Question 1

Which of the following statements best describes the Law of Definite Proportions?

Accepted Answer

A compound always contains the same elements in the same ratio by mass.

Question 2

A student finds a nugget with a mass of 163 g. When placed in a graduated cylinder containing 50.0 mL of water, the water level rises to 58.5 mL. What is the density of the nugget in $$\mathrm{g/cm^3$}$$, and does it match pure gold ($$19.3\ \mathrm{g/cm^3$}$$)?

Accepted Answer

$$\dfrac{163\ \mathrm{g}}{8.5\ \mathrm{cm^3$}} = 19.2\ \mathrm{g/cm^3$}$$; Yes, it matches pure gold.

Question 3

Which of the following is NOT considered matter?

Accepted Answer

Light

Question 4

Which statement about Dalton’s Atomic Theory is FALSE?

Accepted Answer

Atoms of a given element can be chemically changed into atoms of another element.

Question 5

A sample contains only one kind of atom. Which classification best describes this sample?

Accepted Answer

Element

Question 6

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

Accepted Answer

Iron rusts when exposed to oxygen.

Question 7

Which of the following mixtures is heterogeneous?

Accepted Answer

Sand and iron filings

Question 8

Convert $$2.73\ \mathrm{K} ($$the temperature of interstellar space) to degrees Celsius.

Accepted Answer

$$2.73 - 273.15 = -270.42^\circ\mathrm{C}$$

Question 9

Which of the following is an extensive property?

Accepted Answer

Volume

Question 10

A student measures the mass of a sample five times and gets: 2.5270 g, 2.5271 g, 2.5272 g, 2.5271 g, 2.5271 g. What does this indicate about the measurements?

Accepted Answer

The measurements are precise.

Question 11

Which of the following is the correct scientific notation for the number 0.000314?

Accepted Answer

$$3.14 	imes 10$$^{-4}$$

Question 12

How many significant figures are in the measurement 0.00340?

Accepted Answer

3

Question 13

Which conversion factor would you use to convert inches to centimeters?

Accepted Answer

$$1\ \mathrm{in} = 2.54\ \mathrm{cm} ($$exactly)

Question 14

A compound contains 40 g of carbon and 60 g of oxygen. What is the mass ratio of oxygen to carbon?

Accepted Answer

$$\dfrac{60}{40} = 1.5$$

Question 15

Which of the following is a pure substance?

Accepted Answer

Distilled water

Question 16

Which of the following is a correct statement about compounds?

Accepted Answer

Compounds can be broken down into simpler substances by chemical means.

Question 17

Which of the following is the correct formula for density?

Accepted Answer

$$d = \dfrac{m}{V}$$

Question 18

A student adds 3.18 L and 0.01315 L. What is the correct answer with the proper number of significant figures?

Accepted Answer

3.19 L

Question 19

Which of the following is a homogeneous mixture?

Accepted Answer

Air inside a party balloon

Question 20

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

Accepted Answer

12 eggs in a carton

Chapter 1: Essential Ideas – Matter and Measurement (General Chemistry)

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