Question 1

Which of the following best describes the main focus of chemistry as a science?

Accepted Answer

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

Question 2

Which of the following is NOT considered matter?

Accepted Answer

Sunlight

Question 3

Which of the following is an example of a chemical as defined in chemistry?

Accepted Answer

Toothpaste

Question 4

A student observes that a tablet fizzes when dropped in water. According to the scientific method, what is the next logical step?

Accepted Answer

Form a hypothesis explaining why the tablet fizzes.

Question 5

Which of the following statements is a hypothesis?

Accepted Answer

Your doctor thinks that your weight loss is due to increased exercise.

Question 6

Which step in the scientific method involves testing a proposed explanation?

Accepted Answer

Experiment

Question 7

A researcher notices that a patient sneezes only when visiting homes with cats. What is the best conclusion based on repeated experiments?

Accepted Answer

The patient is allergic to cats.

Question 8

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

Accepted Answer

$$2.4 	imes 10^3$

Question 9

Convert 0.00086 to scientific notation.

Accepted Answer

$$8.6 	imes 10$$^{-4}$$

Question 10

Which of the following is an example of applying the scientific method in a real-life scenario?

Accepted Answer

Noticing that you sneeze around cats, hypothesizing you are allergic, and testing this by visiting homes with and without cats.

Question 11

Which of the following best describes a chemical reaction?

Accepted Answer

A process in which substances interact to form new substances with different properties.

Question 12

Which of the following is the correct scientific notation for 64,000?

Accepted Answer

$$6.4 	imes 10^4$

Question 13

A scientist proposes that a new medication will lower blood pressure. What is this proposal called in the scientific method?

Accepted Answer

Hypothesis

Question 14

Which of the following is NOT a step in the scientific method?

Accepted Answer

Ignoring data that does not fit the hypothesis

Question 15

Which of the following best describes the term 'chemicals' as used in chemistry?

Accepted Answer

Substances that have the same composition and properties wherever found.

Question 16

Which of the following is an example of a conclusion in the scientific method?

Accepted Answer

Scientific studies show that exercising lowers blood pressure.

Question 17

Which of the following is the correct scientific notation for the diameter of a human hair, 0.000008 m?

Accepted Answer

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

Question 18

A student enters $$2.5 	imes 10$$^{-4}$$ into a calculator. Which of the following is a possible calculator display?

Accepted Answer

2.5E-04

Question 19

Which of the following is an observation?

Accepted Answer

During your visit to the gym, your trainer records that you ran for 25 min on the treadmill.

Question 20

Which of the following best illustrates the use of scientific notation in a real-world context?

Accepted Answer

Expressing the number of hairs on a human scalp as $$1 	imes 10^5$

Chapter 1: Chemistry in Our Lives – Study Notes

Guida di studio - Domande di pratica