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14 Cards in this Set
- Front
- Back
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Water cycle |
The continuous recirculation of water |
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Screening |
Passing water through a wire mesh to remove any floating debris like twigs, plastic bags ect |
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Settling |
When the water flows into large tanks called settling tanks or sedimentation tanks . As the water flows into these tanks, aluminum sulfate (alum) is added to the water. The aluminum sulfate take the cloudiness out of the water and leaves the water clear. The cloudiness in the water is caused by small particles suspended in the water. |
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Filtration |
The water is then passed through filter beds. These consist of layers of sand and gravel. The purpose of the filter beds is to ensure that even the smallest particles of dirt we removed from the water. |
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Chlorination |
Small quantities of chlorine are added to the water to kill bacteria in the water. This process is often called disinfecting or sterilizing the water. |
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Fluoridation |
Fluoride is added to the water as helps to prevent tooth decay in children |
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Hard water |
Water that does not easily form a lather with soap |
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Ions |
Charged particles |
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Calcium ions + soap ions = |
Scum |
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Deionised water |
Water which has all its ions removed |
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Positive electrode |
The piece of platinum connected to the positive terminal of the battery |
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Negative electrode |
The piece of platinum connected to the negative terminal |
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Word equation for electrolises |
Water ----> hydrogen & oxygen |
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Electrolysis |
The production of a chemical change by electricity |
