Category Archives: Science

Personal hygiene experiment

Year 5 have completed their topic on personal hygiene by carrying out an experiment to see where in school the most germs are.

They made their predictions and today the results of the experiment were uncovered.

They were as follows…

The control potato showed no mould at all due to it being untouched by human hands. The potato that was wiped in the flower bed had no mould either, as it was protected by the nutrients in the soil.

The potato wiped on a child’s hands contained quite a lot of germs but the potato with the most germs, was the one that was wiped on the sink.

The children loved the experiment and are now well aware of the importance of washing hands and keeping work areas clean.

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!