Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements that are chemically bonded together.

Question 2

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

Accepted Answer

A cup of black coffee

Question 3

Which of the following represents a chemical change?

Accepted Answer

Cooking an egg

Question 4

Which of the following is a physical property?

Accepted Answer

Mercury is a silvery liquid at 25ºC.

Question 5

Which of the following is NOT an intensive property?

Accepted Answer

Milligrams

Question 6

Which of the following is an extensive property?

Accepted Answer

Moles

Question 7

What is the correct formula to convert Celsius to Kelvin?

Accepted Answer

$K = ^\circ C + 273.15$

Question 8

How many significant figures are in the measurement 0.003840?

Accepted Answer

4

Question 9

Which of the following scientific notation values is written correctly?

Accepted Answer

5.220 x 10^3

Question 10

A copper wire (density = 8.96 g/cm^3) has a diameter of 0.32 mm. If a sample of this copper wire has a mass of 21.7 g, what is the length of the wire in cm? (Assume the wire is a perfect cylinder. Use $V = \pi r^2 h$ and $d = \frac{m}{V}$)

Accepted Answer

3000 cm

Question 11

Which of the following is a chemical property of hydrogen gas?

Accepted Answer

It reacts explosively with oxygen gas.

Question 12

A piece of unknown solid weighs approximately 0.045 lbs. When a scientist places it in a glass beaker, the water level increases from 200 mL to 260 mL. What is the density of the unknown solid in g/mL? (1 lb = 453.6 g)

Accepted Answer

0.35 g/mL

Question 13

Which of the following is NOT a physical property?

Accepted Answer

An iron bar rusts.

Question 14

Which of the following is a reversible change?

Accepted Answer

Melting a chocolate bar then re-solidifying it in the freezer.

Question 15

Which of the following is the correct formula for density?

Accepted Answer

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

Question 16

A laboratory room has an area of 60 m^2. What is the correct SI unit for area?

Accepted Answer

m^2

Question 17

Which of the following is the correct conversion factor for 1 inch in centimeters?

Accepted Answer

1 inch = 2.54 cm

Question 18

A pharmaceutical drug contains 4.0% active ingredient by mass. If each pill weighs 2.5 g and a bottle contains 120 pills, what is the mass in kg of the active ingredient in the bottle?

Accepted Answer

0.0120 kg

Question 19

Which of the following is the correct formula for converting Fahrenheit to Celsius?

Accepted Answer

$^\circ C = \frac{5}{9}(^\circ F - 32)$

Question 20

Which of the following is an example of a mixture?

Accepted Answer

Orange juice

Introduction to General Chemistry: Classification, Properties, and Measurement of Matter

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