We are very proud to introduce our Young Science Ambassadors!
Saskia, Charlotte, Freya, Leah, Megan and Helena are on a mission to encourage the rest of the school to love Science as much as they do.
Every Monday lunchtime they are going to be taking part in Science Club with Mrs Matthews where they will be increasing their scientific knowledge through experiments, exploration and hands-on fun!
This week our Young Science Ambassadors created their own lava lamps. Follow the instructions below to make one of your own:
You will need:
1. Pour the water into the jam jar/bottle until it is approximately one third full.
2. Add the oil. You may have to wait a few minutes for the oil and water to separate.
3. Add a few drops of food colouring. The drops will pass through the oil and then mix with the water below.
4. Drop the tablet into the bottle. Watch it sink to the bottom and the lava lamp begin to work!
At first the oil separates and sits above the water because it is less dense. When you add the fizzy tablet, it sinks down to the bottom and starts dissolving and creating a gas. As the gas bubbles rise, they take some of the coloured water with them. When the blob of water reaches the top, the gas escapes and down goes the water!
You could try to answer these questions:
Today we were interested in finding the answer to the question: Will lemons always float in water?
First, we put whole lemons in water and could see that they floated.
We then decided to chop the lemon into smaller pieces to see if they would still float- they bobbed happily on the surface!
We then carefully took the rind of the lemons off and popped them back into the water…and they sunk.
We discussed how when we took off the rind, we were removing the lemon’s life jacket because the rind is full of thousands of tiny air bubbles. When you take them away the flesh that’s left behind is heavier than water.
Why not try investigating this at home with limes? Let us know what you discover.
Can we make a paper clip float? That was today’s challenge in Science Club. We first tried this by putting a paper clip in a bowl filled with water and, as we expected, it sunk. We then got a piece of tissue paper and gently dropped that onto the surface of the water. Very carefully, we put the paper clip onto the tissue. Using a pencil with a rubber on the end, we carefully poked the tissue ( not the paper clip) until the tissue sunk, but the paper clip floated!
How was this possible?
This works because of something that us scientists call surface tension. It means that there is a sort of skin on the surface of the water where the water molecules hold on tight together. If the conditions are right, they can hold tight enough to support the paper clip.
We thought about other questions that we could try to answer if we were to carry out this investigation again:
Today we explored the effects of carbon dioxide. We did this by adding sultanas to both a glass of tap water and a glass of fizzy water (with a few drops of food colouring in the fizzy water so that we could distinguish between the two glasses). When they were put into the tap water, the sultanas sank to the bottom. However, when they were added to the fizzy water, they floated to the surface and then sank to the bottom- just like they were dancing!
We discussed why this was happening and how fizzy water contains a large amount of dissolved carbon dioxide. The carbon dioxide bubbles are less dense than the fizzy water, so they rise to the surface. The sultanas initially sink to the bottom as they are heavier than water, but as the bubbles start to rise to the surface, they attach themselves to the sultanas, causing them to rise too. Once the sultanas reach the surface, the bubbles supporting them pop, causing them to sink again. But they rise again as new bubbles lift them up.
Have a go at home and let us know what you find out.
You could also try different types of fizzy drinks or maybe experiment with other objects to see if you can make them dance as well!
Read on for our method of how to make water walk!
We got very messy today making our own oozy slime. We did this by using cornflour, water and food colouring. We added water to the cornflour and food colouring slowly until we had a very thick creamy mixture which felt like a stiff liquid when we were mixing it with our hands. We were amazed at how it felt a bit like rubber when we had finished mixing it, but when we squeezed it between our hands it changed so it felt soft, similar to plasticine. Almost immediately after we stopped rolling and squeezing it it flowed out of our hands like a runny, messy, oozy slime!
We investigated the science behind our slime and found out that when you mix cornflour and water together it forms what’s called a suspension or colloid: Tiny, solid particles (of cornflour) suspended in a liquid (water).
Today our Young Science Ambassadors led an assembly in which children from Years 1-6 took the opportunity to celebrate the exciting Science that classes have undertaken this term. It was a real pleasure to see the children sharing their learning in:
Today we had fun carrying out an experiment where we transformed old dull-looking pennies into pennies that became bright and shiny! We did this by putting the penny into a bowl of tomato ketchup (making sure it was completely covered) and leaving it for three minutes. We then had fun getting messy fingers by rubbing the sauce into the coins for another thirty seconds. The next step was to use water to rinse and clean all of the ketchup from the penny.
Finally, we dried the penny with a tissue. The results were amazing! Instead of dull-looking coins, we had money that was so shiny we could almost see our reflection in them! We learnt that the salt plus the acid in the tomato sauce formed hydrochloric acid and this reacted with the copper.
Why not try this at home?