$\text{Percentage} = \dfrac{\text{Part}}{\text{Total}} \times 100$

Question 1

Which of the following best describes a chemical, as defined in GOB Chemistry?

Accepted Answer

A substance that has a fixed composition and properties wherever it is found.

Question 2

Which of the following is NOT a recommended strategy for effective learning in chemistry?

Accepted Answer

Cramming all content the night before the exam.

Question 3

A person has about $1.5 	imes 10^5$ hairs on their scalp. Which of the following numbers is equivalent to this in standard notation?

Accepted Answer

$150,000$

Question 4

Which equation correctly represents the calculation of a percentage?

Accepted Answer

$	ext{Percentage} = \dfrac{	ext{Part}}{	ext{Total}} 	imes 100$

Question 5

A bullet used in forensic testing contains $3.5$ g of lead in a total mass of $11.6$ g. What is the percentage of lead in the bullet?

Accepted Answer

$32.1\%$

Question 6

Which of the following is the correct scientific notation for $0.000089$?

Accepted Answer

$8.9 	imes 10^{-5}$

Question 7

Which of the following is NOT a key math skill required in GOB Chemistry?

Accepted Answer

Memorizing the periodic table without understanding.

Question 8

Given the equation $T = 2.1V + 32$, what is the value of $T$ when $V = 8$?

Accepted Answer

$48.8$

Question 9

Which of the following is the correct scientific notation for $45000$?

Accepted Answer

$4.5 	imes 10^4$

Question 10

When solving the equation $2x + 5 = 13$, what is the value of $x$?

Accepted Answer

$x = 4$

Question 11

Which of the following is a real-world example of a chemical as defined in GOB Chemistry?

Accepted Answer

Table salt (sodium chloride) used in cooking.

Question 12

Which of the following is the correct way to express $0.00780$ in scientific notation?

Accepted Answer

$7.80 	imes 10^{-3}$

Question 13

Which of the following is a common mistake to avoid when studying chemistry?

Accepted Answer

Trying to memorize everything without understanding.

Question 14

If $-12 + (-5) - (-3) = x$, what is the value of $x$?

Accepted Answer

$-14$

Question 15

Which of the following best describes the study of chemistry?

Accepted Answer

The study of the composition, structure, properties, and reactions of matter.

Question 16

A scientist measures the mass of a sample as $2.45 	imes 10^{-2}$ kg. What is this value in grams?

Accepted Answer

$24.5$ g

Question 17

Which of the following is the correct way to solve for $x$ in the equation $3x - 7 = 11$?

Accepted Answer

$x = 6$

Question 18

Which of the following is the correct scientific notation for $0.0000065$?

Accepted Answer

$6.5 	imes 10^{-6}$

Question 19

Which of the following is a recommended approach to learning chemistry?

Accepted Answer

Practice, practice, practice solving problems.

Question 20

A class has 32 students, and 8 of them are wearing lab coats. What percentage of the class is wearing lab coats?

Accepted Answer

$25\%$

Chapter 1: Chemistry in Our Lives – Foundational Concepts and Math Skills

Study Guide - Practice Questions