====== 5. Up, Down & Around (Temperature) ======
Vibrating (jiggling) molecules can move up, down and around

The purpose of [[http://www.coffeecupsandcrayons.com/simple-heat-experiment/|this simple experiment]] is for students to determine the relationship between temperature and speed of molecules in a liquid.

QUESTION
  * How could we design an experiment to find an answer to the above problem?

EXPERIMENT
  * If nobody can come up with a better solution, here is one experiment to try...

PROBLEM QUESTIONS:
  - what is a molecule?
  - how do molecules move?
  - does heat affect the way molecules move?
  - how could we find out if heat affects the way things move?
  - do you think that heat changes the temperature of the molecules themselves?

Students will use water & food dye to discover more about 'jiggling' and heat: [[http://www.coffeecupsandcrayons.com/simple-heat-experiment/|Source]] 

Think about what you are going to do, then write down a prediction about how you think the temperature of water might make a difference when food dye is dropped into the water

Materials you’ll need:
  * 3 clear jars
  * water: cold, room-temperature, hot water - 1 jar full of each
  * concentrated food colouring
  * masking tape
  * markers
  * thermometer (digital thermometer is best, but even no thermometer is OK)

Method to conduct the experiment:
  * Label the outside of each jar with the water temperatures you are going to use.
  * Fill three bottles. One bottle for room temperature water (about 25C), one with hot water (about 60C), and one with cold water with ice cubes added (about 10C).
  * Add a drop (same amount) of food colouring to each of the jars
  * Observe what happens over time and write down your results

Perform your experiment, then write down your results in a table similar to this:

^Question ^Results (write down what you found) ^
^Which of the three jars holds the warmest water |   |
^Which of the three jars holds the coldest water |   |
^Which of the three jars spreads the food colour fastest |   |
^Which of the three jars spreads the food colour slowest |   |

Discuss the results that you wrote into your table.

Using your results, discuss the result that you observed and what they might show about heat.

Can you use your own/other evidence to help convince the class that molecules move slower/same/faster when they are warmer, slower/same/faster when they are colder, or move the same amount 
when warmer as they do when cooler.

=== Video: WPS 3/4S Investigate Moving Molecules (1min) ===
{{ youtube>fhZCwyVgCs4?640x360 |WPS 3/4S Investigate Moving Molecules}}
  * IF UNABLE TO ACCESS YOUTUBE VIDEO, TRY:[[http://viewpure.com/fhZCwyVgCs4|Viewpure]]

  * How could this experiment be improved if someone wanted to run a similar test?

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