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Questions and Answers
What property of water allows it to resist changes in temperature?
What property of water allows it to resist changes in temperature?
What percentage of water content is found in human brain cells?
What percentage of water content is found in human brain cells?
What bond angle do water molecules form due to their structure?
What bond angle do water molecules form due to their structure?
Cohesion refers to the attraction between water molecules and different substances.
Cohesion refers to the attraction between water molecules and different substances.
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Water can dissolve non-polar substances effectively.
Water can dissolve non-polar substances effectively.
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What role do hydrogen bonds play in the properties of water?
What role do hydrogen bonds play in the properties of water?
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Nonpolar molecules have charged regions.
Nonpolar molecules have charged regions.
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What is the term for water's ability to stabilize temperature in living organisms?
What is the term for water's ability to stabilize temperature in living organisms?
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Water is known as the ___ solvent due to its ability to dissolve many substances.
Water is known as the ___ solvent due to its ability to dissolve many substances.
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What are hydrogen bonds responsible for in water?
What are hydrogen bonds responsible for in water?
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Water acts as an excellent __________ for polar and ionic substances.
Water acts as an excellent __________ for polar and ionic substances.
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Water is known as a __________ because it can dissolve many substances.
Water is known as a __________ because it can dissolve many substances.
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Which of the following statements about adhesion is true?
Which of the following statements about adhesion is true?
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Which of the following is a property of water due to strong hydrogen bonding?
Which of the following is a property of water due to strong hydrogen bonding?
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Water is denser as a solid than it is as a liquid.
Water is denser as a solid than it is as a liquid.
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Which of the following is not one of the four important properties of water?
Which of the following is not one of the four important properties of water?
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Match the following concepts with their descriptions:
Match the following concepts with their descriptions:
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What does the term 'adhesion' refer to in the context of water?
What does the term 'adhesion' refer to in the context of water?
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Match the following terms with their definitions:
Match the following terms with their definitions:
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Water is tasteless and odorless in its pure form.
Water is tasteless and odorless in its pure form.
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What phrase describes the affinity of water to dissolve polar substances?
What phrase describes the affinity of water to dissolve polar substances?
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Water is __________ dense as a solid than as a liquid.
Water is __________ dense as a solid than as a liquid.
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Match the water property with its description:
Match the water property with its description:
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Name one application of hydrogen bonding in biological systems.
Name one application of hydrogen bonding in biological systems.
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Study Notes
Properties of Water
- Water exhibits adhesion, allowing it to stick to other substances, which aids in transporting water in plants through the xylem, helping to move it from roots to leaves.
- High specific heat indicates that water can absorb significant amounts of heat without a drastic temperature change, stabilizing conditions for organisms and aiding in maintaining homeostasis.
- Cohesion refers to the attraction between water molecules due to hydrogen bonds, contributing to water's surface tension and enabling water droplets to maintain shape.
- Water is less dense as a solid (ice), which is unusual for substances, allowing ice to float and insulate aquatic environments.
- Water is a universal solvent, dissolving many substances due to its polar nature; polar solvents dissolve polar solutes, adhering to the principle "like dissolves like."
- Water accounts for 70% to 95% of living organisms, with human body composition being approximately 70% water; brain cells contain 85% water, while bone cells contain 20%.
- Water's unique properties, governed by hydrogen bonding, are essential for sustaining life on Earth.
- Hydrogen bonds involve attractions between slightly positive hydrogen atoms and slightly negative atoms, driving many of water's characteristics.
Importance of Hydrogen Bonds in Water
- Universal solvent ability ensures that water can facilitate various chemical reactions in biological systems.
- High specific heat capacity stabilizes temperatures, benefiting organisms by providing a consistent thermal environment.
- High heat of vaporization provides cooling effects upon evaporation, crucial for thermoregulation in living beings.
- Lubrication and cushioning of organs enhance protection, showcasing water's role as a transport and reaction medium.
Indicators and Applications
- pH indicators such as cabbage extract and litmus papers can assess acidity or alkalinity.
- Applications of hydrogen bonding in biological systems includes its roles in enzyme activity, DNA structure stabilization, and cellular transport mechanisms.
Summary of Water's Characteristics
- Water is tasteless and odorless, appearing blue against a white background, due to its unique molecular structure with one oxygen and two hydrogen atoms at a 104.5° bond angle.
- Each water molecule can form up to four hydrogen bonds, significantly affecting its properties as a solvent and a physical substance.
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Description
Test your understanding of the unique properties of water, including adhesion, cohesion, and specific heat. This quiz focuses on how these properties affect plant life and water's behavior in various contexts. Ideal for students studying biology or environmental science.
