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Year 11 Exam  >  Year 11 Tests  >  Test: Water: Chemical Tests & Substances in Water from Natural Sources - Year 11 MCQ

Test: Water: Chemical Tests & Substances in Water from Natural Sources - Year 11 MCQ


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10 Questions MCQ Test - Test: Water: Chemical Tests & Substances in Water from Natural Sources

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Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 1
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What is the color change observed when anhydrous copper(II) sulfate reacts with water, as per the details provided?

Detailed Solution for Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 1
When anhydrous copper(II) sulfate comes in contact with water, it changes color from white to blue. This alteration in color signifies the formation of hydrated copper(II) sulfate as a result of the reaction between anhydrous copper(II) sulfate and water. The observation of this color change serves as a test for the presence of water.
Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 2
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Why is distilled water preferred in practical chemistry settings?

Detailed Solution for Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 2
Distilled water is preferred in practical chemistry due to its high purity levels. It has very low impurities, making it ideal for use in laboratory experiments where the presence of impurities could impact the outcome of chemical reactions.
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Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 3
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How does the melting point of impure water compare to that of pure water?

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The melting point of impure water decreases compared to that of pure water. This is because impurities tend to lower the melting point of a substance. Therefore, observing the melting point can also provide insights into the purity of water samples.
Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 4
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What characteristic of mixtures allows for a range of melting and boiling points?
Detailed Solution for Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 4
Mixtures have a range of melting and boiling points because they consist of different substances that melt or boil at different temperatures. This variability in melting and boiling points can be used as an indicator of impurities within a substance, helping to determine its purity level.
Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 5
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What does the boiling point of water indicate about its purity?
Detailed Solution for Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 5
The boiling point of water increases in the presence of impurities. This is a key principle in chemistry where impurities tend to raise the boiling point of a substance. By observing the boiling point of water, scientists can assess its purity level.
Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 6
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Which of the following substances is commonly found in water from natural sources due to human activities?
Detailed Solution for Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 6
Pathogenic microorganisms are frequently present in water from natural sources as a result of human activities. These microorganisms can pose health risks to humans and other organisms that come into contact with contaminated water. It is essential to treat water properly to eliminate these harmful pathogens before consumption.
Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 7
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What type of substances can rainfall contribute to natural water sources like lakes and rivers?
Detailed Solution for Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 7
Rainfall can wash various substances like nitrates from fertilizers into lakes, rivers, or groundwater. These nitrates can come from agricultural activities where fertilizers are used and can lead to water pollution if not properly managed. Excessive nitrates in water bodies can cause environmental problems such as eutrophication.
Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 8
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What role does dissolved oxygen play in natural water sources?
Detailed Solution for Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 8
Dissolved oxygen is crucial for aquatic life to thrive as it is essential for respiration in aquatic organisms. The presence of adequate dissolved oxygen levels in water is necessary for the survival of fish, plants, and other organisms living in aquatic ecosystems. Insufficient levels of dissolved oxygen can lead to stress and mortality in aquatic organisms, impacting the overall health of the ecosystem.
Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 9
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How do metal compounds in natural water sources benefit aquatic life?
Detailed Solution for Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 9
Some metal compounds in natural water sources offer essential minerals like calcium and magnesium, which are important for the growth and development of aquatic organisms. These minerals play a key role in various biological processes, including bone formation, enzyme function, and overall health maintenance in aquatic life.
Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 10
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What harmful effect do nitrates and phosphates from fertilizers have on natural water sources?
Detailed Solution for Test: Water: Chemical Tests & Substances in Water from Natural Sources - Question 10
Nitrates and phosphates from fertilizers promote excessive aquatic plant growth, leading to a process known as eutrophication. This excessive plant growth can deplete oxygen levels in the water, causing harm to aquatic life by creating oxygen-deprived conditions. Eutrophication can disrupt the balance of aquatic ecosystems and lead to negative consequences for water quality and biodiversity.
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