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Dancing Raisins Investigation

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Dancing Raisins Investigation

Sione, Tevita and Ruben are testing what makes raisins rise and fall in fizzy water. Work safely: do not taste the liquids, use a tray, and ask an adult to help pour. Keep the glass, liquid amount and raisins the same when comparing results.

Plan the investigation

1.The weather station team wants to find out whether the type of liquid affects how often raisins rise. Which question could they investigate?

How does the type of liquid affect the raisins’ movement?
Which raisin tastes sweetest?
How many glasses fit on the tray?
What colour is the weather station?

2.Sione will test still water, fizzy water and lemonade. Name the variable he changes on purpose.

3.Give two things Tevita should keep the same in every glass to make the comparison fair.

4.Ruben predicts that raisins will move most in fizzy water. Complete the prediction with a reason: “I think the raisins will move most in fizzy water because…”

Observe and record

Pour the same amount of each liquid into identical clear glasses. Add the same number of raisins to each. Watch for two minutes. Record what happens; repeat a test if you can.

Liquid

What did the raisins do?

Number of rises in 2 minutes

Still water

Fizzy water

Lemonade

5.After observing, name one thing you measured or counted to compare the liquids.

6.True or false: If you use twice as many raisins in the fizzy water as in the still water, the test is still a fair comparison.

TrueFalse

Explain the raisin dance

7.Draw a simple glass with a raisin rising. Add arrows and label the bubbles, the raisin and the direction it moves.

8.Bubbles of gas can stick to a raisin. What might happen to the raisin as the bubbles lift it towards the surface?

9.Suppose the raisins rose 0 times in still water, 5 times in fizzy water and 3 times in lemonade. Which liquid caused the most rises, and what evidence supports your answer?

10.The team gets different results when they repeat the test. Give one useful next step before deciding what the results mean.

11.Complete the reflection: “One observation I made was… This makes me wonder…”