Read the extract about sea water below and answer the questions that follow - NSC Marine Sciences - Question 3 - 2024 - Paper 1
Question 3
Read the extract about sea water below and answer the questions that follow.
Fundamental changes in sea water chemistry are occurring throughout the world's ocean. ... show full transcript
Worked Solution & Example Answer:Read the extract about sea water below and answer the questions that follow - NSC Marine Sciences - Question 3 - 2024 - Paper 1
Step 1
What type of bonding is found in a CO₂ molecule?
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Answer
CO₂ exhibits covalent bonding. This is because the carbon atom shares electrons with each of the two oxygen atoms, resulting in a stable molecular structure.
Step 2
Why does CO₂ not disassociate in water?
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Answer
CO₂ does not disassociate in water as it is a non-polar molecule. When dissolved in water, it remains intact rather than breaking into separate ions.
Step 3
Due to its effect on atmospheric temperature, what type of gas is CO₂ considered to be?
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CO₂ is considered a greenhouse gas. This classification is due to its ability to absorb and re-radiate heat, contributing to the greenhouse effect.
Step 4
Describe the relationship between CO₂ and global temperatures.
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There is a positive correlation between CO₂ levels and global temperatures. An increase in CO₂ leads to greater heat retention in the atmosphere, resulting in rising global temperatures.
Step 5
Explain what impact increased levels of CO₂ in the ocean will have on sea urchins.
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Increased levels of CO₂ in the ocean can lead to ocean acidification, which adversely affects sea urchins. This may result in the dissolution of their calcium carbonate shells, impairing their survival and reproduction.
Step 6
In your opinion, will an increased proportion of CO₂ in the ocean be beneficial to algae? Give a detailed motivation for your answer.
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Answer
Increased CO₂ can promote algal growth due to enhanced photosynthesis. However, this could lead to harmful algal blooms, affecting marine ecosystems negatively. Thus, while short-term growth may occur, longer-term consequences could disrupt aquatic balance.
