Question 1

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

Accepted Answer

Water boiling to form steam

Question 2

Which statement best describes a chemical property?

Accepted Answer

The ability of a substance to undergo a change in composition

Question 3

A student measures the mass of a sample as 15.02 g and its volume as 2.50 mL. What is the density of the sample, and how many significant figures should the answer have?

Accepted Answer

6.01 g/mL, 3 significant figures

Question 4

Which of the following best illustrates the law of conservation of energy?

Accepted Answer

Energy is converted from one form to another, but the total amount remains constant

Question 5

Convert 25°C to Kelvin. Use the correct number of significant figures.

Accepted Answer

$$K = 25 + 273.15 = 298.15 K$$

Question 6

Which SI prefix corresponds to $$10^{-6}$$?

Accepted Answer

micro

Question 7

A chemist records a measurement as 0.00300250 g. How many significant figures does this value have?

Accepted Answer

7

Question 8

Which of the following is a derived SI unit?

Accepted Answer

Pascal

Question 9

A solution contains 0.250 mol of NaCl in 500 mL of water. What is the molar concentration of NaCl?

Accepted Answer

$$c = \frac{0.250}{0.500} = 0.50$$ mol/L

Question 10

Which of the following measurements is the most precise?

Accepted Answer

12.00 g

Question 11

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

Accepted Answer

Iron reacting with oxygen to form rust

Question 12

A student adds 15.0 mL, 213.1 mL, and 103.156 mL. What is the correct sum, rounded to the proper number of decimal places?

Accepted Answer

331.3 mL

Question 13

Which of the following best describes accuracy?

Accepted Answer

How close a measurement is to the actual value

Question 14

Which of the following is NOT a physical property?

Accepted Answer

Combustibility

Question 15

A block has a mass of 250 g and a volume of 100 cm$$^3. $$What is its density in g/cm$$^3$$?

Accepted Answer

$$\frac{250}{100} = 2.5 g/cm$^3$$

Question 16

Which of the following is the correct SI unit for energy?

Accepted Answer

Joule

Question 17

Which of the following is a correct conversion factor for 1 L to cm$$^3$$?

Accepted Answer

1 L = 1000 cm$$^3$$

Question 18

Which of the following is a correct statement about significant figures in multiplication and division?

Accepted Answer

The result should have as many significant figures as the factor with the fewest significant figures

Question 19

Which of the following is a correct SI prefix for $$10^3$$?

Accepted Answer

kilo

Chapter 1: Units of Measurement for Physical and Chemical Change – Study Notes

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