Comparing Density



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Comparing Density
Water in the metric system was selected to have a density of 1.0 g/ml. This means that one milliliter of water has a mass of one gram. Any substance having a density less than 1.0 g/ml will float on water. Any substance having a density greater than 1.0 g/ml will sink in water.
1. Study the Density Table.

a. Name five substances that will float on water. ________________, _______________,

_______________, _______________, ______________


  1. Name five substances that will sink in water. ________________, _______________,

_______________, _______________, ______________



  1. What is the least dense substance on the table? _________________




  1. What is the most dense substance on the table? _________________




  1. Mercury is a liquid with a density of 13.6 g/ml. Which metal on the table would sink in mercury? _______________________________




  1. Gasoline has a density of 0.7 g/ml. Would you expect it to sink or float on water? Why? __________________________________________________




  1. You find a lump of what looks like gold. Based on what you learned so far about density, how could you find out if it is really gold? ___________________________________________________________________

___________________________________________________________________

DENSITY TABLE (g/mL)

SOLIDS METALS LIQUIDS

Bone 2 Aluminum 2.7 Pure Water 1.0

Brick 1.8 Copper 8.9 Sea Water 1.03

Cork 0.2 Gold 19.3 Alcohol 0.8

Ice 0.92 Iron 7.8 Glycerine 1.3

Marble 2.7 Lead 11.3 Milk 1.03

Paraffin 0.9 Silver 10.5 Turpentine 0.9

Rubber 1.2 Mercury 13.6

Bamboo 0.3 Gasoline 0.7

Oak Wood 0.7

P

ine Wood 0.6


Answer the following questions. If it asks you to calculate density, SHOW YOUR WORK!!
1. Garlic breath is really very heavy. When a 450mL flask is filled to capacity the garlic breath has a

mass of 286g. How dense is garlic breath?

2. You are given two clear, colorless liquids. You measure the densities of these liquids to see

whether they are the same substance.



  1. What would you conclude about the liquids if you found the densities to be 0.93 g/cm3 and 0.79 g/cm3? Why?



  1. What would you conclude if you found the density of each liquid to be 0.81 g/cm3? Why?

3. How dense would 3,000L of water be?

4. How dense would a 2cm x 3cm x 10cm block of wood be if it had a mass of 56.9g?

5. If the same block above were cut in half, what would be the density of each half? Explain.


6. A 2L (2,000mL) bottle has a mass of 234g when empty and a mass of 2367g when full. How

dense is the pop?


7. An ant can only lift about 4g. Would it be able to lift a piece of Styrofoam which measured 3cm x

3cm x 3cm if the density of Styrofoam is 0.24g/cm3? What is the mass of the Styrofoam?


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