$$\frac{325}{545} \times 100\% = 59.6\%$$

Question 1

Which of the following best describes the scope of chemistry as a science?

Accepted Answer

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

Question 2

A forensic scientist analyzes a blood sample to determine its chemical composition. Which aspect of chemistry is primarily being applied?

Accepted Answer

Composition

Question 3

Which of the following is NOT considered matter?

Accepted Answer

Light

Question 4

Toothpaste contains several chemicals. Which chemical is responsible for making toothpaste white and opaque?

Accepted Answer

Titanium dioxide

Question 5

Which step of the scientific method involves proposing a possible explanation for an observation?

Accepted Answer

Hypothesis

Question 6

A student observes that a blender does not work when plugged in. What is the next logical step in the scientific method?

Accepted Answer

Formulate a hypothesis about the cause.

Question 7

Which of the following activities is NOT part of a successful study plan for chemistry?

Accepted Answer

Staying out late the night before an exam

Question 8

What is the correct scientific notation for the number 0.000008?

Accepted Answer

$$8 	imes 10$$^{-6}$$

Question 9

If you multiply two negative numbers, such as $$(-2) 	imes (-3)$$, what is the result?

Accepted Answer

$$+6$$

Question 10

A tablet contains 325 mg of aspirin and has a total mass of 545 mg. What is the percentage of aspirin in the tablet?

Accepted Answer

$$\frac{325}{545} 	imes 100\% = 59.6\%$$

Question 11

Which of the following best describes a direct relationship as seen in a graph of volume versus temperature for a gas?

Accepted Answer

Volume increases as temperature increases.

Question 12

Which of the following is an example of a chemical reaction occurring in everyday life?

Accepted Answer

An acid tablet fizzing in water

Question 13

What is the place value of the digit '4' in the number 6.407?

Accepted Answer

Hundredths

Question 14

Which of the following is a correct rearrangement to solve for $$P_1 in $$the equation $$P_1$$ $$V_1$$ = $$P_2$$ $$V_2$$?

Accepted Answer

$$P_1$$ = \frac{$$P_2$$ $$V_2$$}{$$V_1$$}$$

Question 15

Which of the following is a theory rather than a hypothesis or observation?

Accepted Answer

The blender needs repair.

Question 16

Which of the following is the correct scientific notation for the number 7,200,000?

Accepted Answer

$$7.2 	imes 10$$^{6}$$

Question 17

Which of the following is a chemical commonly used in toothpaste to prevent cavities?

Accepted Answer

Sodium fluorophosphate

Question 18

When adding $$+12$$ and $$-15$$, what is the result?

Accepted Answer

$$-3$$

Question 19

Which of the following is a strategy to improve learning and understanding in chemistry?

Accepted Answer

Studying different topics in a chapter and relating new concepts to what you know

Question 20

Which of the following calculator keys is used to enter a number in scientific notation?

Accepted Answer

EXP or EE

Chapter 1: Chemistry in Our Lives – Study Notes

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