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Water
Science Junior cert
| Question | Answer |
|---|---|
| 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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