How do you think of February? Bit dull? Bit grey? Valentine's day to dread?! Well in ancient Roman times a great feast of purification took place and the name February comes from the Latin 'februare' – to purify. So here's our tribute to all that purifying, a quiz about getting stuff you do or don't want out of other stuff. What better prize, by the way, than a desk top coffee maker, for some filtering close to home. Hope you can extract all the right answers out of this little lot….
	01 How do they get the 'bits' out of orange juice? Filtration Distillation Sublimation Reveal answer 02 Sodium Chloride is made from sea water by evaporation, it is found in nearly every home.  What is its common name? Salt Bleach Vinegar Reveal answer 03 The kidneys are the body’s filters.  They remove lots of different chemicals from the blood.  Which of these substances do they NOT remove? Water Urea Red blood cells Reveal answer 04 Water may seem pure but it contains lots of different chemicals – which of these would you have to worry about if you found it in your water? Calcium hydrogen carbonate Lead Chlorine Reveal answer 05 What does distillation do to an alcoholic drink? It makes the alcohol more concentrated and the drink ‘stronger’ It brings out the flavour of the fruit used to make the drink. It disguises the taste of the alcohol. Reveal answer 06 Emulsions are mixtures of two substances, usually oil and water that normally don’t like to mix.  Mayonnaise is an emulsion – which of these foods is also an emulsion? Milk Toast Cornflakes Reveal answer 07 Recent research shows that some fish contain large amounts of mercury from sea pollution.  We should limit our consumption of which if these fish? Trout Shark Sardines Reveal answer 08 How much saliva do our bodies produce each day to help us break down our food? 100 ml 1 litre 10 litres Reveal answer 09 Ice cubes are usually cloudy because the water isn’t pure.  It contains dissolved air that forms bubbles in the ice.  What is the best way to try and make clear ice cubes? Cool the water really quickly Cool the water very slowly until it is frozen Add salt to the water before freezing it Reveal answer 10 What chemical is removed from coffee beans by soaking them in water before they are roasted? Caffeine Sugar Coffee oil Reveal answer Back to Quizzes & Competitions