Tag Archives: compounds

Elephant’s toothpaste in the main building

February 27, 2016 Ailie Rankin 1 Comment

After the excitement about the erruptions, explosions and gaseous experiences, I thought it only appropriate to revisit elephant’s toothpaste but this time with the main building children.

We used the same ingredients as last time.

Hydrogen peroxide, yeast, fairy liquid, washing up liquid, dye.

The same safety rules applied..

“No touching the bottles!” – Gabi

However, this time we added a little more of a hands on approach with the children using the droppers to add the yeast. This allows the children a level of responsibility (managing their own, all be it small, risk) which adds a level of engagement and greater involvement in the learning.

We used droppers, a beaker for the yeast mixture and a spoon for measuring and stirring.

There were a number of predictions in which the children applied knowledge gained from previous experiences….

"I predict that its going to right up to the roof and down!" — “I predict that its going to right up to the roof and down!”

“It’s going to besplode!!” – Heidi

"Its gonna overflow!" — “Its gonna overflow!”

Lara even used the correct vocabulary when making her prediction!!

“I predict it’ll go right up to the roof and back down” – Lara

But first we had to mix the yeast. This offered opportunity for the children to engage with real measure (of a spoonful) and counting the spoonfuls to add. They also had to take turns to mix the yeast as I deliberately only offered one spoon and one beaker.

Eilidh and Lily carefully measured out teaspoons of yeast powder into the beaker in preparation for mixing it to activate it.

We took turns to mix the yeast mixture. Ross and Isla revisited the experiment in the afternoon.

Lara, Olivia and Gabriel took turns to mix the yeast and water together to activate the yeast.

“Eeeuurgh it smells like a swamp or a dirty shoe!” – Ryan D.

Then we had to use those important hand muscles to squeeze the washing up liquid to the hydrogen peroxide that I had already poured into bottles.

We had to use our hand and finger muscles to squeeze the washing up liquid into our mixture.

We used washing up liquid to allow the gas to create bubbles and foam.

And so we were ready to add the yeast…

We used the droppers to add the yeast mixture safely.

Bramble focused and concentrated to squeeze all the yeast into the hydrogen peroxide quickly.

Caoimhe carefully added the yeast with the dropper.

And the results were quite good.

“Ross’s stayed the same but mine BESPLODED!!” – Heidi

"It was really really really foamy!" — “It was really really really foamy!”

We observed the experiment to monitor what happened.

The foam kept growing and growing. “It looks like a big ice cream!” – Patrick

Jude took a step back – unsure if it would explode!

Eilidh and and Lily explored the the texture of the foam with their hands as Ross and Eve mixed the yeast for the next batch.

We watched as the mixture grew and grew!

The mixture grew fast in some cases. “Look at mine – its overflowing!” – Isla

So why did it explode? We analysed the experiment..

“It was because we put too much yeast in” – Heidi

"It exploded because it made gas." — “It exploded because it made gas.”

Ross reported and shared what had happened. His remembering and discussing the bubble shows that he was thinking about it.

"First there was the bottle, then it all overflowed!" — “First there was the bottle, then it all overflowed!” – Ryan

The foam that it created was warm and harmless as the yeast had mixed with the hydrogen peroxide, burning all the peroxide away and releasing heat and oxygen which mixed with the washing up liquid to create the foam. Some of the mixtures needed a little help to get going so I gave them a little shake to mix them up and that worked a treat.

And of course the harmless foam was lovely for making patterns and marks (early writing) and exploring the colour mixing (yet more science)!

An said “We have a new colour now! Rainbow colour!”

James spent a long time investigating how the foam would drop from his hand on to his arm. He wanted to see how much he could pile up.

So what next?

Well Ryan gave us an excellent question to explore..

“What does disolve mean?” – Ryan

But the mixing of the coloured foam revealed another area to explore as the children created new colours.

“Look what colours I can make!” – James

And then I discovered Brandon’s interest in Angry Birds and thought about how we could explore forces further with catapults and towers…….hmmm

But Holly made it clear what we should do on Monday..

“Aww Ailie, I never saw the science today. Can we do it again on Monday?” – Holly

Well how could I resist? And I just so happen to have bought a stronger concentration of peroxide – I wonder what difference that will make?

Why not help me decide what direction to take after Monday? I will of course ask the children but please add your ideas too! Is there an experiment or science area you would like us to explore? Let me know!

In the meantime why not try to recreate some of these chemical reactions at home? You can buy hydrogen peroxide at Sally’s in the town and the yeast is available in the baking section of Tesco. Antibacterial washing up liquid doesn’t work so well so just go for the original kind, bubble bath works also.

Good luck and happy experimenting!

chemistry

Learning from Einstein

February 19, 2016 Ailie Rankin Leave a comment

Einstein quote

I saw this as I was eating my breakfast this morning and thought how this totally sums up learning through play. And explains why today we revisited gas.

