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Have you ever tried to inflate a balloon using magic (and chemistry)? This experiment uses the reaction between an acid (vinegar) and an carbonate (baking soda) to produce lots of fizzy carbon dioxide gas.

What you need:

An empty plastic bottle, 500ml or smaller.

Vinegar (any type)

Baking soda

A balloon

Spoon

Funnel (or roll a piece of paper into a cone)

Safety goggles

What to do:

  1.  Put your goggles on. This activity is safe but vinegar can squirt out if there’s a small hole in the balloon!
  2.  Carefully pour about 100 ml of vinegar into the bottle.
  3.  Use the funnel (or rolled up paper cone) to put a couple of teaspoons of baking soda into the balloon.
  4.  Stretch the balloon over the top of the bottle without letting the powder drop in.
  5.  When you’re ready, tip the balloon so that the powder falls into the bottle…it should inflate by itself!

If you want to impress your friends or family, you could say a ‘magic’ spell when you tip it and prove that you should be off to Hogwarts!

So what’s going on?

The vinegar is an acid and the baking soda is an alkali, these are opposite types of chemical and they will react together. Because the baking soda is a special kind of alkali called a carbonate, the reaction makes lots of carbon dioxide gas. This is the same gas that we make in our bodies when we release energy from our food (and then we breathe it out).

Think like a scientist:

This activity is a demonstration. To make it into an experiment, you could try changing the type of acid…you could use lemon juice, orange juice or a different type of vinegar. Or you could try adding a different amount of baking soda, use different shapes of balloons or different sized bottles. Remember, science is all about asking questions and working out a way to find out the answer!

You can find out more about acids and alkalis with our Colour changing cabbage experiment and if you like reactions with vinegar and baking soda, check out volcanoes.

If you would like to try out lots more experiments with your very own Fab Scientist, we can bring the Fab Science lab to your birthday party, school or event. Get in touch to find out more.

 

 

 


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Make your own bottle rockets!

All you need is: a piece of plastic plumbing tube (very cheap in any DIY store), a short piece of hose-pipe, an empty lemonade bottle, some paper, glue and Sellotape.

To make the rocket: roll a piece of A4 paper around the plastic tube. Use glue to keep the paper rolled up but do not stick it to the plastic tube! Push the paper over the end of the plastic tube so that you can fold the end over and stick it down with plenty of Sellotape. Take it off the plastic tube and that’s your rocket done…it’s that simple! You can decorate it if you like.

To make the rocket launcher: attach the hose to the neck of the bottle, again use plenty of tape to make sure no air can escape around the sides of the hose. Stick the plastic tube on the other end of the hose and make sure it is well sealed too. Your rocket launcher is ready to go.

To launch the rocket: Find an outside space that has plenty of room for a safe launch. Make sure the rocket can’t hit anyone or end up in a road. Slide the paper rocket onto the plastic tube. If you STOMP on the bottle, the air inside will be squashed and will rush through the tube under high pressure. This will make the rocket fly up in the air. You may want to get someone else to hold the tube so that you can get a really big stomp!



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All living things* have DNA; animals, plants, fungi, even teeny tiny bacteria. It’s what makes us who we are. At ‘All About Me’ camps, we made models of DNA and also had a look at some real DNA that we extracted from strawberries. There were lots of requests for instructions on how to do this at home so here is the recipe!

You need:

  • Two strawberries
  • Surgical spirit (available in any chemist)
  • Washing up liquid
  • Table salt
  • Ziplock bag (use pestle and mortar to avoid using plastic bag)
  • Plastic cups or beakers
  • Small glass (shot glass would be ideal)
  • Small sieve or tea strainer
  • Tweezers or cocktail sticks

 

What to do:

  1. Put the surgical spirit in the freezer at least an hour before you start. Leave it there until step 8.
  2. Remove the leaves from the strawberries and put the fruits in the bag.
  3. Mash the strawberries! This is the fun bit…don’t break the bag though. You can squash the strawberries in a pestle and mortar (or bowl and spoon!) instead to avoid plastic waste.
  4. To make the extraction mixture which will break open the cells and let the DNA escape: measure 90ml water into a beaker or cup, add a teaspoon of salt and two teaspoons of washing up liquid. Stir slowly…we want it mixed but not bubbly.
  5. Add 4 teaspoons of the extraction mixture to your bag of mashed up strawberries. Mix GENTLY.
  6. Sieve the strawberries into a clean beaker.
  7. Pour this into your small glass. The DNA is now free in the mixture instead of being stuck inside cells but it is VERY thin so we can’t see it.
  8. Carefully pour some cold surgical spirit on top of the strawberry liquid. You should see a cloudy white layer appear, this the DNA! The alcohol makes it clump together so you can see it. You can pull this out with tweezers or a cocktail stick to have a proper look.

