Question 1

Which of the following is the correct chemical symbol for the element with 19 protons?

Accepted Answer

K

Question 2

Which of the following best describes the difference between a compound and an element?

Accepted Answer

A compound consists of two or more different elements chemically combined, while an element consists of only one type of atom.

Question 3

A student measures the mass of a sample as 0.00230 g. How many significant figures does this measurement have?

Accepted Answer

3

Question 4

Which of the following is a chemical change?

Accepted Answer

The process in plants that converts carbon dioxide to sugar

Question 5

Express 0.000097 as a number in scientific notation.

Accepted Answer

$9.7 	imes 10^{-5}$

Question 6

Which of the following best represents a mixture?

Accepted Answer

An egg

Question 7

A block has dimensions of $5.0\ \mathrm{cm} 	imes 2.0\ \mathrm{cm} 	imes 3.0\ \mathrm{cm}$ and a mass of $60.0\ \mathrm{g}$. What is its density in $\mathrm{g/cm}^3$?

Accepted Answer

$2.0\ \mathrm{g/cm}^3$

Question 8

Which of the following is the correct formula for carbon monoxide?

Accepted Answer

CO

Question 9

Solve for $x$ in the equation $2x + 4 = 14$.

Accepted Answer

$x = 5$

Question 10

Which of the following best describes the arrangement of particles in a solid, liquid, and gas, respectively?

Accepted Answer

Closely packed and fixed; closely packed but able to move; far apart and moving freely

Question 11

A sample contains $2.0 	imes 10^3$ mL. Express this volume in liters.

Accepted Answer

$2.0$ L

Question 12

Which of the following is the correct rearrangement of the density equation $d = \frac{m}{V}$ to solve for $V$?

Accepted Answer

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

Question 13

A student rounds the number 0.08250873 to three significant figures. What is the correct result?

Accepted Answer

0.0825

Question 14

Which of the following is the correct answer to $(3.24 	imes 10^4) + (2.40 	imes 10^3)$, expressed in scientific notation with the correct number of significant figures?

Accepted Answer

$5.6 	imes 10^4$

Question 15

Which of the following best describes a physical change?

Accepted Answer

Dissolving sugar in water

Question 16

If a measurement is recorded as 645 mL, how many significant figures does it have?

Accepted Answer

3

Question 17

A solution is prepared by dissolving 5.0 g of salt in 95.0 g of water. Which of the following best describes the resulting mixture?

Accepted Answer

Mixture

Question 18

Which of the following is the correct value for $(2.0 	imes 10^3) 	imes (4.0 	imes 10^2)$?

Accepted Answer

$8.0 	imes 10^4$

Question 19

Which of the following is the correct chemical formula for a molecule containing two nitrogen atoms?

Accepted Answer

N$_2$

CHEM 107: Problem Solving and Fundamental Concepts (Ch. 1–4) Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards