$$\frac{5}{100} \times 100\% = 5\%$$

Question 1

Which of the following best defines chemistry?

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

A forensic scientist analyzes a blood sample to identify a chemical substance. Which property of chemicals allows this analysis to be reliable?

Accepted Answer

Chemicals have the same composition and properties wherever found.

Question 4

Which of the following is an example of a chemical reaction you might observe in daily life?

Accepted Answer

An antacid tablet fizzing in water

Question 5

Which of the following activities is NOT recommended for an effective chemistry study plan?

Accepted Answer

Skipping class

Question 6

Which of the following is an observation according to the scientific method?

Accepted Answer

Your trainer records that you ran for 25 minutes on the treadmill.

Question 7

A student reads that the volume of a gas increases as temperature increases. What type of relationship is this?

Accepted Answer

Direct relationship

Question 8

What is the place value of the underlined digit in the number 35.679 (the 7 is underlined)?

Accepted Answer

Hundredths

Question 9

Which of the following calculations is correct according to the rules for multiplying positive and negative numbers?

Accepted Answer

$$2 	imes (-3) = -6$$

Question 10

A solution contains 5 red balls out of 100 balls. What is the percentage of red balls?

Accepted Answer

$$\frac{5}{100} 	imes 100\% = 5\%$$

Question 11

Solve for $$x in $$the equation $$2x + 8 = 14.$$

Accepted Answer

$$x = 3$$

Question 12

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

Accepted Answer

$$6.4 	imes 10^4$

Question 13

A virus has a diameter of $$0.0000003 m. $$How is this written in scientific notation?

Accepted Answer

$$3 	imes 10$$^{-7}$$ m

Question 14

Which of the following is a hypothesis according to the scientific method?

Accepted Answer

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

Question 15

Which of the following is a recommended strategy for learning chemistry?

Accepted Answer

Self-testing by giving yourself quizzes

Question 16

If $$-12 - (-5) is $$calculated, what is the result?

Accepted Answer

$$-7$$

Question 17

Which of the following best describes a chemical found in toothpaste and its function?

Accepted Answer

Calcium carbonate is used as an abrasive to remove plaque.

Question 18

A graph shows the volume of a gas increasing as temperature increases. What does the slope of the line represent?

Accepted Answer

A direct relationship between volume and temperature

Question 19

Which of the following is the correct way to enter $$2.5 	imes 10$$^{-4}$$ into a scientific calculator?

Accepted Answer

2.5 EXP -4

Question 20

Which of the following is a conclusion according to the scientific method?

Accepted Answer

Scientific studies show that exercising lowers blood pressure.

Chapter 1: Chemistry in Our Lives – Study Notes

Guida di studio - Domande di pratica