Q: A cube has an edge length of 6.4 in. What is the volume of the cube in $$\mathrm{cm^3$}$$? (1 in = 2.54 cm)

$$4.3 \times 10^3$\ \mathrm{cm^3$}$$

Question 1

Which of the following best describes why carbon monoxide (CO) is dangerous to humans?

Accepted Answer

CO binds to hemoglobin more strongly than oxygen, reducing oxygen transport in the blood.

Question 2

Which of the following statements is a scientific law?

Accepted Answer

Matter is neither created nor destroyed in a chemical reaction.

Question 3

A student observes that the mass of a closed container does not change during combustion. What is the best hypothesis to explain this observation?

Accepted Answer

During combustion, matter is conserved and only changes form.

Question 4

Which of the following is an example of a physical change?

Accepted Answer

Water boiling to form steam.

Question 5

Which of the following is a heterogeneous mixture?

Accepted Answer

Wet sand

Question 6

Which separation technique would best separate a mixture of sand and water?

Accepted Answer

Filtration

Question 7

A sample of gasoline is burned in air. Which of the following is a chemical property of gasoline?

Accepted Answer

Its flammability

Question 8

Which of the following numbers has four significant figures?

Accepted Answer

0.7180

Question 9

A cube has an edge length of 6.4 in. What is the volume of the cube in $$\mathrm{cm^3$}$$? (1 in = 2.54 cm)

Accepted Answer

$$4.3 	imes 10^3$\ \mathrm{cm^3$}$$

Question 10

A solution has a mass of 13.5 g and a volume of 15.8 mL. What is its density?

Accepted Answer

$$0.854\ \mathrm{g/mL}$$

Question 11

Which of the following is an intensive property?

Accepted Answer

Density

Question 12

A sick child has a temperature of $$40.00\ ^\circ\mathrm{C}. $$What is the child’s temperature in Kelvin?

Accepted Answer

$$313.15\ \mathrm{K}$$

Question 13

Which of the following best describes the difference between a scientific law and a scientific theory?

Accepted Answer

A law summarizes a series of related observations, while a theory gives the underlying reasons for them.

Question 14

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 15

Which of the following is the correct formula to convert Celsius to Fahrenheit?

Accepted Answer

$$^\circ\mathrm{F} = 1.8(^\circ\mathrm{C}) + 32$$

Question 16

A 747 is fueled with $$173,231\ \mathrm{L} of $$jet fuel with a density of $$0.768\ \mathrm{g/cm^3$}. $$What is the mass of the fuel in kilograms? (1 L = 1000 cm$$^3)$$

Accepted Answer

$$133,100\ \mathrm{kg}$$

Question 17

Which of the following is the smallest quantity?

Accepted Answer

1 mg

Question 18

Which of the following best describes the compressibility of gases compared to solids?

Accepted Answer

Gases are compressible because their particles are far apart, while solids are not.

Question 19

Which of the following is a chemical change?

Accepted Answer

Propane burning in air

Chapter 1: Matter, Measurement, and Problem Solving – General Chemistry Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard