Category Archives: Science

Crocodile egg experiment

On Friday, year 5 took part in an experiment looking into the effectiveness of Hydrogels. We submerged a crocodile egg in water and we”re going to measure it every day for a week to see just how much water the crocodile will absorb before it stops growing completely.

Some of the children have predicted a giant crocodile will emerge… Let’s hope not!

Removing nail polish experiment

Year 5 have had a fabulous afternoon testing which solvents are most effective at removing nail polish. They tested a range of chemicals such as hydrochloric acid and ethanol. They had to be very sensible and use the correct equipment carefully. Working together, they recorded their results in a table and discussed their findings. It was interesting to see whether their findings supported their predictions.

Swinging pendulums.

This afternoon in Science, the children created swinging pendulums. We were investigating whether the pendulum having a longer or shorter string would affect the number times it would swing in a certain amount of time. We found out that the pendulums with longer string could swing a greater number of times, but the pendulums with the shorter string could complete swings quicker.

Video: Learning about kinetic energy

In Science, Year 5 have started their new topic, energy. Today we had a quick lesson looking at springy toys. We discussed what happens when you a springy toy and why this happens. We learnt that when the toy is pressed down the strain creates elastic potential energy. Then when the rubber plates separate and the toy flies into the air the kinetic energy has been created and released.

I think the children enjoyed playing with the toys the most… take a look at some of the pictures below.

Video: Chemical reactions

Year 5 Kestrels have looked at more chemical reactions. We watched clear water turn blue when methylene blue was added to it.

As we were watching it, it began to become clear again!

Then Miss Edwards shook the bottle and it turned blue again!

That was amazing to see.

Then Miss Edwards kept the bottle still and we observed the liquid return to clear.

Watch the video and see for yourself.

The children observed and decided that the methylene blue was absorbed into the clear liquid or it dissolved.

They also decided that it was a reversible reaction and that is why it returned to clear (once it was not shaken any more).

This happened because oxygen was introduced into the solution (when shaken) and this made it turn blue again.

‘Soda Snake Firework’

Today in science year 5 were watching a demonstration called ‘Soda Snake Firework’.

A glass bowl was filled with sand and topped with some baking soda and icing sugar mixed together. Then a bit of Propan-2-ol was drizzled on top of the mixture. After setting it alight the mixture started to caramelise and eventually what looked like a black snake emerged from the bowl.

It did take a few attempts for us to get it right, but we got there in the end!

Milk with detergent investigation

This afternoon in science Year 5 have been investigating what happens to milk when detergent is added to it.

We started off with a bowl of milk with a few drops of different food colouring scattered around. Then we dipped a cocktail stick into some detergent before sticking it in the centre of our milk. The colours all merged today and swirled around the bowl. It was pretty amazing to watch!

Calcium carbide investigation

Year 5 Kestrels continued their investigations on chemical changes this afternoon.

They reviewed yesterday’s experiment and discussed how alcohol makes paper burn easily but water stops paper from burning.

Today they investigated how some changes result in the formation of a new material.

Calcium carbide was added to water. We could see that there was a production of bubbles, smoke, fizzing and then when it was lit there was a pop and a huge flame.

Tiny particles of carbon cake floating down from above us too.

Chemical changes

This afternoon Year 5 Kestrels were looking st chemical changes again.

They looked at three beakers with clear liquids in them.

When a piece of paper was immersed in the water it was set alight. The class observed what happened.

With beaker A

Nothing happened…

With Beaker B…

The paper caught fire quickly.

With Beaker C….

There was a flame, which went out after a few seconds, but the paper did not burn.

Lots of the class thought there was water in the beakers but there were other ideas: gasoline, acid and contact lense solution…

They found out that there was water in the first beaker, water and ethanol in the second beaker and a mix of water and ethanol, with some salt, in the third beaker.

Solutions changed what happened to how the paper burnt…

They will Investigate further.