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

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

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