Question 1

Which of the following best describes a chemical change?

Accepted Answer

Iron rusting when exposed to air

Question 2

A sample of gold has a mass of $$19.3\ \mathrm{g}$$ and a volume of $$1.00\ \mathrm{cm}^3. $$What is the density of gold in $$\mathrm{g/cm}^3$$?

Accepted Answer

$$19.3\ \mathrm{g/cm}^3$$

Question 3

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 4

A student measures the mass of a coin as $$2.50\ \mathrm{g}$$ and its volume as $$0.31\ \mathrm{cm}^3. $$What is the density of the coin, reported with the correct number of significant figures?

Accepted Answer

$$8.1\ \mathrm{g/cm}^3$$

Question 5

Which of the following statements about subatomic particles is correct?

Accepted Answer

Neutrons are neutral and found in the nucleus.

Question 6

A neutral atom of chlorine has an atomic number of $$17$$ and a mass number of $$35. $$How many neutrons does it have?

Accepted Answer

$$18$$

Question 7

Which of the following best describes a homogeneous mixture?

Accepted Answer

A glass of salt water

Question 8

Which of the following is the correct electron configuration for a neutral atom of magnesium ($$Z=12$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$

Question 9

Which of the following graphs would best represent an inverse relationship between two variables?

Accepted Answer

A curve that decreases as $$x$$ increases

Question 10

A sample contains $$80\%$$ isotope $$A ($$mass $$10.0\ \mathrm{amu}) $$and $$20\%$$ isotope $$B ($$mass $$11.0\ \mathrm{amu}). $$What is the average atomic mass?

Accepted Answer

$$10.2\ \mathrm{amu}$$

Question 11

Which of the following is the correct SI base unit for mass?

Accepted Answer

Kilogram ($$kg)$$

Question 12

If a substance has a melting point of $$0\ ^\circ\mathrm{C}$$ and a boiling point of $$100\ ^\circ\mathrm{C}$$, what is its physical state at $$50\ ^\circ\mathrm{C}$$ under standard pressure?

Accepted Answer

Liquid

Question 13

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 14

Which of the following best describes the trend in atomic radius across a period from left to right in the periodic table?

Accepted Answer

Atomic radius decreases

Question 15

A student needs to convert $$5.00\ \mathrm{km} to $$meters using dimensional analysis. What is the correct answer?

Accepted Answer

$$5000\ \mathrm{m}$$

Question 16

Which of the following ions has a $$2+$$ charge?

Accepted Answer

$$\mathrm{Ca}^{2+}$$

Question 17

Which of the following is the correct scientific notation for $$0.00056$$?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 18

Which of the following best describes the valence electrons for an atom of oxygen ($$Z=8$$)?

Accepted Answer

6 valence electrons

Question 19

Which of the following is a correct statement about isotopes?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 20

Which of the following best describes a direct relationship between two variables?

Accepted Answer

As one variable increases, the other increases.

General Chemistry Study Guide: Matter, Measurement, Atomic Structure, and Dimensional Analysis

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