Package 3 - Year 1 & 2 Science - Liquid nitrogen show

Join the scientists from Fizzics Education as they teach you molecules and materials in their Liquid nitrogen show. Watch the video and then complete some of your own experiments at home.

Week 5 - Package 3 - Year 1 & 2 Science - Liquid nitrogen show

Things your child will need

Have these things available so that your child can complete this task.

Ideal

· Liquid Nitrogen Show video

· Cornflour (maize based)

· Water

· One bowl

· One tablespoon

· Food coloring (optional)

Optional: extension activity

· Plain or self-raising flour

· A second bowl and spoon (or you can wash the one used previously)

· Flower petals or leaves from the garden (just for fun!)

· Paper

Before your child starts

Make sure your child has everything ready that they will need at the start of the lesson. Set up the materials outside, or somewhere that mess is allowed.

What your child needs to do

1. Watch the Liquid Nitrogen Show video.

2. Discuss that materials can be changed in different ways. This might include changing temperature (like with liquid nitrogen) or by mixing with something else.

3. Discuss that when we change materials they might then be used for new or different purposes. For example, water is great for drinking, but when mixed with dirt, it is no longer good to drink and is much better for making muddy messes. Making mess is a new purpose for a new material made by mixing two other materials together.

4. Follow instructions on Activity Sheet 1 (below): Cornflour slime.

5. Discuss the results of the activity. What problems did you have (if any)? Did your slime get harder or softer when you poked it? What about if you put your finger in very slowly? What if you tried putting it out in the sun? Why do you think that happened?

What your child can do next

Looking for more fun things to investigate? Follow the instructions on Activity Sheet 2 Extension: Another kind of Flower (below).

Try researching non-Newtonian fluids and oobleck. There’s lots of cool information out there and the explanations may surprise you!

Options for your child

Activity too hard?

Find a material around the kitchen that is already kind of slimy. You might like to use yogurt, custard or even honey! Use a finger or a spoon to move the material around. Is it as runny as something like water? Is it as hard and dry as something like weetbix? Lots of things can feel like slime, it basically means it is not quite a liquid and is not quite a solid. It is something in between.

Activity too easy?

If you got your slime to just the perfect mix so that it was runny when you didn’t touch it, but hard when you poked it, well done! It can be tricky. But what if we ruined it on purpose? What would happen if you added more water? Does it still go hard when you poke it? Why?

Extension/Additional activity

Try out Extension Activity: Another Kind of Flower.

Meet the Fizzics Education team.

Activity sheet 1: Cornflour Slime

This material is also known as Oobleck or a “non-Newtonian fluid”. This means that it doesn’t behave like a normal fluid. Instead, its properties change when you put it under pressure (poke it or squish it) or when we leave it or play with it very slowly and gently. Be careful when making it. Too much or too little water and it will either be too runny or too dry. Try adding just a small amount at a time and mixing it carefully and all the way through the flour.

Equipment

· ½ cup of cornflour (maize) and some extra just in case you need to fix it

· 1 cup of water

· Food colouring (optional)

· A bowl

· A tablespoon

Procedure

1. If choosing to use food colouring, add a few drops into the water and stir

2. Put cornflour into the bowl (leave plenty of room to allow for mixing without a spill)

3. Using a spoon, slowly add a small amount of the water (coloured or clear) onto the flour and mix with your hands.

4. If the slime is still too dry, slowly add small amounts of water and mix. It should become a lovely goopy slime. Make sure to mix thoroughly.

5. If your slime is too runny, like water, add a little more cornflour to the bowl and mix with your hands.

6. Your slime is ready when you poke it hard and fast and it feels like a solid, but when you poke it slowly and gently it feels like liquid and sticks to your finger.

7. Pick up some of your slime and squeeze it in your hand and then let go, you should see it go hard and then slime down out of your hand again.

Discussion

Our non-Newtonian fluid slime has microscopic solid particles hanging in the liquid. We call this a suspension. This happens with cornflour and when we poke it it causes friction between these particles and they grip together to make a solid.


Extension Activity: Another kind of Flower/Flour

Think about the flour section at the supermarket. There are heaps of different kinds! The different kinds of flour can make a big difference in what it is used for in cooking and baking. They might seem pretty similar but if you use the wrong one it can be a cooking disaster. Does regular flour become the same kind of slime as cornflour? We know they are used for very different purposes in cooking. So let's find out!

Equipment

· Plain or self-raising flour

· Water

· A second bowl and spoon (or you can wash the one used previously)

· Flower petals or leaves from the garden (just for fun!)

· Paper

Procedure

1. Follow the same steps as for Activity Sheet 1, only this time use plain flour or self-raising flour instead of cornflour.

2. Once it is a “slime” try poking it, hard and fast or slowly as you did last time. Is it doing the same thing? Or is it always a slime? Or is it something else new that is not even a slime? Do you think you haven’t made it correctly or is there something else going on?

3. Hint! Try dipping some petals or leaves into it and then putting them on paper. That might help you to figure out what you have made!

Discussion

Would you use these kinds of flour for the same thing in the kitchen? Research what these two flours are usually used for and find out why they might make very different slimes. Here is a hint, this time you have made a paste not a suspension. Do you remember what we learnt about suspensions in Activity 1?

What happens to the flower petals or leaves that you put into the second “slime”? Try putting the petals or leaves on paper and waiting for the slime to dry.

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