This morning we looked at gas with the more scientific frame of mind, attempting to create a gas by mixing a liquid and a powder. We caught and measured the gas in the balloons again.

As usual we made and recorded predictions, observations and our thinking about why it happened (training the mind to think!).

Only one person predicted their solution wouldn’t make a gas:

Natalie – “I predict no gas.”

Everyone else predicted lots of gas would be made.

Innes chose a tablet and vinegar and predicted "a big gas" — Innes chose a tablet and vinegar and predicted “a big gas”

Lucy chose to mix a tablet and bubble bath and predicted "a big bit of gas". — Lucy chose to mix a tablet and bubble bath and predicted “a big bit of gas”.

Pearce chose to mix a tablet and vinegar and predicted "lot's of gas". — Pearce chose to mix a tablet and vinegar and predicted “lot’s of gas”.

In fact Sophia and Olivia selected their ingredients based on their past experience with the science. When asked why they had selected bicarbonate of soda and vinegar,

Olivia replied: “Because it’s going to get bigger and explode!”

and Sophia said, “Because I want mine to get ginormous!”

So there were a variety of results depending on the combination chosen.

We had to wotk together to crush the tablets.

We squeezed the balloons to feel the gas.

Olivia pours her bicarbonate of soda from her balloon into the vinegar.

Gabriel was disappointed when his mixture of fizzy water and icing sugar made very little gas.

Patrick was able to set up his expeiment with very little help.

Ryan liked watching the bubbles fizz and make the gas.

Sophia’s mixture made a lot more gas than Isla’s

carbonated water and effervescent vitamin tablet.

“Oh my gosh Sophia! That is soooo big!” – Millie

The most interesting however was the bubble bath + effervescent tablet………

You could see the crushed tablet sink into the bubble bath.

The crushed tablet took a while to mix with the bubble bath so nothing happened for a while.

After a while it mixed and produced a little gas!

Gracie and Bramble were able to apply their previous science learning to their understanding of what had happened…

"We made a potion. It forced up lots and lots of gas and made the balloon bigger and bigger!" - Gracie — “We made a potion. It forced up lots and lots of gas and made the balloon bigger and bigger!” – Gracie

"The balloon goed bigger and bigger 'cause of the experiment gas!"- Bramble — “The balloon goed bigger and bigger ’cause of the experiment gas!”- Bramble

Smart cookies eh?!

For the afternoon session I took to heart another Einstein quote……

So we just freely “researched” compounds and mixtures.

We talked about what was happening and what we wished to add to our mixtures.

We had to use our hand and finger muscles to squeeze the ingredients out of the bottle – this helps us prepare to write!

And the phrases “Oh my gosh!” and “Look at mine!” were heard aplenty when the vinegar, bicarbonate of soda, effervescent tablets and carbonated water began to mix.

We used a huge amount of maths language as we were experimenting – “more” ,”less”, “after”, “next”,” first” ,”higher”, “heavier” ,”lighter” as well as hearning myself model more science vocabulary.

Did you know that the greater a child’s vocabulary before school, the more success they have in school? You can read research suggesting that here and here.

Also did you know that the average person produces gas 14 times a day? (Thought Patrick might like that wee fact!) Why not amuse your family with more fart facts?

I’m sure Einstein would have been very proud!

Don’t forget to share the learning that your child shares at home and leave comments to let me know what you think of the experiments and the blog – especially any ideas or suggestions – Thank you!

chemistry

balloons and gas

February 17, 2016 Ailie Rankin 4 Comments

Today we looked and at and thought about balloons and gas. This was a follow up to Isla’s fab question last time:

“What is gas?”

So we started with our balloon holding bicarbonate of soda on a bottle containing vinegar. We discussed what happened when we mixed these ingredients on Monday.

“The bottle fell over and it just fizzed a bit” – Alf

So the consensus of prediction was that the bottle would fall over.

The balloon inflated however, much to the children’s delight!

“Arrgh! It’s getting bigger! It’s going to explode!!” – Patrick

We squeezed and shook the balloon and bottle and thought about the bubbles (which were made by the gas) and we decided to investigate – could we make a gas?

“Yes!” – Daniel “It’ll be like a bomb and explode!” – Patrick

We had bicarbonate of soda, vinegar, effervescent tablets, carbonated water, bubble bath, conditioners, shaving foam, caster and icing sugars.

We discussed safety as usual:

“Wash hands after.” – Innes “Don’t pop the balloons!” – Alex

“Move if you think it’ll explode!” – Daniel

Again there was disagreement about how long it would take….

“25 hundred” – Daniel “Just a minute or 2” – Patrick

"It'll take THIS long" — “It’ll take THIS long”

We mixed various ingredients and had a variety of results:

“It grew bigger and bigger and exploded like a bomb! It was going EVERYWHERE!” “It was because of the gas” – Patrick

“Look at mine! It’s like lava but it’s not hot!”