 

*All cellular life on Earth has DNA. Some viruses have another molecule called RNA instead but it’s a bit of tricky question to decide if viruses are actually alive anyway. Of course, we don’t know if any lifeforms that may exist on other planets have DNA or something else entirely.


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Make your own Christmas gifts, with help from a little bit of science!

A chemical reaction that you can eat: honeycomb

All cooking is chemistry in action but my favourite edible experiment is honeycomb or cinder toffee. If you want to get all technical, this reaction is the thermal decomposition of sodium hydrogen carbonate to produce sodium carbonate, water and carbon dioxide gas. Basically, heat up baking soda and it gives off gas! If it is mixed up in some lovely gloopy melted sugar when this happens, you’ll get bubbly toffee which makes a great Christmas present for someone with a sweet tooth.

You will need: 200g caster sugar, 5tbsp golden syrup and 2tsp baking soda. Heat the sugar and syrup in a pan while stirring (this is definitely a grown up job!), when it is all melted and golden, remove from the heat and quickly stir in the baking soda. Watch as the chemical reaction happens and bubbles of carbon dioxide form in the toffee. Quickly pour onto a greased baking tray and wait for it to cool before testing out your tastebuds!

Fizzy bath bombs

These bath bombs don’t actually explode but they will fizz away when you put them in the bath. All the ingredients can be found in your kitchen/bathroom cabinet or can be bought in the supermarket (except citric acid which you can find in a chemist or homebrew section, I picked some up in Wilkos for 75p).

You will need:

Corn flour (2 tablespoons)

Citric acid (2 tablespoons)

Bicarbonate of soda (4 tablespoons)

Oil – coconut or olive are good (1 tablespoon)

Optional extras:

Food colouring

Fragranced oil/perfume (check it’s safe on skin)

A few dried flower petals (crushed)

 

What to do:

Mix the corn flour, citric acid and bicarbonate of soda together in a bowl (and flower petals if using). If you want to use fragrance and/or colouring add a few drops to the oil in a plastic cup. Then add the oil slowly to the dry ingredients, mixing in between. You may need add a bit more oil if it doesn’t form a paste (not too much though). When it’s nicely mixed, shape it into balls and leave them to dry on greaseproof paper. They’ll be fully dry in a couple of days then store them in an airtight tub. Pop the balls into cupcake cases and people will think that you have made lovely, thoughtful gifts, not just had fun with science!

 

What’s going on?

The bicarbonate of soda and citric acid will form a chemical reaction, making lots of carbon dioxide gas. This gas makes the fizzing and bubbles that you see when the bomb is dropped into water. The chemicals can’t react together when they are dry so the fun only starts in the bath!

 


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Eat your greens! No more sweets! Drink your milk! No fizzy drinks! Parents are always telling us what to eat but why? Investigate food packaging to find out which foods contain lots of sugar or plenty of good stuff like calcium and fibre. If you have access to the internet, you can experiment with making the healthiest and unhealthiest meals on the McDonalds nutrition calculator. Try out these investigations at home to see what happens if we don’t have enough calcium in our diet or eat too much sugar.

A trip to the dentist

Firstly, let’s look at what different drinks do to our teeth. If you can convince the tooth fairy to leave your teeth behind in the name of science, you can use real teeth. Otherwise, hard boiled eggs are a good substitute*. Pop each one in a plastic cup with a different drink; sugary cola, sugar-free cola, orange juice, fizzy water, tap water, anything you like. If you really want to see what acid does to your teeth, try putting one in vinegar! You might not think that you’d drink vinegar but bacteria in your mouth turn sugar to acid, so sugary things end up being acid in your mouth. This is why it is so important to brush your teeth! Leave the teeth or eggs in the drink for a week and then have a look for any changes.

Bendy bones

Want to see what happens to bones when they don’t have calcium in? Try bending a clean chicken bone to see how stiff it is, then pop it in vinegar for three days. Rinse it off and try bending it, has it gone all rubbery? Can you explain why?

