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Science Junior cert

Name the two elements that water is made of Hydrogen and Oxygen
What is the chemical formula for water ? H2O
What would you use to test for water? Cobalt chloride paper
What is the freezing point if water? 0C
What is the boiling point of water? 100C
Water is an ------------------- solvent Excellent
What is the first stage of the water cycle? Evaporation of oceans
What happens in the second stage of the water cycle Condensation to form clouds
What happens in the third stage of water cycle Rainfall
What do you call the water treatment step that involves the removal if large debris through a wire mesh Screening
What do you call the water treatment step that allows medium size particles to settle at bottom Settling
What do you call the water treatment step that involves passing the water over sand and gravel Filtration
What do you call the water treatment step that involves the addition of chlorine to kill bacteria Chlorination
What do you call the water treatment step that involves the addition of flourine compounds to help prevent tooth decay Fluoridation
The purest form of water is called what?. Distilled water
Water always contains ------------------solids Dissolved
Water that does not lather easily is called what? Hard water
Water that does lather easily is called what? Soft water
What causes hardness in water Calcium ions
What is limestone more commonly known as Calcium carbonate
What do you call the process that removes the calcium ions from hard water Ion exchange
What do you call the bead like material that you pass the hard water through to remove the calcium ions Ion exchange resin
Is the water that passes through the ion exchange resin, hard or soft water Soft water
What do you call the water that has been passed through the ion exchange resin Deionised water
What do you call the production of a chemical reaction by electricity Electrolysis
What is the name of the apparatus used to used in electrolysis Hoffman Voltameter
Why do you add acid to the water in electrolysis To conduct electricity
What is formed as a result of electrolysis H2 and O2
Why is there twice as much hydrogen gas as oxygen gas produced in electrolysis Because each water molecule has two hydrogen atoms and one oxygen atom
How would you determine if water samples were hard or soft Add soap solution and shake to see if a lather (bubbles) form
How would you prove that water contains dissolved solids Evaporate the sample and solids will be left behind on the clock glass
Created by: gcu science



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