Density Questions



Density Practice Questions Name:

Write the formulas below: Date:

Density= Mass= Volume=

Table of Densities (g/cm3)

Solids (20o) Liquids (20o) Gases (0o)

platinum 21.4 mercury 13.6 carbon dioxide 0.00198

gold 19.3 maple syrup 1.3 oxygen 0.00143

lead 11.3 glycerin 1.26 air 0.00129

silver 10.5 sea water 1.03 nitrogen 0.00125

copper 8.9 water 1.00 hydrogen 0.000089

iron 7.9 olive oil 0.92 helium 0.00017

aluminum 2.7 alcohol 0.79

quartz 2.65 gasoline 0.69

glass 2.6

human body 1.07

ice (0oC) 0.92

wood (oak) 0.75

wood (balsa) 0.16

On a separate piece of paper, use the GUESS method to solve the problems below.

1) What is the mass of:

a) 1.0 cm3 of glass?

b) 1.0 cm3 of air?

c) 2.0 cm3 of gold?

d) 10 cm3 of lead?

e) 100 cm3 of maple syrup?

f) 1000 cm3 of helium?

2) Gold has a density of 19300kg/m3. Find the mass of a piece of gold with a volume of 7m3.

3) If you have a mineral sample with a volume of 40 ml and a mass of 200g, what is the density?

4) Iron has a density of 7.9g/cm3. If an iron nail has a mass of 1.2g, what is its volume?

5) Nickel has a density of 8900 kg/m³. Find the volume occupied by 31000 kg nickel.

6) You find a piece of unknown metal in the lab. You measure its mass and find it to be 6.2g. You measure its volume and find it to be 0.55cm3. What type of metal is it?

7) A prospector finds a piece of metal which has a mass of 100g and a volume of 10cm3. Is the metal gold?

8) A piece of nickel has a mass of 130g and a density of 8.9g/cm3. A piece of magnesium has a mass of 60g and a density of 1.6g/cm3. Which piece of metal will have the larger volume?

9) Ethyl alcohol has a density of 0.8g/mL. Would a 100mL graduated cylinder hold 120g of ethyl alcohol?

10) The case of the missing crown: Imagine that you are living in Europe in the Middle Ages. You have been summoned by the King of your land to help in a very important matter. Someone has stolen the King’s solid gold crown. The King has issued a proclamation offering a reward of 500 gold coins for the safe return of his crown. The problem is that the King has received hundreds of crowns – and they all look exactly like the missing crown! Your job as a brilliant scientist is to find out which crown is the real one. The chart below shows some data that you have collected on one batch of crowns. Study the data and then answer the following questions.

|Crown # |Volume (cm3) |Mass (g) |Density (g/cm3) |

|1 |180 |1890 | |

|2 |180 |486 | |

|3 |180 |1404 | |

|4 |180 |3474 | |

|5 |180 |2034 | |

a) In the space provided to the right of the data above, calculate the densities of the 5 crowns.

b) Based on your calculations, do you think that any of these crowns could be the real one? Why or why not?

c) Which of these crowns do you think are fakes? Why?

11) Which has a greater mass, one litre of gasoline or one litre of maple syrup? Explain how you know.

12) Which has a greater volume, one kilogram of gold or one kilogram of glass? Explain how you know.

13) You have a piece of unknown metal that measures 1.0cm x 2.0cm by 2.4 cm. Its mass is 50 g.

a) What is the density of the piece of metal?

b) What is the identity of the metal?

14) If you had a 10 g piece of each of the substances below, then which substance would have the smallest volume? Explain how you know.

balsa wood, glass, oak wood, quartz, aluminum

Answers

1. a)2.6g b) 0.00129g c) 38.6g d) 113g e)130g f) 0.17g

2. 135100kg 3. 5g/mL 4. 0.15cm3 5. 3.5 m3 6. Lead 11.3g/cm3 7. Not gold 10g/cm3

8. Magnesium has the larger volume 9. No 150mL will not fit

10. a) Crown 1) 10.5 g/cm3 2) 2.7 g/cm3 3)7.8 g/cm3 4)19.3 g/cm3 5) 11.3 g/cm3

10. b) Crown # 4 could be the real one because it has the same density as real gold.

10. c) Crowns 1, 2, 3 and 5 are probably fakes because they don’t have the density of gold.

11. Maple syrup is denser so it will have a greater mass. 12. Glass is less dense so it will take up a larger volume. 13. a) 10.4g/cm3 b) It is probably silver (close enough to 10.5 g/cm3)

14. Aluminum because it is the most dense

Homework:

Be sure to be ready for next class by completing the pre-lab for the density lab:

purpose, materials, procedure, observation table

Also, if you need more help to understand density calculations, see Mrs. Renkema Thursday at lunch.

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