Fertiliser contains nutrients for plant growth, typically nitrogen and phosphorus. Much of the fertiliser applied to farmland washes off into rivers and lakes during rainfall events. A high concentration of nutrients in a river or lake is called eutrophication. Algae, like plants, need nutrients to grow, and their growth in lakes is usually limited by a lack of nutrients. This means, any additional input of nutrients into a lake can result in an algal bloom. An algal bloom typically changes the trophic and ecological state of a lake, and can be harmful to other organisms who are adapted to less nutrient-rich conditions. Once the algae deplete the nutrients, a mass algal die-off will occur. The algal biomass will decompose, resulting in anoxic conditions, which places additional stress on aquatic organisms.
Explanation:
Instruments are designed and calibrated to take measurement of certain properties in the environment.
Most scientific instruments measures quantitatively, a wide range of physical and chemical properties.
- Thermometers are used in measuring temperature
- Hydrometer is used in measuring density
- Triple balance measures mass
- A weight scale records weight
- Hydrometer measures relative humidity
- Rulers are for measuring lengths
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The molar enthalpy of vaporization of the substance is 84.3 kj/mol.
<h3>What is molar enthalpy of vaporization?</h3><h3 />
Molar enthalpy of vaporization is the energy required to vaporize one mole of a liquid at its boiling point.
0.433 moles of the substance absorbs 36.5 kj of energy when it is vaporized.
1 mole of the substance will absorb 36.5 kJ × 1 /0.433mol = 84.3 kj/mol
Therefore, the molar enthalpy of vaporization of the substance is 84.3 kj/mol.
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A journal could be used as a recording device to share and show proof of scientific data.
Answer:
both A and B
Explanation:
Together, the number of protons and the number of neutrons determine an element's mass number.