Mrc Unit 2 Chemistry Water Stage 2

1. What are chemical contaminants?

Elements of compounds that are found in drinking water

Fertiliser pollutants that are found in ground water

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

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.

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.

2. Why are Heavy metals dangerous in drinking water?

They are toxins that can affect the nerves that control breathing

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

They are toxins cause changes in the Brain that are irreversible

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.

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.

3. Arrange the following sources of water on Earth from highest volume (5) to lowest volume (1)

Oceans

Ice Caps and Glaciers

Groundwater

Atmosphere as Water vapour

Rivers

Submit

4. What is salinity?

The amount of Magnesium and Sodium ions found in water

The amount of Sodium Chloride found in water

The amount of ionic compounds found in water

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.

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.

5. Where do salts found in the water system originate from?

Dissolving mineral deposits

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

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

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.

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.