Question 1

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

Accepted Answer

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

Question 3

A student measures the mass of a metal block as $$45.67\ \mathrm{g}$$ and its volume as $$12.3\ \mathrm{cm^3$}. $$What is the density of the metal, reported with the correct number of significant figures?

Accepted Answer

$$3.71\ \mathrm{g/cm^3$}$$

Question 4

Which of the following best explains why water ($$\mathrm{H_2O}) is $$classified as a pure substance?

Accepted Answer

It has a fixed composition and distinct chemical properties.

Question 5

Which SI unit would be most appropriate to measure the amount of a chemical substance used in a reaction?

Accepted Answer

Mole

Question 6

A chemist needs to prepare $$250.0\ \mathrm{mL} of a $$solution. If the solution's density is $$1.10\ \mathrm{g/mL}$$, what is the mass of the solution in grams?

Accepted Answer

$$275\ \mathrm{g}$$

Question 7

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements are arranged by increasing atomic number.

Question 8

Which of the following best describes the location of electrons in an atom?

Accepted Answer

Electrons orbit the nucleus in defined energy levels.

Question 9

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

Accepted Answer

$$0.002\ \mathrm{g/mL}$$

Question 10

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

Accepted Answer

It can be separated into components by physical means.

Question 11

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by sharing electron pairs between atoms.

Question 12

A student records the following measurements: $$12.0\ \mathrm{cm}$$, $$12.00\ \mathrm{cm}$$, and $$12\ \mathrm{cm}. $$Which measurement has the greatest number of significant figures?

Accepted Answer

$$12.00\ \mathrm{cm}$$

Question 13

Which of the following is a real-life example of a chemical change involving a compound?

Accepted Answer

Burning of methane ($$\mathrm{CH_4$}) in $$oxygen to produce $$\mathrm{CO_2$}$$ and $$\mathrm{H_2O}$$

Question 14

Which of the following best explains why helium is considered an element?

Accepted Answer

It cannot be broken down by chemical means.

Question 15

A laboratory thermometer reads $$25.0\ ^\circ\mathrm{C}. $$What is this temperature in kelvin?

Accepted Answer

$$298.15\ \mathrm{K}$$

Question 16

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 17

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

Accepted Answer

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

Question 18

Which of the following best describes the composition of the nucleus of an atom?

Accepted Answer

It contains protons and neutrons.

Question 19

A patient receives a dose of $$0.250\ \mathrm{mol} of a $$medication. If the molar mass of the medication is $$180.0\ \mathrm{g/mol}$$, what mass of medication did the patient receive?

Accepted Answer

$$72.0\ \mathrm{g}$$

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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