Today Robins watched what a volcanic eruption would be like… well we tried!
Using Ammonium Dichromate we tried to simulate a volcanic eruption.
By heating the bottom of the conical flask we simulated the heat built up inside a volcano. Usually when the Ammonium heats it flares giving a green gas as it ignites. The green gas is nitrogen and can be smelly, but we had glass wool plugging the top of the flask.
We did see some sparks and the chemical reaction did create a lot of smoke in the flask. Unfortunately because the Ammonium did not stay as one lump (it spread out a bit too thinly) it did not create a hugely exciting reaction.
Hopefully the next class to do it will get a better result and we can watch their attempt!
The chemical reaction left the Ammonium Dichromate as charred ash, just as you would see in a volcanic eruption.
We learnt that not all experiments will work first time, and that it is important to watch carefully as some chemical reactions are super fast. We did enjoy it though. It was a little bit like watching miniature fireworks in the flask! Another exciting science lesson in Robins class!
This afternoon Robins put on their safety goggles and gloves to complete an investigation.
They were investigating which solvents were the most effective at removing nail varnish.
They had the following solvents:
Before the investigation, they predicted which one they thought would be th most effective. Which one would you have chosen?
Each pair were given a tile and the painted 5 lines of nail varnish on them.
Then with a cotton bud dipped into one of the solvents, they tried to remove the varnish.
They then recorded their results. Have a look at what they found.
We have named our crocodile Mr Snapalots. Today we found that the egg had hatched even more and he was beginning to escape it. We took him out of the water and measured his length. He is already 12cm long.
They use an airzookla, which is a gadget that shoots out puffs of air. Miss Edwards shot out puffs to knock down cups off the table.
When she pulled back the tab on the airzookla, it sucked in some air and as she released the tab, it shot the air out!
To show it better, we used a smoke machine….
We could then easily see how the airzookla created kinetic energy which made the smoke travel. It then began to lose kinetic energy as it travelled through air. The smoke began to dissolve as it travelled because it mixed with air particles.
Year 4 have continued their science learning and have been investigating the solubility of salt and sugar.
The children worked in pairs to put salt and sugar into cold water and see which dissolved the quickest.
The children ended up having a real mixture of results therefore we discussed the reliability of the experiment. The children discussed how it wasn’t really a fair test because you could have accidentally put more sugar in the water than salt.
Year 4 have learnt that science doesn’t always go to plan but that’s part of the fun!