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 Water 40 Flashcards |
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What percentage of the Earth's surface is covered by water? |
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71% |
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Which type of water is considered the purest form? |
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Rainwater |
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Riddle: I can be solid, liquid, or gas, but I'm most essential for life. What am I? |
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Water |
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True or False: Groundwater is collected above the ground and is easily accessible. |
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False. Groundwater is water that collects under the ground after rainwater seeps down. |
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The continuous movement of water between land, water bodies, and the air is called ______. |
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Water Cycle |
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Which process involves the removal of harmful chemicals, dirt, and germs from water? |
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Purification of water |
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What is the boiling point of pure water under normal air pressure? |
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100°C |
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Fill in the blank: Water that does not form lather with soap is called ______. |
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Hard water |
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Which method of purification involves boiling water to kill germs? |
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Boiling |
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True or False: Ice is denser than water at 0°C. |
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False. Ice is less dense than water, which is why it floats. |
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What type of water has dissolved salts that prevent soap from forming lather? |
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Hard water |
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Riddle: I can dissolve many things, but I am not a solid. What am I? |
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Water |
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What is the term for the maximum density of water occurring at 4°C? |
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Anomalous Expansion of Water |
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How does the freezing point of water change with pressure? |
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The freezing point decreases with an increase in pressure. |
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Fill in the blank: The process of water purifying using layers of sand, gravel, and charcoal is called ______. |
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Filtration |
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What happens to the solubility of solids in water as the temperature increases? |
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Solubility increases. |
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True or False: Potable water is water that is safe for drinking. |
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True. |
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What is the chemical change that occurs when sodium chloride dissolves in water? |
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NaCl (s) → Na⁺ (aq) + Cl⁻ (aq) |
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Riddle: I can turn blue crystals into a white powder when heated, but add water back, and I'm blue again. What am I? |
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Copper sulphate (CuSO₄) |
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What are the two types of hardness in water? |
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Temporary hardness and permanent hardness. |
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