Question 1

Which of the following best defines a chemical as described in Chapter 1?

Accepted Answer

A substance that has the same composition and properties wherever it is found.

Question 2

Which of the following is an example of a chemical used in toothpaste to inhibit bacteria that cause plaque and gum disease?

Accepted Answer

Stannous fluoride

Question 3

A bullet is found to contain 0.5 g tin, 11.6 g lead, and 0.4 g antimony. What is the percentage of lead in the bullet? Use the formula $$	ext{Percent} = \frac{	ext{Part}}{	ext{Total}} 	imes 100\%.$$

Accepted Answer

88.4%

Question 4

Which of the following actions is NOT recommended for successful learning in chemistry?

Accepted Answer

Procrastinating on assignments

Question 5

Which mathematical operation is correctly solved according to the rules for positive and negative numbers: $$-12 - (-5)$$?

Accepted Answer

$$-12 + 5 = -7$$

Question 6

A student calculates the percentage of students wearing Iowa shirts in a class. If 5 out of 20 students wear Iowa shirts, what is the percentage? Use $$	ext{Percent} = \frac{5}{20} 	imes 100\%.$$

Accepted Answer

25%

Question 7

Which of the following is the correct scientific notation for 425000?

Accepted Answer

$$4.25 	imes 10^5$

Question 8

Which of the following is the correct scientific notation for 0.00000039?

Accepted Answer

$$3.9 	imes 10$$^{-7}$$

Question 9

Which of the following is the correct scientific notation for 0.00730?

Accepted Answer

$$7.3 	imes 10$$^{-2}$$

Question 10

A temperature conversion equation is given by $$T_F = 1.8T_C + 32. $$What is $$T_F$$ when $$T_C = 100$$?

Accepted Answer

$$212$$

Question 11

Which of the following is a real-world example of a chemical reaction discussed in Chapter 1?

Accepted Answer

A tablet dissolving in water and producing bubbles

Question 12

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

Accepted Answer

Highlighting or underlining everything in your textbook

Question 13

Which of the following toothpaste ingredients is used to make toothpaste white and opaque?

Accepted Answer

Titanium dioxide

Question 14

A scientist analyzes bodily fluids in a crime laboratory. Which branch of chemistry is most directly involved in this work?

Accepted Answer

Forensic chemistry

Question 15

Which of the following is the correct way to rearrange and solve the equation $$2x + 8 = 14$$ for $$x$$?

Accepted Answer

$$x = \frac{14 - 8}{2}$$

Question 16

Which of the following is a key math skill emphasized in Chapter 1 for success in chemistry?

Accepted Answer

Interpreting graphs

Question 17

A person has about $$1 	imes 10^5$ hairs on their head. Each hair is about 8$$ 	imes $$10^{-5} m $$wide. What is the total width of all hairs in meters?

Accepted Answer

$$8 	imes 10^0$ m

Question 18

Which of the following is a misconception about chemicals as discussed in Chapter 1?

Accepted Answer

Chemicals are only found in laboratories and are not part of daily life.

Question 19

Which of the following is the correct way to enter a number in scientific notation into a calculator?

Accepted Answer

Using the EXP or EE key

Question 20

Which of the following is a recommended way to make your studying and learning active in chemistry?

Accepted Answer

Practicing problem-solving regularly

Chapter 1 – Chemistry in Our Lives: Key Concepts and Applications

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