Question 1

Which of the following best describes an intensive property, and which is an example of one?

Accepted Answer

An intensive property does not depend on the amount of substance; density is an example.

Question 2

A student measures the mass of a metal sample as 8.50 g and its volume as 0.425 cm$$^3. $$What is the density of the metal, and how many significant figures should the answer have?

Accepted Answer

$$20.0\ \mathrm{g/cm^3$}$$ with 3 significant figures

Question 3

Which of the following is a chemical change?

Accepted Answer

Hydrogen gas reacting with oxygen gas to form water

Question 4

A sample of seawater has a density of $$1.025\ \mathrm{g/cm^3$}. $$What is this density in $$\mathrm{kg/m^3$}$$?

Accepted Answer

$$1025\ \mathrm{kg/m^3$}$$

Question 5

Which of the following best describes the kinetic-molecular theory as it applies to gases?

Accepted Answer

Gas particles are far apart, move rapidly, and their collisions are responsible for pressure.

Question 6

A chemist needs 250.0 g of ethanol for a reaction. If the density of ethanol is $$0.789\ \mathrm{g/mL}$$, what volume in mL should be measured out? (Give your answer to the correct number of significant figures.)

Accepted Answer

$$317\ \mathrm{mL}$$

Question 7

Which of the following is a correct statement about the law of conservation of energy?

Accepted Answer

Energy can neither be created nor destroyed; it can only be transformed from one form to another.

Question 8

A student records the following measurements of a sample's mass: 2.34 g, 2.35 g, 2.33 g, and 2.34 g. The accepted value is 2.50 g. Which statement best describes the precision and accuracy of these measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 9

Which of the following is a homogeneous mixture?

Accepted Answer

A glass of salt water

Question 10

Which separation technique would be most effective for separating a mixture of colored dyes in black ink?

Accepted Answer

Chromatography

Question 11

A temperature is measured as $$-40.0\ ^\circ\mathrm{C}. $$What is this temperature in Kelvin?

Accepted Answer

$$233.2\ \mathrm{K}$$

Question 12

Which of the following is an example of a derived SI unit?

Accepted Answer

Joule (J)

Question 13

A student adds $$1.26 	imes 10^3$ and 3.71$$ 	imes $$10^1. $$What is the correct answer, expressed with the proper number of significant figures?

Accepted Answer

$$1.30 	imes 10^3$

Question 14

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

Accepted Answer

Density is a physical property.

Question 15

A regular metal cube has a mass of 27.0 g and a side length of 2.00 cm. What is its density in $$\mathrm{g/cm^3$}$$?

Accepted Answer

$$3.38\ \mathrm{g/cm^3$}$$

Question 16

Which of the following is an example of a pure substance?

Accepted Answer

Distilled water

Question 17

Which of the following is the correct conversion factor to convert centimeters to meters?

Accepted Answer

$$1\ \mathrm{m}/100\ \mathrm{cm}$$

Question 18

A scientist is following the scientific method. After making an observation and formulating a hypothesis, what is the next step?

Accepted Answer

Make a prediction based on the hypothesis

Question 19

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

Accepted Answer

The number of students in a classroom

Question 20

A sample of liquid nitrogen boils at 77 K. What is this temperature in degrees Celsius?

Accepted Answer

$$-196\ ^\circ\mathrm{C}$$

Basic Concepts and Tools of Quantitative Chemistry: Introduction and Scientific Method

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