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 $$ 45.67 \ \mathrm{g} $$ and its volume as $$ 16.2 \ \mathrm{cm}^3 . $$What is the density of the metal, reported with the correct number of significant figures?

Accepted Answer

$$ 2.82 \ \mathrm{g/cm}^3 $$

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 has a mass of $$ 0.250 \ \mathrm{g} $$ and occupies a volume of $$ 125 \ \mathrm{mL} . $$What is its density in $$ \mathrm{g/mL} $$?

Accepted Answer

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

Question 7

Which of the following statements about atoms is correct?

Accepted Answer

Protons and neutrons are found in the nucleus.

Question 8

A chemist needs to prepare $$ 250 \ \mathrm{mL}  of a $$solution. Which SI unit should be used to record the volume?

Accepted Answer

Liter

Question 9

Which of the following best describes a pure substance?

Accepted Answer

A substance with a fixed composition and distinct properties.

Question 10

A student records the following measurements: $$ 12.30 \ \mathrm{g} $$, $$ 12.3 \ \mathrm{g} $$, $$ 12.300 \ \mathrm{g} $$, and $$ 12.3000 \ \mathrm{g} . $$Which measurement has the greatest number of significant figures?

Accepted Answer

$$ 12.3000 \ \mathrm{g} $$

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 patient receives a medication dissolved in $$ 100 \ \mathrm{mL}  of $$solution. If the solution has a density of $$ 1.05 \ \mathrm{g/mL} $$, what is the mass of the solution?

Accepted Answer

$$ 105 \ \mathrm{g} $$

Question 13

Which of the following is NOT a property of matter?

Accepted Answer

Can be seen with the naked eye

Question 14

A sample of ethanol has a mass of $$ 78.5 \ \mathrm{g} $$ and a volume of $$ 100.0 \ \mathrm{mL} . $$What is the density of ethanol?

Accepted Answer

$$ 0.785 \ \mathrm{g/mL} $$

Question 15

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

Accepted Answer

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

Question 16

A student is asked to convert $$ 0.250 \ \mathrm{kg}  to $$grams. What is the correct answer?

Accepted Answer

$$ 250.0 \ \mathrm{g} $$

Question 17

Which of the following is the correct formula for density?

Accepted Answer

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

Question 18

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 19

A laboratory thermometer measures temperature in which SI unit?

Accepted Answer

Kelvin

Question 20

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

Accepted Answer

All nonzero digits are significant.

Matter and Measurements: General Chemistry Study Guide

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