Mrc Unit 2 Chemistry Water Stage 2

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Mrc Unit 2 Chemistry Water Stage 2 - Quiz

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Questions and Answers
  • 1. 

    What are chemical contaminants?

    • A.

      Elements of compounds that are found in drinking water

    • B.

      Fertiliser pollutants that are found in ground water

    • C.

      Elements or compounds that may be harmful if consumed in drinking water

    Correct Answer
    C. Elements or compounds that may be harmful if consumed in drinking water
    Explanation
    Chemical contaminants are elements or compounds that have the potential to be harmful if consumed in drinking water. These contaminants can include various substances such as heavy metals, pesticides, industrial chemicals, and pharmaceuticals. When present in drinking water, these contaminants can pose health risks and may lead to adverse effects on human health. Therefore, it is important to monitor and regulate the levels of chemical contaminants in drinking water to ensure its safety for consumption.

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  • 2. 

    Why are Heavy metals dangerous in drinking water?

    • A.

      They are toxins that can affect the nerves that control breathing

    • B.

      They are toxins that affect the ability to digest specific amino acids in foods

    • C.

      They are toxins cause changes in the Brain that are irreversible

    Correct Answer
    A. They are toxins that can affect the nerves that control breathing
    Explanation
    Heavy metals are dangerous in drinking water because they are toxins that can affect the nerves that control breathing. When consumed, heavy metals can accumulate in the body and interfere with the normal functioning of the nervous system. This can lead to respiratory problems and potentially cause breathing difficulties or even respiratory failure. Therefore, the presence of heavy metals in drinking water poses a significant health risk.

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  • 3. 

    What is salinity?

    • A.

      The amount of Magnesium and Sodium ions found in water

    • B.

      The amount of Sodium Chloride found in water

    • C.

      The amount of ionic compounds found in water

    Correct Answer
    C. The amount of ionic compounds found in water
    Explanation
    Salinity refers to the amount of dissolved salts and other ionic compounds found in water. It is not limited to just Magnesium and Sodium ions or Sodium Chloride, but includes all types of ions present in the water. Salinity is an important parameter in determining the quality of water, especially in marine environments, as it affects the density, freezing point, and conductivity of water.

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  • 4. 

    Where do salts found in the water system originate from?

    • A.

      Dissolving mineral deposits

    • B.

      From oceans evaporating and transport of ionic salts in atmospheric water vapour

    • C.

      From the decomposition of organic matter such as animals and plant life

    Correct Answer
    A. Dissolving mineral deposits
    Explanation
    Salts found in the water system originate from the process of dissolving mineral deposits. This occurs when water comes into contact with rocks and soil, causing minerals to dissolve and become ions in the water. These dissolved ions, such as sodium, chloride, calcium, and magnesium, contribute to the salt content in the water. This process is natural and can happen in various water sources, including rivers, lakes, and underground aquifers.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 06, 2019
    Quiz Created by
    CB
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