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A Bending Bone
A Bending Bone
Calcium in bones is important to keep them hard and strong - try out the bending bone experiment to see how and why....
Acids and Alkalis: Making Gases
Acids and Alkalis: Making Gases
When an acid is mixed with a carbonate, a type of alkaline chemical, the two chemicals react and form the gas carbon dioxide. This can be quite dramatic!...
Acids and Alkalis: Which Are Which?
Acids and Alkalis: Which Are Which?
A pH indicator is a liquid or paper that changes colour according to how acid or alkaline something is. Make a pH indicator from red cabbage and water....
Breaking Down Colours: What's in Your Pen
Breaking Down Colours: What's in Your Pen
Paper chromatography is a simple form of chromatography, and can separate out the mixtures of different pigments and dyes in black and coloured inks and in food…...
Cleaning Tarnish Off Silver: Bicarbonate and Aluminium
Cleaning Tarnish Off Silver: Bicarbonate and Aluminium
After a while, even the best and most carefully polished silver becomes dull and tarnished, and needs to be cleaned again. Why does it tarnish, and how can it be made…...
Green Coins or Shiny Ones? Oxidation of Copper
Green Coins or Shiny Ones? Oxidation of Copper
Copper coins begin shiny, but become dull. Change the coins back to shiny metal, or make them go green. Even make a hollow coin....
Growing Crystals
Growing Crystals
Crystals are beautiful things, and come in many different shapes. They are easy and fun to grow, using ingredients from around the house....
Ice Cream: Colloidal Chemistry
Ice Cream: Colloidal Chemistry
What is a summer without ice cream? Though it looks simple - milk, cream, sugar and eggs - ice cream has some complicated science keeping it together....
Invisible Ink
Invisible Ink
Invisible ink, sometimes called ‘sympathetic ink’, is a way of writing secret messages. Spies have used invisible inks to pass on secret messages, as have prisoners…...
Make a Soda Fountain
Make a Soda Fountain
Drinks are fizzy because they have carbon dioxide in them. Dropping sweets in makes the drink fizz more - why?...
Making an Emulsion
Making an Emulsion
An emulsion is a stable mixture of oil and water that does not separate. The oil and water are kept together in an emulsion by compounds called emulsifiers....
Making Hot Ice
Making Hot Ice
Water solidifies or turns to ice at zero degrees centigrade. This experiment makes something that looks just like ice but forms at room temperature and gives off heat....
Making Polymers: Cornflour Slime and Silly Putty
Making Polymers: Cornflour Slime and Silly Putty
Polymers are made of long molecules like chains that stick to each other. Natural polymers include hair, wool and cellulose. Plastic is a synthetic polymer....
Soap and Detergent Chemistry
Soap and Detergent Chemistry
Soap is made from animal fats and vegetable oils mixed with sodium hydroxide (lye). The sodium hydroxide reacts with the oil to make soap. Detergents are made from…...
Soft and Hard Water: Making More Bubbles
Soft and Hard Water: Making More Bubbles
Different parts of the country have soft or hard water, because of the levels of dissolved mineral salts. Soap, detergent and toothpaste lather more easily in soft water....
The Science of Making Butter
The Science of Making Butter
Bread and butter go together naturally (especially freshly made bread still warm from the oven). There are records of butter making from around 4000 years ago. Here's…...
Why Oil and Water Don't Mix
Why Oil and Water Don't Mix
Oil is a slippery liquid that burns. Oil is used as a fuel and to make things move easily. Oil and water do not mix - find out why....
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