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 block, 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 $$ 0.250 \ \mathrm{kg} $$ and occupies a volume of $$ 0.500 \ \mathrm{m}^3 . $$What is its density in $$ \mathrm{kg/m}^3 $$?

Accepted Answer

$$ 0.500 \ \mathrm{kg/m}^3 $$

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

A chemist records a measurement as $$ 0.00450 \ \mathrm{mol} . $$How many significant figures are in this measurement?

Accepted Answer

3

Question 9

Which of the following statements about atoms is correct?

Accepted Answer

Protons and neutrons are found in the nucleus.

Question 10

A patient receives a dose of medication that is measured in moles. Which SI base unit is used to express this amount?

Accepted Answer

Mole

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 ($$ \mathrm{H}_2\mathrm{O} )$$

Question 12

A student is asked to convert a measurement of $$ 25.0 \ \mathrm{cm}  to $$meters using SI units. What is the correct value?

Accepted Answer

$$ 0.250 \ \mathrm{m} $$

Question 13

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 14

A laboratory experiment requires you to measure the temperature of a reaction. Which SI unit should you use?

Accepted Answer

Kelvin

Question 15

Which of the following is NOT a property of matter?

Accepted Answer

Has a fixed composition

Question 16

A sample of ethanol has a mass of $$ 78.5 \ \mathrm{g} $$ and a volume of $$ 99.0 \ \mathrm{mL} . $$What is the density of ethanol in $$ \mathrm{g/mL} $$? (Report your answer to three significant figures.)

Accepted Answer

$$ 0.793 \ \mathrm{g/mL} $$

Question 17

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

Accepted Answer

A metal transfers electrons to a nonmetal.

Question 18

A scientist needs to measure the time it takes for a chemical reaction to complete. Which SI unit should be used?

Accepted Answer

Second

Question 19

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

Accepted Answer

$$ 45.600 $$

Question 20

A sample of a substance is found to have a mass of $$ 12.0 \ \mathrm{g} $$ and a volume of $$ 8.0 \ \mathrm{cm}^3 . If $$another sample of the same substance has a mass of $$ 30.0 \ \mathrm{g} $$, what is its volume?

Accepted Answer

$$ 20.0 \ \mathrm{cm}^3 $$

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

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