

A student measures the length of a table as $$ 2.30 \ \mathrm{m} $$ and the width as $$ 1.2 \ \mathrm{m} . $$What is the area, reported with the correct number of significant figures?

Accepted Answer

$$ 2.8 \ \mathrm{m}^2 $$

Question 6

Which of the following is NOT an SI base unit?

Accepted Answer

Gram

Question 7

Which statement correctly describes the location of subatomic particles in an atom?

Accepted Answer

Protons and neutrons are in the nucleus; electrons orbit the nucleus.

Question 8

A chemist needs to prepare $$ 250.0 \ \mathrm{mL}  of a $$solution with a density of $$ 1.10 \ \mathrm{g/mL} . $$What mass of solution is required?

Accepted Answer

$$ 275 \ \mathrm{g} $$

Question 9

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 10

Which of the following measurements contains the correct number of significant figures?

Accepted Answer

$$ 3.200  (4 $$significant figures)

Question 11

A patient receives a medication with a mass of $$ 0.250 \ \mathrm{g} $$ dissolved in $$ 50.0 \ \mathrm{mL}  of $$solution. What is the concentration in $$ \mathrm{g/mL} $$?

Accepted Answer

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

Question 12

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

Accepted Answer

The bond between hydrogen and oxygen in water

Question 13

A student is asked to identify a pure substance from a list. Which of the following is a pure substance?

Accepted Answer

Carbon dioxide

Question 14

Which of the following best describes the difference between a solid and a gas?

Accepted Answer

A solid has a definite shape and volume, while a gas has neither.

Question 15

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

Accepted Answer

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

Question 16

A laboratory experiment requires you to measure time, mass, and temperature. Which SI base units should you use for each measurement, respectively?

Accepted Answer

Second, kilogram, kelvin

Question 17

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

Accepted Answer

They express the precision of a measurement and help communicate uncertainty.

Question 18

A sample of gas has a mass of $$ 0.500 \ \mathrm{g} $$ and occupies a volume of $$ 250 \ \mathrm{mL} . $$What is its density in $$ \mathrm{g/mL} $$?

Accepted Answer

$$ 0.0020 \ \mathrm{g/mL} $$

Question 19

Which of the following best describes an element?

Accepted Answer

A pure substance that cannot be broken down by chemical means.

Matter and Measurements: General Chemistry Study Guide

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