Question 1

Which of the following best describes an extensive property of matter?

Accepted Answer

Mass, because it depends on the amount of substance present.

Question 2

A student measures the mass of a penny as 2.5270 g. Which statement about this measurement is correct?

Accepted Answer

It is a measured number and carries uncertainty based on the instrument used.

Question 3

Which of the following is a chemical property?

Accepted Answer

Ability of iron to react with oxygen to form rust.

Question 4

Which statement correctly distinguishes between a compound and a mixture?

Accepted Answer

A compound is composed of elements chemically bonded in fixed ratios, while a mixture can be separated by physical means.

Question 5

Which of the following is the correct chemical formula for carbon dioxide?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 6

A sample of jet fuel has a mass of 16,100 kg and a density of 0.80 kg/L. What is its volume in liters?

Accepted Answer

$$\displaystyle \frac{16,100\ \mathrm{kg}}{0.80\ \mathrm{kg/L}} = 20,125\ \mathrm{L}$$

Question 7

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

Accepted Answer

Salad dressing with oil and vinegar

Question 8

Which step in the COAST method involves checking if your answer is reasonable and viable?

Accepted Answer

Think About It

Question 9

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

Accepted Answer

Kelvin ($$\mathrm{K})$$

Question 10

Which equation correctly expresses the relationship for work done by a force over a distance?

Accepted Answer

$$w = F 	imes d$$

Question 11

A measurement is said to be precise if:

Accepted Answer

It is reproducibly close to the same value each time.

Question 12

Which of the following best describes a molecule?

Accepted Answer

A collection of chemically bonded atoms.

Question 13

Which of the following is a physical property?

Accepted Answer

Density of water at $$25^{\circ}$$\mathrm{C}$$.

Question 14

Which of the following is the correct formula for kinetic energy?

Accepted Answer

$$KE = \frac{1}{2}mv^2$

Question 15

Which of the following statements about energy is correct?

Accepted Answer

Energy is always conserved and can only be converted from one form to another.

Question 16

Which of the following is a correct example of a chemical formula representing a compound?

Accepted Answer

$$\mathrm{NaCl}$$

Question 17

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

Accepted Answer

The result should have the same number of significant figures as the value with the fewest significant figures.

Question 18

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture that is uniform throughout, like vinegar.

Question 19

Which of the following is the correct SI base unit for amount of substance?

Accepted Answer

Mole ($$\mathrm{mol})$$

Question 20

Which of the following is NOT a step in the COAST method for problem solving?

Accepted Answer

Estimate

Chapter 1: Matter and Energy – Foundations for General Biology

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