In the afternoon I structured it so that we were much more scientifically looking at the gas first. The children could choose what to mix and predict if it would make a gas to inflate the balloon or not.

"It might melt our eyes!" — “It might melt our eyes!”

It fizzed and bubbled out from under the lid.

It was not good, not enough gas” – Finn

"I'm scared it'll blow up" — “I’m scared it’ll blow up”

“It was small”- Belle

“It looks like a rocket” – Isla C.

"It just made a little gas." — “It just made a little gas.”

Sophia gave us the quote of the day………

“I am OBSESSED with all this gas! It’s like a hundred billion! It’s amazing!” “How much gas are you making????”

Our star scientist award has to go to Fraser though. He was one of the first to join the experiment and nearly the last to leave at the end of the morning. He quickly realised which ingredients gave the best fizzy results and experimented with differing amounts in various containers. He really focused on developing his learning about chemical reaction and gas! Well done Fraser!

Why not have a go at some mad mixing at home to create gases and explosions? Any household and kitchen ingredients could combine to make an interesting and possibly smelly concoction! Our fizzy favourites have to be the vinegar+ bicarbonate of soda or the carbonated water + effervescent tablets + bubble bath. Let us know how you get on, share any cool pictures or results.

And remember you can find lots of science ideas on our pinterest page.

Happy experimenting!

Campus, chemistry

Elephant’s Toothpaste

January 29, 2016 Ailie Rankin Leave a comment

While working on the potions it became clear that erupting and exploding reactions were the ones that the children sought the most. After a quick browse on Pinterest we came across Elephant’s Toothpaste. How could we resist?

We used hydrogen peroxide as part of this experiment which is obviously nasty on the skin so some time was spent discussing ways of ensuring we were safe. This is always part of our process but was especially focussed on for this experiment.

We were careful to keep our hands away from the bottles –

“It’s dangerous! Don’t touch! But we can watch.”

The hydrogen peroxide was mixed with a little washing up liquid and food colouring, grown ups needed to do that bit. The experiment used yeast as well which we could touch and so help with that.

We watched closely as Ailie carefully poured the chemicals together.

Then we poured the mixtures together….

We had a range of different predictions. Alfie thought the yeast would turn green. Millie predicted it would go bubbly. Jack thought it would turn into water. Everyone else just thought the colour would change. However no-one predicted quite what happened.

“It Exploded!!” – Alfie

It foamed up and over the top and kept growing.

The peroxide and yeast have an exothermic reaction (it releases heat) which burns all the peroxide away leaving hydrogen and oxygen which with the washing up liquid means it turns into harmless foam. The reaction continues until all the yeast or the peroxide is gone so the foam keeps growing.

Or as Ramsay put it…

There was a bottle and it went over the bottle and made a volcano!

Here are our volcanic eruptions:

Some seemed to go on for longer and make more foam.

We carefully touched the foam – it was warm!

When they slowed right down the, Ailie took the dangerous bottles away.

So then we were left with coloured foam. Hmmmm what could we do with that? Well we had to play and explore the texture and colours of course!

We were fascinated with the mixing colours.

The afternoon children were more tentative.

After a while it all turned pink and slimy.

We found we could draw patterns and marks in it.

It was great for early writing patterns.

Eventually the mixture got a little too runny. But it was fun to make a huge circle pattern by running around and around the tough spot. There was only one way to make it better….

The instructions for elephants toothpaste can be found on Pinterest. The hydrogen peroxide can be bought at Sally’s and the yeast can be bought at any supermarket in the baking section.

Please remember that anti bacterial washing up liquid is NOT to be used in the experiment. Cheap bubble bath can be substituted instead.

Why not have a go yourself? Don’t forget to share how you get on in our comments.

Happy experimenting!

Campus, chemistry

Mad Mixing!

January 29, 2016 Ailie Rankin Leave a comment

Inspired by Isla and Amelia’s interest we looked at potion making, chemistry and solutions.

We started of by thinking about what happens when things mix. Most children predicted it would just change colour.

The bottle holds vinegar, the balloon hold bicarbonate of soda.

The chemicals reacted and released a gas! It expanded and made the balloon inflate!

It didn’t just change colour! It created a gas that inflated the balloon. And boy did the balloons inflate!

Millie predicted the balloon would grow to touch the ceiling!

Mason thought the inflating would be multiplied by tipping the vinegar into the balloon. (It didn’t.)

Noemi checked the tension of the balloon by tapping gently with the magnifying glass.

The balloons made different shapes depending on the amounts of soda and vinegar that was mixed.

Some of the mixtures spilled out of the balloons due to the pressure.

The solution that had spilled out felt fizzy on our fingers.

We decided to investigate what made the fizz and the gas. Could we recreate the reaction with other materials?

The mad mixing potions began!

We used a range of household chemicals and substances : conditioner, bubble bath, baby oil, vinegar, bicarbonate of soda, effervescent vitamin tablets, warm water, cold water, carbonated water. And we got a range of results!