Question 1

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

Accepted Answer

Burning a piece of paper

Question 2

A student measures the mass of a metal cube as 54.0 g and each side as 3.00 cm. What is the density of the metal in $$\mathrm{g/cm^3$}$$?

Accepted Answer

$$2.00\ \mathrm{g/cm^3$}$$

Question 3

Which of the following is an intensive property?

Accepted Answer

Density

Question 4

A sample of water is heated from $$25^\circ\mathrm{C} to$$ $$75^\circ\mathrm{C}. $$Which of the following best describes this process?

Accepted Answer

A physical change

Question 5

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 6

Convert $$0.00567 kg to mg $$using metric prefixes.

Accepted Answer

$$5.67 	imes 10^6$ mg

Question 7

Which of the following statements about physical and chemical properties is correct?

Accepted Answer

Chemical properties describe how a substance interacts with other substances.

Question 8

A student records the following measurements: $$12.30 g$$, $$0.045 g$$, and $$1.2 g. $$How many significant figures should the sum have?

Accepted Answer

2

Question 9

Which of the following is a pure substance?

Accepted Answer

Distilled water

Question 10

A block of metal has a mass of $$250 g $$and displaces $$32.0 mL of $$water. What is its density in $$\mathrm{g/mL}$$?

Accepted Answer

$$7.81\ \mathrm{g/mL}$$

Question 11

Which of the following best describes the process of dissolving sugar in water?

Accepted Answer

A physical change that is reversible

Question 12

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

Accepted Answer

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

Question 13

A student needs to convert $$3.50$$ inches to centimeters. Which conversion factor should they use?

Accepted Answer

$$1\ \mathrm{in} = 2.54\ \mathrm{cm}$$

Question 14

Which of the following is an extensive property?

Accepted Answer

Volume

Question 15

A solution is prepared by mixing $$50.0 mL of $$ethanol and $$50.0 mL of $$water. The resulting mixture is best classified as:

Accepted Answer

A homogeneous mixture

Question 16

Express $$0.000668 in $$scientific notation with the correct number of significant figures.

Accepted Answer

$$6.68 	imes 10$$^{-4}$$

Question 17

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound consists of atoms chemically bonded, while a mixture consists of substances physically combined.

Question 18

A student wants to find the mass of a gold ring with a volume of $$2.50\ \mathrm{cm^3$}$$ and a density of $$19.3\ \mathrm{g/cm^3$}. $$What is the mass?

Accepted Answer

$$48.3\ \mathrm{g}$$

Question 19

Which of the following is NOT a base SI unit?

Accepted Answer

Liter

Question 20

A nurse needs to administer $$0.250 L of $$saline solution. How many milliliters is this?

Accepted Answer

$$250 mL$$

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