Category Archives: Science

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.

Video: Hair gel experiment

Today in Science, Year 5 Kestrels investigated what would happen to hair gel if they sprinkled salt (sodium chloride) onto it.

We started by making our predictions:
I think it will turn into slime – Callum
I think it might change colour – Lexie
I think it might make a little ‘boom’ and then turn into slime – Jake

Then it was time to get sprinkling! We found that the salt dissolved and the gel turns into a liquid. It also changed colour slightly into a cloudy, baby blue.

Investigating nappies experiment

This afternoon Year 5 Kestrels investigated nappies!

They looked at what happened when liquid was added to the grains in a nappy.

Some of the predictions…

The children then cut open a nappy, took out the tiny grains and collected them in a bowl. Once the grains were sieved to remove any cotton wool the children noted how much they had left.

They then added water to the grains, 10ml at a time, and recorded their findings.

They could see that each time they added water the grains got bigger and bigger, but remained dry.

Finally, they added salt and observed the grains. The grains became wet!

Video: Chemical reaction

This afternoon Year 5 investigated fire!

We watched a clip from Harry Potter and the goblet of fire. We saw a green fire.

We wondered if it was possible….

Then Miss Edwards demonstrated a chemical reaction of methanol with Boric acid being lit.

It was amazing to see the flames in a beautiful green colour.

We thought about why it happened and what we learnt.

“I used to think that you needed to use food colouring and now I think it was an acid that made green fire because of the chemical reaction between methanol and Boric acid when it is lit with a flame.”

Video: Presenting our findings

Year 5 continued their research on famous chemists this afternoon. It was a great chance to make sure they had all the details sorted, ready to present their findings. Some of the scientific words were baffling at first so using a dictionary effectively and efficiently was important.

The children went on to present some of their finding. Our presenting skills are getting better and better.

Famous chemists

Today Year 5 were heavily researching some famous chemists. There have been a number of people around the world who have contributed greatly to the world of science. The children spent part of the afternoon finding facts about their chosen person.

There were 4 to chose from:
• Marie Curie
• Jabir Ibn Hayyan
• Linus Pauling
• Fritz Haber

There were some wonderful facts found and the children learnt about some weird and wonderful scientific discoveries:
• Synthetic fertilisers
• Cures
• Advances used in technology even today, like chemicals used in fluorescent paint!

Well done Year 5, looking forward to what comes next.