Chemistry
Below are our 15 articles in the chemistry' category:
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...
The pH scale is a scale of numbers that describes how acid or alkaline (another word for alkaline is ‘basic’) something is. A pH indicator is a...
Chemistry uses chromatography to separate mixtures of chemicals. The word chromatography comes from the Greek words for ‘colour’ and ‘to write’....
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...
New pennies and two pence pieces are bright copper, but after a while, they turn dull. This is because the copper reacts with oxygen in the air to...
To grow crystals, you need to start with a saturated solution – water that has as much, sugar, salt or whatever crystal ingredient dissolved in it...
What is a summer without ice cream cones, or a slice of apple pie without a melting scoop of vanilla ice cream? Though it looks simple – cream,...
Invisible ink, sometimes called ‘sympathetic ink’, is a way of writing secret messages. Spies have used invisible inks to pass on secret messages,...
Drinks are fizzy because they have carbon dioxide in them – the gas is forced into the drink at low temperatures and dissolves.
Homemade fizzy...
Oil and water are described as immiscible liquids – liquids that do stay mixed together (see ‘Why Oil and Water Don't Mix’). Even if oil and water...
Polymers are made of long molecules like chains that stick to each other (cross-link). Natural polymers include hair, wool and cellulose (in...
Soap is made from animal fats and vegetable oils, mixed with a caustic chemical called sodium hydroxide (also known as lye). The sodium hydroxide...
Different parts of the country have soft or hard water. Hard water is water that has travelled through certain types of rock, including limestone,...
Bread and butter go together naturally (especially freshly made bread still warm from the oven). There are records of butter making from around 4000...
Oil and water don’t mix – they are described as ‘immiscible’. Crude oil floats on the sea after a spill from a tanker. Motor oil shows up as a...
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