Thursday, 10 September 2015

DANCING RAISINS...

Room 3 are continuing to make scientific observations.

I SEE     I THINK     I WONDER

We have been discussing how scientists observe :  using our senses, looking carefully, listening, smelling, tasting and touching.

On Tuesday we started with a handful of raisins in a cup of water - we noticed the raisins sunk to the bottom of the cup.  We noticed there were some tiny bubbles of air around the raisins.
We then repeated the experiment but this time with soda water..
Observe ..Observe.. Observe..
The raisins began to rise and sink, and also jiggle around on the bottom ..dancing.  We saw lots of bubbles surrounding the raisins
What was happening and why was it happening?


video




Discussion:
1. What do you think will happen to the raisins when the water runs out                 of carbonation?  

2.  Why do you think the fizz tastes flat after it has been out for a while?

3.  What is carbonation?  How can you tell it is in the liquid?. 

4.  Define Density:  Density is the amount of mass per unit of volume.

5. Which is denser: raisins or the liquid? How can you tell?  
    The raisins are denser than the soda pop because they sink.


6. What happened to the raisins? Why?


WHERE TO NEXT?
What would happen if we used different objects eg. apple seeds, chick peas, pumpkin seed..
What would happen if we used different carbonated liquids  - is coke more carbonated, what about baking soda and vinegar?
How long would the soda water 'push' raisins up and down?
Does the temperature of the liquid make a difference?


Room 3 Students are now designing a fair science test to test the ideas above ... stay tuned to check out what happens next.

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