revision
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| what is the composition of water | 2 hydrogen atoms and 1 oxygen atom
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| what is the test for water | anhydrous copper sulphate turns from white to blue
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| what causes water hardness | calcium and magnesium ions
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| give two methods of getting rid of hard water | boiling and using an ion exchange resin
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| how is scum formed | calcium ions and soap form scum
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| explain the term electrolysis | electrolysis is the production of a chemicl change by electricity
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| why is sulphuric acid added to the water in the electrolysis experiment | to help the water conductg electricity
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| give an advantage of hard water | provides calcium for bones and teeth
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| give a disadvantage of hard water | blocks pipes, leaves scale on kettles and boilers
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| how can we test to show oxygen is produced during electrolysis | use a glowing splint - it reignites
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| how can be test to show hydrogen is produced during electrolysis | use a glowing splint - it burns with a pop
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| in the ion exchange resin what ion replaces the calcium ion | sodium ions
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| when water is boiled what is the dissolved hydrogen carbonate changed to . | solid limestone called 'fur'
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| what is soft water | water that lathers easily with water
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| The water treatment process involves 5 stages which of the 5 stages involves adding a substance to the water | chlorination, fluoridation and settling
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| what is the name of the chemical added to get rid of germs | chlorine
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| whatis the name of the chemical added to help to reduce tooth decay | fluoride
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| whaqt is the name of the chemical used to take the cloudiness out of the water | aluminium sulphate
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
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Created by:
mariepkelly
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