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How does a reverse osmosis water purification system operate?

1. Untreated water is subjected to low pressure, causing it to move through a highly permeable membrane, which captures contaminants.
2. Untreated water is subjected to high pressure, causing it to move through a highly permeable membrane, which captures contaminants.
3. Untreated water is subjected to low pressure, causing it to move through a semi-permeable membrane, which captures contaminants.
4. Untreated water is subjected to high pressure, causing it to move through a semi-permeable membrane, which captures contaminants.

Answer :

Final answer:

Reverse osmosis water purification works by applying high pressure to untreated water to force it through a semi-permeable membrane, effectively filtering out contaminants and desalinating seawater.

Explanation:

A reverse osmosis water purification system operates by applying high pressure to untreated water, causing it to move through a semi-permeable membrane. This process filters out contaminants because the membrane is designed to be only permeable to water molecules, while preventing larger ions and molecules, which are responsible for the water's impurities, from passing through. The water is pushed from an area of high solute concentration to an area of low solute concentration, resulting in purified water. This technique is widely used for various applications, including desalination of seawater and improving water quality for drinking purposes.

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The correct answer is 4. Untreated water is subjected to high pressure, causing it to move through a semi-permeable membrane, which captures contaminants.

Reverse osmosis is a water purification process that uses a semi-permeable membrane to remove contaminants and impurities from water. In this process, untreated water is forced through the membrane at high pressure, causing the water to flow from the more concentrated side to the less concentrated side. The membrane allows water molecules to pass through, while trapping larger particles and contaminants, such as minerals, salts, and bacteria. The purified water that passes through the membrane is then collected and stored in a separate tank, while the concentrated water that contains the contaminants is flushed away.