Density Study Guide – Answer Key



Density Study Guide -2011

As you study, be sure to review the following:

• Notebook pages p. 38-59

• Density Powerpoint

• Density Notes (handout)

• Inquiry 2.1: Measuring the Mass and Volume of Water (Density of Water)

• Inquiry 2.2: Comparing the Densities of Different Substances (Density of blocks of wax, plastic, and aluminum)

• Inquiry 2.3: Measuring the Densities of Irregular Objects (Density of nylon spacer, steel screw, and copper cylinder)

• Inquiry 3.1: Using Density to Make Predictions (Building a Density Column)

• Inquiry 4.1: Density of Air

• Mysterious Cylinders Lab Investigation

• Camp Mason and Density Practice Problems

• Constructing Models of Matter

• Density Study Guide

1. What is the equation for density? What are units for density?

2. Find the density of a block that has a mass of 108 g and a volume of 100 cm3.

3. If an object has a density of 10 g/cm3 and a mass of 0.5 g, what is its volume?

4. If an object has a volume of 10 cm3 and a density of 11.4 g/cm3, what is its mass?

5. A solid block is 2 cm x 2.5 cm x 9 cm. How much water would it displace if you used the water displacement method to determine its volume? Could you determine the object’s density? Why or why not?

6. Corn syrup has a density of 1.5 g/mL. A 200 mL glass container filled with corn syrup has a mass of 330 g. What is the mass of the container alone?

7. How large a container would you need to hold 100 g of a liquid that has a density of 5 g/cm3?

8. Why do some objects float in water, while others sink?

9. Explain why the density of water is 1 g/cm3?

Two Pan Balance

10. The density of Substance #2 is greater than the density of Substance #1.

a. If equal volumes of Substance #1 and Substance #2 were put on a two pan balance, which way would it tip and why? Draw a picture of the balance with the substances on it.

b. If equal masses of Substance #1 and Substance #2 were put on the balance, which way would it tip and why? Draw a picture of the balance with the substances on it.

11. Block #1 and Block #2 are both made of aluminum, but the volume of Block #1 is twice the volume of Block #2. Which has the greater density? Explain.

12. Substance A and Substance B have the same volume, but the mass of B is half that of A. Which has the greater density?

13. Draw a picture showing how the following substances layer when put in the same container? Their densities are in parentheses.

• corn syrup (1.5 g/cm3),

• water (1.0 g/cm3),

• mercury (13.5 g/cm3)

• iron (7.87 g/cm3)

14. How does a graph of mass vs. volume help you determine the density of a substance? How does the graph help you compare the densities of different substances?

15. Draw a picture of a block of copper and a block of wax with the same volume showing the matter particles inside each.

16. Which would have more mass: a cube of wax with a volume of 4 cm3 or a cube of copper with a volume of 4 cm3? Explain your answer and show any math you used.

17. Which would have more volume: a cube of wax with a mass of 5 grams or a cube of copper with a mass of 5 grams? Explain your answer and show any math you used.

18. Graph the following data and calculate the slope of the line. What is the density of the material?

|Mass (g) |Volume (cm3) |

|11 |4 |

|19 |7 |

|27 |10 |

|38 |14 |

| |

|Corn syrup |

|Mercury |

1. The slope of the line on a mass vs. volume graph gives you the density of the substance. You can compare the densities of different substances by comparing their slopes: A steeper line means a higher slope and therefore a greater density. A flatter line means a lower slope and a lower density.

2.

Copper Wax

16. Since the copper is more dense, it would have more matter per cm3, so the copper would have more mass.

D (copper) = 8.9 g/cm3 m = D x V = 8.9 x 4 = 106.8 g

D (wax) = 0.9 g/cm3 m = D x V = 0.9 x 4 = 3.6 g

17. Since wax is less dense, the matter would be more spread out and take up more space, so the wax would have greater volume.

V = m/D Wax: V = 5/0.9 = 5.55 cm3

Copper: V = 5/8.9 = 0.56 cm3

18. Slope = (y2-y1)/(x2-x1) = (38 -11) / (14-4) = 27/10 = 2.7 g/cm3

-----------------------

iron

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download