*Note for super scientists: are eggs really a good substitute for teeth? Of course your teeth are much stronger than the eggshells but they are made of a similar material. The egg shells contain mainly calcium carbonate while tooth enamel is mainly calcium phosphate but both dissolve in acid.

You can find more cool experiments on our Home Science page…or book a Fab Scientist to visit your birthday party or school for lots of whizz-popping science fun!


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Lava lamps work by taking two substances that don’t mix (usually wax and water) and then heating it to make the ‘lava’ move around. This version doesn’t need wax or heat, just cooking oil, coloured water and a bit of chemistry.

You will need:

•       1 empty plastic bottle (500ml is a good size, still water bottles work best as they have a flat bottom!).

•       Water

•       Food colouring

•       Oil (any vegetable oil will do)

•       Fizzy tablets (soluble vitamin C, cheap versions from a pound shop are perfect!)

•       Small light or torch (pound shop good for this too!)

•       A tray to catch any spillages

First we need to assemble the lava lamp. Stand the bottle on the tray and half fill with water, pop a few drops of food colouring in until you’re happy with the colour. Next, pour in the oil, nearly up to the top (you might need a funnel and a grown-up for this bit!). Leave it to settle for a few minutes, when all the oil is at the top it is ready.

Now to make it move. Drop in a small piece of a fizzy tablet and watch what happens. You should see the bubbles carrying the coloured water up through the oil. You can stand the bottle (carefully!) on a small light or hold a torch underneath it for a real lava lamp effect.

If you want to keep it for another day you can put the lid on … but you MUST wait for it to stop fizzing first. If you put the lid on too soon gas will build up and it could be dangerous.

So how does this work? Oil and water won’t mix because oil is hydrophobic (this means it does NOT like water). The fizzy tablet reacts with the water to make carbon dioxide gas (just like the vinegar and bicarbonate of soda experiments). These bubbles of gas are less dense, basically lighter, than the oil so can bubble up to the top.

You can find lots of experiments to try on our Home Science page…or invite a Fab Scientist to your birthday party or school for more cool science fun!


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Oobleck is simple to make but the most messy fun you can have with your kitchen ingredients. All you need is some cornflour and water, about a cup of water mixed with a cup and a half of cornflour works well. You can add a bit of food colouring if you like. Green is slimetastic but go with any colours you fancy, pink and glittery can be lots of fun.

Now to experiment…

Try to decide if the Oobleck is a solid or a liquid. Try to press it hard, solid or liquid? Try pouring it, solid or liquid? It’s actually neither, it has a fancy scientific name of a ‘non-Newtonian fluid’, this means it can behave like either. Try stabbing it hard with a spoon, suddenly it’s solid, let the spoon rest on top and it sinks. Weird, huh? You can squeeze it into a ball, it feels all hard but as soon as you let go (or hand it to an unsuspecting victim!) it will collapse and go runny. Make up your own experiments, get your hands in it, get gooey and have fun. When you’re done, leave it to dry and keep for another day (don’t use it in the gravy though!).

Good vibrations

The Oobleck gets even more odd if you get them vibrating. I’ve put some on an old speaker (covered in clingfilm) and played some loud music through it. If you get the right sounds, the oobleck will start to jump and dance about. There is a video on our Facebook page if you want to see this without risking your speakers! There are also some amazing videos on YouTube of people who have taken the oobleck experimenting to the extreme by filling whole swimming pools with it!

So what’s going on?

The tiny bits of cornflour have jagged edges, when you press them together they get stuck and can’t move past each other, so you have a solid. If you stop pressing, they come unstuck and can flow again like a liquid.

There are lots more home science experiments to try on our Home Science page. Or invite a Fab Scientist to your birthday party or school and we’ll bring all the kit and take away the mess!


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Fun with crystals

If you look closely at sugar or salt, you will see it is made up of lots of little crystals. We can ‘grow’ bigger crystals if we start from scratch and let them form slowly. So how do we make a crystal from scratch? We need to dissolve the salt or sugar and then let it recrystalise. You can try out these two experiments to make some rock candy and geodes. Both of these involve boiling water so definitely one for some grown-up help.

