$\text{Average atomic mass} = (\text{fraction}_1 \times \text{mass}_1) + (\text{fraction}_2 \times \text{mass}_2)$

$\frac{1\ \mathrm{mol}}{\text{molar mass in g}}$

Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout, such as salt water.

Question 2

Which statement about the law of conservation of mass is correct?

Accepted Answer

Mass is neither created nor destroyed in a chemical reaction.

Question 3

A student mixes 50 g of water with 10 g of salt to make a solution. What is the total mass of the solution?

Accepted Answer

$60\ \mathrm{g}$

Question 4

Which of the following is a physical change?

Accepted Answer

Melting ice into water

Question 5

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 6

What is the atomic number of an atom with 17 protons, 18 neutrons, and 17 electrons?

Accepted Answer

$17$

Question 7

Which of the following is a correct statement about isotopes?

Accepted Answer

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

Question 8

Which scientist proposed the plum pudding model of the atom?

Accepted Answer

J.J. Thomson

Question 9

What is the correct formula to calculate the average atomic mass of an element with two isotopes?

Accepted Answer

$	ext{Average atomic mass} = (	ext{fraction}_1 	imes 	ext{mass}_1) + (	ext{fraction}_2 	imes 	ext{mass}_2)$

Question 10

Which of the following elements is an alkali metal?

Accepted Answer

Sodium ($\mathrm{Na}$)

Question 11

Which statement about noble gases is correct?

Accepted Answer

They have a full valence electron shell and are generally unreactive.

Question 12

How many moles are in $18\ \mathrm{g}$ of water ($\mathrm{H_2O}$)? (Molar mass of $\mathrm{H_2O}$ is $18\ \mathrm{g/mol}$)

Accepted Answer

$1\ \mathrm{mol}$

Question 13

Which separation technique would be best for separating a mixture of sand and salt water?

Accepted Answer

Filtration followed by evaporation

Question 14

Which of the following is the correct empirical formula for glucose ($\mathrm{C_6H_{12}O_6}$)?

Accepted Answer

$\mathrm{CH_2O}$

Question 15

Which of the following is a covalent compound?

Accepted Answer

Carbon dioxide ($\mathrm{CO_2}$)

Question 16

What is the charge on a chloride ion?

Accepted Answer

$-1$

Question 17

Which scientist is associated with the uncertainty principle?

Accepted Answer

Werner Heisenberg

Question 18

Which of the following is a correct conversion factor for converting grams to moles?

Accepted Answer

$\frac{1\ \mathrm{mol}}{	ext{molar mass in g}}$

Question 19

Which of the following best describes a chemical property?

Accepted Answer

The ability of a substance to react with oxygen

Question 20

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

$1s^2\ 2s^2\ 2p^4$

General Chemistry Study Guide: Foundations, Atoms, and Compounds

Study Guide - Practice Questions