$(0.7577 \times 34.969) + (0.2423 \times 36.966) = 35.45\ \text{u}$

$\text{moles} = \frac{\text{grams}}{\text{molar mass}}$

Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout

Question 2

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

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction

Question 3

A student wants to separate a mixture of sand and salt dissolved in water. Which separation technique should they use?

Accepted Answer

Distillation followed by filtration

Question 4

Which of the following is a physical change?

Accepted Answer

Melting of ice

Question 5

What is the atomic number of an element?

Accepted Answer

The number of protons in the nucleus

Question 6

Which scientist proposed the plum pudding model of the atom?

Accepted Answer

J.J. Thomson

Question 7

Calculate the average atomic mass of chlorine if 75.77% of chlorine atoms have a mass of 34.969 u and 24.23% have a mass of 36.966 u.

Accepted Answer

$(0.7577 	imes 34.969) + (0.2423 	imes 36.966) = 35.45\ 	ext{u}$

Question 8

Which of the following elements is a noble gas?

Accepted Answer

Neon

Question 9

What is the correct formula for calculating Celsius temperature from Fahrenheit?

Accepted Answer

$C = \frac{5}{9}(F - 32)$

Question 10

Which of the following is a chemical property?

Accepted Answer

Ability to react with oxygen

Question 11

Which statement about isotopes is correct?

Accepted Answer

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

Question 12

Which of the following best describes an ionic compound?

Accepted Answer

A compound formed from the transfer of electrons between a metal and a nonmetal

Question 13

What is the charge of an ion formed by an atom in Group 1A of the periodic table?

Accepted Answer

$+1$

Question 14

Which separation technique is most suitable for separating a liquid mixture based on differences in boiling points?

Accepted Answer

Distillation

Question 15

Which scientist discovered the neutron?

Accepted Answer

James Chadwick

Question 16

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

Accepted Answer

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

Question 17

Which of the following is NOT a step in the scientific method?

Accepted Answer

Ignoring experimental results

Question 18

Which law states that a chemical compound always contains the same proportion of elements by mass?

Accepted Answer

Law of constant composition

Question 19

Which of the following is a transition metal?

Accepted Answer

Iron

Question 20

Which of the following is the correct formula for converting grams to moles?

Accepted Answer

$	ext{moles} = \frac{	ext{grams}}{	ext{molar mass}}$

General Chemistry: Foundations, Atoms, and Compounds Study Guide

Study Guide - Practice Questions