Rock candy

Heat a cupful of water in a pan until it is boiling. Then start adding sugar. Stir, add more sugar, stir, add more sugar, stir…you get the idea! Keep going until you cannot get any more to dissolve, this should be at least two cupfuls. This is called a saturated solution. Let the mixture cool down for around 20 minutes then pour into a tall glass. When the solution cools we say it supersaturated, this means it now has more sugar than it can normally hold. It’s ready to start growing crystals! If you hang a bamboo skewer into the glass (use a clothes-peg to keep it in place), crystals of sugar will start to form on the skewer. Remember we need SLOW formation so it will take a few days, perhaps even a week, be patient! It’s really important that it is left undisturbed for this time so put it somewhere out of the way.

Geodes

Geodes are mineral crystals found inside rocks, we can make our own inside eggshells. Make sure the eggshells are perfectly clean and the membrane has come away from the inside. Make a saturated solution like you did before, you can use sugar or try table salt or Epsom salts, then add a little food colouring. Pop the shells in an egg box and fill with this solution, the fuller the better but make sure they won’t spill! Leave them somewhere safe to evaporate and in a few days you should see the geodes form!

Crystals in nature

Crystals form in nature when some things become solids. This can be rocks that were molten (lava) or minerals that were dissolved in water. Molten rocks will solidify as they cool, dissolved mineral will crystalise as the water evaporates.

The size of the crystals depends on the time that they take to form. Fast=small, slow=big. Igneous rocks (ones that are made from lava or magma) might have small crystals if they came from a volcano as they would cool quickly in the air. Sometimes igneous rocks can be made slowly underground and we can often see larger crystals in these. Geodes come from dissolved minerals seeping into gaps in other rocks, the water evaporates soooo slowly that we get beautiful big crystals. You can try putting your egg geodes in different places when they are evaporating, perhaps one on a radiator, one on a windowsill and one somewhere cold. Just make sure they’re not going to get knocked over!

 


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It’s time to get messy! Here is one you definitely don’t want to do in your kitchen, take the experimenting outdoors.

You may have already seen or heard about the Coke and Mentos experiment. Basically you drop some Mentos in a bottle of Diet Coke and stand well back as it makes a big fizzy mess! First, you need to know what is going on. Fizzy drinks are just flavoured drinks that have a whole load of carbon dioxide gas dissolved into them. The gas stays trapped inside for as long as the lid is screwed on tight, when you take the lid off it will slowly come out as small bubbles. This is what makes the drink ‘fizzy’. If you’re a very patient person who really likes watching bubbles, you could sit and watch it for a couple of days while each bubble gradually makes its way out. I’m guessing that you would like something a bit more dramatic! By dropping things into the bottle, you can get all those bubbles to form at once and rush out of the bottle in a big fountain. The most famous example is the Mento but it is not the only contender for best fizz-producer. You can try out other sweets, salt, sugar, cake sprinkles…whatever you have in the cupboard. Try different drink brands and flavours, which is best? All of them work by the rough surface of the sweet providing ‘nucleation sites’, these are places where bubbles can easily form. Give them lots of nucleation sites and get lots of bubbles…simple!

You can see a slo-mo video of one of our explosions on our Facebook page. We’d love to see your exploding fizzy drinks so do share your videos with us on Instagram, Facebook or Twitter!

Two very important things that you need to know: (1) This is an OUTDOOR experiment!!! It makes a big mess so make sure it is on the grass or somewhere that spillage doesn’t matter. (2) Only use sugar-free drinks, they simply work better (and don’t leave a horrid sticky mess that will attract every ant in the world to your garden). You might like to make a cardboard tube ‘launcher’ so you can drop several sweets in at once. Be warned it ‘erupts’ pretty quickly so stand back!

And … do this outdoors (did I mention that?).

There are lots more experiments to try on our Home Science page. If you’d like a visit from a Fab Scientist to bring even more cool stuff to your birthday party or school, give us a shout!

Click here for more experiments


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When you hear someone speak, you don’t just hear what they are saying. You can also tell where they are. Trick your ears by making this simple ‘Ear Switcher’. All you need is about a metre of hosepipe, a couple of funnels and some sticky tape. Cut the hose into two pieces, stick a funnel in the end of each one, then tape it together as in the picture. If you have a plastic Alice band, stick the whole thing on that to make it easier. Pop it on your head and hold the free ends of the tube in your ears (never stick anything right into your ear!). Now close your eyes and get someone to make noises, can you work out where they are? We normally work out direction because sounds reach one ear before the other. Sound travels super-fast (over 700 miles per hour) so there is only about a two-thousandth of a second between hearing it in one ear and then the other. Your brain is clever enough to notice that difference and use it work out a direction….until you confuse it with an Ear Switcher!