We are learning to experiment with changing different variables.
Original
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Materials:
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Method:
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-milk
-food
colouring
-shallow
dishes
-detergent
-eye-droppers
or straws
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1. Pour milk
into a dish to a depth of about 1 centimetre.
2. Using an
eye-dropper or straw, add a few drops of food colouring to the milk in
different places.
3. Using a
separate eye-dropper or straw, add a drop of detergent to the middle of the
milk.
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Today we followed the above experiment then made changes. We
did the same experiment but with different types of milk. We all took turns and
were all a part of the experiments. Each group created a recording chart on the
computers to help them to make observational notes. We also timed how long each
reaction lasted for.
We were puzzled by why different types of milk made different
effects when mixed with dishwashing liquid and food colouring. We made
comparisons and needed to answer these questions: 1. How did the results
change? 2. What might the various results relate to?
Here are some of our thoughts so far:
Grace, Tommy, Aaliyah: The yellow top milk was very fast to
react. The green top was the only one that had bubbles in it that went around
the bowl and swirled around together. The amount of fat in full fat milk and cream
caused the reaction to take time and the colours did not fully mix.
Emma, Azi, Fritha, Willow: The fat content in the different
types of milk made changes in the speed of the chemical reaction. For example
cream had 32grams of total fat per 100g in it which made it very slow with less
of a reaction. The mix of the colours when experimenting with the fattest milk
types were not as combined and in some the main colour stayed white.
Anna and Regan: The results changed by the fact that the
higher the fat level, the slower everything moved. Also, the fatter the milk
was, the longer it took to complete the full chemical reaction.
Zoe and Heather: The different milks all had their own
reactions. Most of them started out very fast, then swirled and slowed down at
the end. There was quite a range in time difference, from 1 minute and 5
seconds to 1minute and 45 seconds.
Blog post written by Danielle and Miss Campbell