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

Question 1

Which of the following best defines a chemical as used in chemistry?

Accepted Answer

A substance that always has the same composition and properties.

Question 2

Which of the following is NOT considered a chemical?

Accepted Answer

Heat

Question 3

A forensic scientist analyzes a white powder found at a crime scene. Which property would be LEAST useful in identifying the substance?

Accepted Answer

The temperature of the room where it was found

Question 4

Which of the following is an example of chemistry in everyday life?

Accepted Answer

All of the above

Question 5

Which branch of chemistry would most likely study the chemical composition of rocks and minerals?

Accepted Answer

Geochemistry

Question 6

Which step of the scientific method is being described: 'A blender does not work when plugged in'?

Accepted Answer

Observation

Question 7

Why is heat not considered a chemical, even though it can cause substances to react?

Accepted Answer

Heat is a form of energy and does not have a definite composition and properties.

Question 8

Which statement about the scientific method is correct?

Accepted Answer

A hypothesis must be testable by experiments.

Question 9

Paracelsus, a historical figure in chemistry, is known for which of the following beliefs?

Accepted Answer

The right dose makes the difference between a poison and a cure.

Question 10

Which of the following is an effective study strategy for learning chemistry?

Accepted Answer

Working problems with a study group

Question 11

A nurse observes that a child’s body temperature decreases after administering Tylenol. Which step of the scientific method does this represent?

Accepted Answer

Observation

Question 12

Which of the following numbers is correctly written in scientific notation?

Accepted Answer

$$ 5.2 	imes 10$$^{-2}$$ $$

Question 13

Convert $$ 3.6 	imes 10$$^{4}$$  to $$standard notation.

Accepted Answer

36,000

Question 14

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 15

Which of the following best describes a direct relationship as seen in a line graph?

Accepted Answer

As one variable increases, the other variable increases.

Question 16

What is the place value of the digit 7 in the number 482.57?

Accepted Answer

Hundredths

Question 17

Which of the following equations correctly solves for $$ x  in$$ $$ 2x + 8 = 14 $$?

Accepted Answer

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

Question 18

Which of the following is a reason why repeated experiments are important in the scientific method?

Accepted Answer

They help determine if results are consistent and reproducible.

Question 19

A student adds $$ -5 $$ and $$ +8 . $$What is the result and its sign?

Accepted Answer

$$ +3 $$

Question 20

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

Accepted Answer

Skipping lectures regularly

Chapter 1: Chemistry in Our Lives – Study Notes

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