Question 1

Which of the following best defines chemistry?

Accepted Answer

The study of matter, including its composition, structure, properties, and reactions.

Question 2

Which of the following is NOT considered a chemical?

Accepted Answer

Sunlight

Question 3

A scientist observes that a plant grows faster when exposed to more sunlight. She proposes that increased sunlight causes increased growth. What step of the scientific method is this?

Accepted Answer

Hypothesis

Question 4

Which statement about scientific laws and theories is correct?

Accepted Answer

A law describes consistent observations, while a theory explains those observations.

Question 5

If you add $$-7$$ and $$12$$, what is the result?

Accepted Answer

$$5$$

Question 6

What is the value of $$6 - (-4)$$?

Accepted Answer

$$10$$

Question 7

A bullet weighs $$15.1\ \mathrm{g}$$ and contains $$13.9\ \mathrm{g} of $$lead. What is the percentage of lead in the bullet? Use $$\% = \frac{	ext{part}}{	ext{whole}} 	imes 100\%.$$

Accepted Answer

$$92\%$$

Question 8

Which of the following best describes the process of encoding information into long-term memory?

Accepted Answer

Actively interacting with material, relating new concepts to prior knowledge, and practicing retrieval.

Question 9

What is the scientific notation for $$0.021$$?

Accepted Answer

$$2.1 	imes 10$$^{-2}$$

Question 10

Given the equation $$8a - 5 = 11$$, what is the value of $$a$$?

Accepted Answer

$$a = 2$$

Question 11

Which of the following is an example of an observation in the scientific method?

Accepted Answer

Recording that a solution turned blue after adding a chemical.

Question 12

If the volume of a balloon increases as the temperature increases, what type of relationship is this?

Accepted Answer

Direct relationship

Question 13

What is the average (mean) of the following numbers: $$23, 39, 24, 33, 28, 42$$?

Accepted Answer

$$31.5$$

Question 14

Which digit is in the hundredths place in the number $$6,343.942$$?

Accepted Answer

$$2$$

Question 15

Which of the following is the correct way to write $$64,000 in $$scientific notation?

Accepted Answer

$$6.4 	imes 10$$^{4}$$

Question 16

A student calculates $$(-2) 	imes 4. $$What is the result?

Accepted Answer

$$-8$$

Question 17

Which of the following best describes a hypothesis?

Accepted Answer

A statement that gives a possible explanation for an observation.

Question 18

If $$x/12 = 9$$, what is the value of $$x$$?

Accepted Answer

$$x = 108$$

Question 19

Which of the following is the best strategy for learning chemistry according to the study materials?

Accepted Answer

Actively testing yourself and relating new concepts to what you already know.

Question 20

A bullet contains $$11.6\ \mathrm{g}$$ lead, $$0.5\ \mathrm{g}$$ tin, and $$0.4\ \mathrm{g}$$ antimony. What is the percentage of tin in the bullet? Use $$\% = \frac{	ext{part}}{	ext{whole}} 	imes 100\%.$$

Accepted Answer

$$4\%$$

Chapter 1: Chemistry in Our Lives – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard