$$22\ \mathrm{mi} \times 1.6093\ \mathrm{km/mi} = 35.4046\ \mathrm{km}$$

Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout the sample.

Question 2

Which separation technique would be most appropriate to separate a mixture of sand and water?

Accepted Answer

Filtration

Question 3

A student measures the mass of a cube as 55.45 g and its volume as 7.87 mL. What is the density of the cube?

Accepted Answer

$$\frac{55.45\ \mathrm{g}}{7.87\ \mathrm{mL}} = 7.05\ \mathrm{g/mL}$$

Question 4

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

Accepted Answer

A copper penny reacts with nitric acid to form a blue solution and a brown gas.

Question 5

Which property is intensive?

Accepted Answer

Density

Question 6

Convert 22 miles to kilometers. ($$1\ \mathrm{mi} = 1.6093\ \mathrm{km})$$

Accepted Answer

$$22\ \mathrm{mi} 	imes 1.6093\ \mathrm{km/mi} = 35.4046\ \mathrm{km}$$

Question 7

Which of the following is a compound?

Accepted Answer

Water ($$\mathrm{H_2O})$$

Question 8

A sample of ethanol has a mass of 10.0 g and a density of $$0.79\ \mathrm{g/cm^3$}. $$What is its volume?

Accepted Answer

$$\frac{10.0\ \mathrm{g}}{0.79\ \mathrm{g/cm^3$}} = 12.7\ \mathrm{cm^3$}$$

Question 9

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 10

Which of the following statements about significant figures is correct?

Accepted Answer

Zeroes at the end of a number are significant if the number contains a decimal point.

Question 11

A student adds $$33.1 + 21.104 + 73.22. $$What is the answer rounded to the correct number of decimal places?

Accepted Answer

$$127.4$$

Question 12

Which of the following best describes the difference between accuracy and precision?

Accepted Answer

Accuracy refers to how close measurements are to the true value, while precision refers to how close measurements are to each other.

Question 13

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 14

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 15

Which of the following is the correct formula for converting Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 16

A 12 fl oz can of soda contains 355 mL. How many liters is this?

Accepted Answer

$$355\ \mathrm{mL} \div 1000 = 0.355\ \mathrm{L}$$

Question 17

Which of the following best describes the energy transformation when a cyclist rides down a hill?

Accepted Answer

Potential energy is converted to kinetic energy.

Question 18

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

A bowl of cereal with milk

Question 19

Which of the following is the correct SI unit for measuring temperature?

Accepted Answer

Kelvin (K)

Question 20

Which of the following statements about compounds is correct?

Accepted Answer

Compounds have a definite composition and can be decomposed into simpler substances.

Chapter 1: Introduction to Matter, Energy, and Measurement

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