Density Test Questions

Chemistry Test Questions

Density is mass per unit volume.
Density is mass per unit volume. Stephen Oliver / Getty Images

This is a collection of ten chemistry test questions with answers dealing with the density of matter. The answers for each question are at the bottom of the page.

Question 1

Density can be used to predict which substance will float on another.
Density can be used to predict which substance will float on another. Stephen Oliver / Getty Images
500 grams of sugar occupies a volume of 0.315 L. What is the density of the sugar in g/mL?

Question 2

The density of a substance is 1.63 g/mL. What is the mass of 0.25 L of the substance in grams?

Question 3

The density of pure solid copper is 8.94 g/mL. What volume does 5 kg of copper occupy?

Question 4

What is the mass of a 450 cm³ block of silicon if the density of silicon is 2.336 g/cm³?

Question 5

What is the mass of a 15 cm cube of iron if the density of iron is 7.87 g/cm³?

Question 6

Which of the following is greater?
a. 7.8 g/mL or 4.1 μg/μL
b. 3 x 10-2 kg/cm3 or 3 x 10-1 mg/cm3

Question 7

Two liquids, A and B, have densities 0.75 g/mL and 1.14 g/mL respectively.
When both liquids are poured into a container, one liquid floats on top of the other. Which liquid is on top?

Question 8

How many kg of mercury would fill a 5 L container if the density of mercury is 13.6 g/cm³?

Question 9

How much does 1 gallon of water weigh in lbs?
Given: Density of water = 1 g/cm³

Question 10

How much space does 1 lb of butter occupy if the density of butter is 0.94 g/cm³?

Answers

1. 1.587 g/mL
2. 407.5 g
3. 559 mL
4. 1051.2 g
5. 26561 g or 26.56 kg
6. a. 7.8 g/mL   b. 3 x 10-2 kg/cm3
7. Liquid A. (0.75 g/mL)
8. 68 kg
9. 8.33 lbs (2.2 kg = 1 lb, 1 L = 0.264 gal)
10. 483.6 cm³

Tips for Answering Density Questions

When you're asked to calculate density, make sure your final answer is given in units of mass (such as grams, ounces, pounds, kilograms) per volume (cubic centimeters, liters, gallons, milliliters). The other potentially tricky part is that you may be asked to give an answer in different units than you're given. It's a good idea to be familiar with how to perform unit conversions when working these problems. The other thing to watch is the number of significant figures in your answer. The number of significant figures will be the same as the number in your least precise value. So, if you have four significant digits for mass but only three significant digits for volume, your density should be reported using three significant figures. Finally, check to make sure your answer is reasonable. One way to do this is to mentally compare your answer against the density of water (1 gram per cubic centimeter). Light substances would float on water, so their density should be less than that of water. Heavy materials should have density values greater than that of water.
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Helmenstine, Todd. "Density Test Questions." ThoughtCo, Jan. 7, 2017, thoughtco.com/density-test-questions-604115. Helmenstine, Todd. (2017, January 7). Density Test Questions. Retrieved from https://www.thoughtco.com/density-test-questions-604115 Helmenstine, Todd. "Density Test Questions." ThoughtCo. https://www.thoughtco.com/density-test-questions-604115 (accessed January 23, 2018).