Question 1

Which of the following best describes a compound?

Accepted Answer

Matter composed of two or more different elements that are chemically bonded together.

Question 2

Which of the following is a chemical property?

Accepted Answer

It reacts explosively with oxygen gas.

Question 3

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

Accepted Answer

Tearing a piece of paper.

Question 4

Which of the following is a homogeneous mixture?

Accepted Answer

Soda

Question 5

Which of the following is NOT a physical property?

Accepted Answer

An iron bar rusts.

Question 6

Which of the following is NOT an example of an intensive property?

Accepted Answer

Milligrams

Question 7

Which of the following is an extensive property of a nitrogen molecule?

Accepted Answer

Moles

Question 8

What is the correct formula for converting Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 9

Which of the following scientific notation values is written correctly?

Accepted Answer

$$5.220 x 10^3$$

Question 10

If a copper wire (density = 8.96 $$g/cm^3) $$has a diameter of 0.32 mm and 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 $$density = \frac{mass}{volume})$$

Accepted Answer

301 cm

Question 11

A piece of unknown solid weighs approximately 0.045 lbs. When placed 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? ($$1 	ext{ lb} = 453.6 	ext{ g})$$

Accepted Answer

0.78 g/mL

Question 12

Which of the following is a chemical change?

Accepted Answer

Cooking an egg

Question 13

Which of the following is classified as an extensive property?

Accepted Answer

Chemical Energy

Question 14

Convert 377,000 to scientific notation.

Accepted Answer

$$3.77 	imes 10^5$

Question 15

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 one bottle?

Accepted Answer

0.0120 kg

Question 16

Which of the following is NOT a pure substance?

Accepted Answer

Gatorade

Question 17

Which of the following is a reversible change?

Accepted Answer

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

Question 18

What is the correct number of significant figures in the measurement 3,482,005 mg?

Accepted Answer

7

Question 19

Which of the following is the correct formula for density?

Accepted Answer

$$density = \frac{mass}{volume}$$

General Chemistry: Matter, Properties, Measurements, and Calculations

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