Q: A student needs 455 cm of rope for an art project. The store sells rope for $0.25 per foot. How much will the rope cost? (1 in = 2.54 cm, 1 ft = 12 in)

$$\frac{455\ \mathrm{cm}}{2.54\ \mathrm{cm/in}} \times \frac{1\ \mathrm{in}}{12\ \mathrm{in/ft}} \times 0.25\ \mathrm{\ / ft$$} = 3.74\ \$$

Question 1

Which of the following is NOT considered matter?

Accepted Answer

A beam of light

Question 2

Which statement best describes a chemical change?

Accepted Answer

Atoms or molecules rearrange to form new substances.

Question 3

A student adds a metal to water in a graduated cylinder. The water level rises from 11.73 mL to 12.88 mL. If the mass of the metal is 0.3118 g, what is the density of the metal, reported to the correct number of significant figures?

Accepted Answer

$$\frac{0.3118\ \mathrm{g}}{1.15\ \mathrm{mL}} = 0.271\ \mathrm{g/mL}$$

Question 4

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

Accepted Answer

Density

Question 5

Which statement about plasma is correct?

Accepted Answer

Plasma is a gaseous state containing an appreciable amount of electrically charged particles.

Question 6

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 7

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

Accepted Answer

A popsicle melting on a hot day

Question 8

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; precision refers to how close measurements are to each other.

Question 9

Which of the following numbers has three significant figures?

Accepted Answer

0.00450

Question 10

A student needs 455 cm of rope for an art project. The store sells rope for $0.25 per foot. How much will the rope cost? (1 in = 2.54 cm, 1 ft = 12 in)

Accepted Answer

$$\frac{455\ \mathrm{cm}}{2.54\ \mathrm{cm/in}} 	imes \frac{1\ \mathrm{in}}{12\ \mathrm{in/ft}} 	imes 0.25\ \mathrm{\ / ft$$} = 3.74\ \$$

Question 11

Which of the following is a compound?

Accepted Answer

Water ($$H_2O)$$

Question 12

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

Accepted Answer

Ability to corrode

Question 13

Which of the following statements about phase changes is correct?

Accepted Answer

Phase changes are physical changes and are generally reversible.

Question 14

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

Accepted Answer

$$T_K = T_C + 273.15$$

Question 15

A measurement is recorded as 42.8 mL. How many significant figures does this measurement have?

Accepted Answer

3

Question 16

Which of the following is an example of an exact number?

Accepted Answer

The number of students in a classroom

Question 17

Which of the following is the correct SI base unit for mass?

Accepted Answer

Kilogram (kg)

Question 18

Which of the following statements about dimensional analysis is correct?

Accepted Answer

Units are manipulated mathematically just like numbers.

Question 19

When multiplying and dividing measured values, how do you determine the number of significant figures in the final answer?

Accepted Answer

Use the same number of significant figures as the measurement with the fewest significant figures.

Question 20

A sample of water is heated from 0°C to 100°C. What is the temperature change in kelvin?

Accepted Answer

$$100\ \mathrm{K}$$

Chapter 1: Describing Matter – Foundations of Chemistry

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