competitions & quizzes...pit your wits & win with Planet Science
the february filter...
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
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
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
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
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.
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
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
08 How much saliva do our bodies produce each day to help us break down our food?
100 ml
1 litre
10 litres
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
10 What chemical is removed from coffee beans by soaking them in water before they are roasted?
Caffeine
Sugar
Coffee oil
Answers
1= Filtration • 2= Salt • 3= Red blood cells • 4= Lead • 5= It makes the drink 'stronger' • 6= Milk • 7= Shark • 8= 1 litre • 9= Cool the water very slowly • 10= Caffeine
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