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Questions and Answers
Which of the following is true about water?
Which of the following is true about water?
- Water is used in chemical production plants (correct)
- Water covers 50% of the earth's surface
- Water is not present in fruits and vegetables
- Water is not a constituent of our surroundings
What percentage of the human body is water?
What percentage of the human body is water?
- About 30%
- Over 90%
- Less than 10%
- Around 60% (correct)
Where is about 97% of Earth's water found?
Where is about 97% of Earth's water found?
- In lakes and streams
- In aquifers underground
- In the atmosphere
- In the oceans (correct)
What is the composition of water by weight?
What is the composition of water by weight?
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What is one of the main uses of water in chemical production plants?
What is one of the main uses of water in chemical production plants?
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Study Notes
Water Facts
- Water comprises approximately 60% of the human body, playing a critical role in numerous physiological processes.
- About 97% of Earth's water is found in the oceans, which are primarily saline and not suitable for drinking or irrigation.
- The composition of water is H2O, meaning each molecule consists of two hydrogen atoms and one oxygen atom, with hydrogen accounting for roughly 11% and oxygen around 89% of the weight of water.
- One of the main uses of water in chemical production plants is as a solvent, which facilitates various chemical reactions and processes, enhancing the efficiency of production.
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