Q: A student measures the mass of a rock as 25.70 g and its volume as 10.0 mL. What is the density of the rock, and how many significant figures should the answer have?

$$2.57 \\ \text{g/mL}$$, 3 significant figures

Q: Which of the following is the correct formula for density?

$$\\text{Density} = \\frac{\\text{mass}}{\\text{volume}}$$

Question 1

Which of the following best describes a chemical property?

Accepted Answer

The ability of a substance to react with oxygen to form a new substance.

Question 2

A student measures the mass of a rock as 25.70 g and its volume as 10.0 mL. What is the density of the rock, and how many significant figures should the answer have?

Accepted Answer

$$2.57 \ 	ext{g/mL}$$, 3 significant figures

Question 3

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

Accepted Answer

Dissolving sugar in water.

Question 4

Which statement correctly distinguishes between mass and weight?

Accepted Answer

Mass is a measure of the amount of matter, while weight depends on gravity.

Question 5

A sample of gold has a mass of 96.5 g and a volume of 5.00 mL. What is its density?

Accepted Answer

$$19.3 \ 	ext{g/mL}$$

Question 6

Which of the following is a pure substance?

Accepted Answer

Oxygen gas ($$O_2)$$

Question 7

Convert $$3.25 \ 	imes 10^4$ to standard notation.

Accepted Answer

32,500

Question 8

Which of the following best describes a compound?

Accepted Answer

A pure substance formed by chemically combining two or more elements.

Question 9

A student adds 2.50 mL of water to 1.75 mL of ethanol. What is the total volume, reported with the correct number of significant figures?

Accepted Answer

$$4.3 \ 	ext{mL}$$

Question 10

Which of the following is NOT a physical property?

Accepted Answer

Ability to rust

Question 11

A block of ice floats on water. Which property explains this phenomenon?

Accepted Answer

Ice has a lower density than water.

Question 12

Which of the following is the correct formula for density?

Accepted Answer

$$\text{Density} = \frac{\text{mass}}{\text{volume}}$$

Question 13

Which of the following is a mixture?

Accepted Answer

Air

Question 14

A student records a measurement as 0.00450 g. How many significant figures does this value have?

Accepted Answer

3

Question 15

Which of the following statements about the states of matter is correct?

Accepted Answer

Solids have a definite shape and volume.

Question 16

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

Accepted Answer

Burning gasoline in a car engine

Question 17

What is the specific gravity of a liquid with a density of $$1.25 \ 	ext{g/mL}$$? (Density of water = $$1.00 \ 	ext{g/mL})$$

Accepted Answer

$$1.25$$

Question 18

Which of the following is the correct scientific notation for 0.00056?

Accepted Answer

$$5.6 \times 10$$^{-4}$$

Question 19

Which of the following is a correct statement about elements?

Accepted Answer

Elements are pure substances consisting of only one type of atom.

Question 20

A student needs to convert 250 cm to meters using a conversion factor. Which is the correct answer?

Accepted Answer

$$0.25 \ 	ext{m}$$

Matter and Measurement: Foundations for General Biology and Chemistry

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