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CR Biology A M1L6
40 Questions
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CR Biology A M1L6

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@CarefreeMeerkat

Questions and Answers

What characterizes a water molecule's polarity?

  • Oxygen has a slightly negative charge. (correct)
  • Hydrogen has no charge.
  • Hydrogen has a stronger attraction for electrons than oxygen.
  • Oxygen has a slightly positive charge.

    • What type of bond forms between adjacent water molecules?

  • Metallic bond
  • Hydrogen bond (correct)
  • Ionic bond
  • Covalent bond

    • Which property of water allows it to move against gravity in plants?

  • Cohesion
  • Density
  • Capillary action (correct)
  • Evaporation

    • What happens to water molecules when ice forms?

    <p>They expand.</p> Signup and view all the answers

    Which process uses water as a reactant to produce glucose and oxygen?

    <p>Photosynthesis</p> Signup and view all the answers

    Why is water important for biochemical reactions in living organisms?

    <p>It can dissolve many substances.</p> Signup and view all the answers

    What effect do hydrogen bonds have on water's boiling point?

    <p>They raise the boiling point.</p> Signup and view all the answers

    What is the term for water molecules sticking to each other?

    <p>Cohesion</p> Signup and view all the answers

    How does water's lower density as ice benefit aquatic life in cold climates?

    <p>It supports a stable ecosystem below the ice.</p> Signup and view all the answers

    Which ion gets stabilized by water molecules after an ionic bond breaks?

    <p>Na+</p> Signup and view all the answers

    What is another name for dihydrogen monoxide?

    <p>Water</p> Signup and view all the answers

    What percentage of Earth's water is freshwater?

    <p>3%</p> Signup and view all the answers

    What unique property of water allows light to pass through it?

    <p>Transparency</p> Signup and view all the answers

    Which of the following states of water is NOT commonly found on Earth?

    <p>Plasma</p> Signup and view all the answers

    Why is water considered vital for all living organisms?

    <p>It regulates temperature</p> Signup and view all the answers

    What is the primary reason Earth is referred to as the 'water planet'?

    <p>Water is abundant and vital for life</p> Signup and view all the answers

    Which property of water helps organisms to survive in aquatic environments?

    <p>Low density as a solid</p> Signup and view all the answers

    Which process is NOT directly influenced by the properties of water?

    <p>Protein synthesis</p> Signup and view all the answers

    What is the primary component of Earth’s water, accounting for most of its volume?

    <p>Saltwater oceans</p> Signup and view all the answers

    Which aspect of water's chemical structure contributes to its unique properties?

    <p>The arrangement of hydrogen and oxygen atoms</p> Signup and view all the answers

    The oxygen atom in a water molecule has a slightly positive charge.

    <p>False</p> Signup and view all the answers

    Cohesion refers to the bonding of a water molecule to another substance.

    <p>False</p> Signup and view all the answers

    Water expands when it freezes, which causes ice to have a higher density than liquid water.

    <p>False</p> Signup and view all the answers

    Transpiration is the process through which water is used as a reactant to produce glucose and oxygen.

    <p>False</p> Signup and view all the answers

    Hydrogen bonds are weaker than covalent bonds but are abundant in water, contributing to its unique properties.

    <p>True</p> Signup and view all the answers

    Water is composed of five atoms, including two hydrogen atoms and one oxygen atom.

    <p>False</p> Signup and view all the answers

    Most of the freshwater on Earth is found in rivers and lakes.

    <p>False</p> Signup and view all the answers

    Water experiences the same properties in all three of its states: liquid, solid, and gas.

    <p>False</p> Signup and view all the answers

    Earth is often referred to as the 'water planet' because nearly 75% of its surface is covered with water.

    <p>True</p> Signup and view all the answers

    Iguassu Falls is the smallest series of waterfalls on the planet.

    <p>False</p> Signup and view all the answers

    Match the following properties of water with their descriptions:

    <p>Cohesion = Molecules sticking to each other Adhesion = Molecules bonding to another substance Capillary action = Liquid's ability to flow against gravity High boiling point = Temperature at which water remains liquid</p> Signup and view all the answers

    Match the following biological processes with the role of water in them:

    <p>Photosynthesis = Water is a reactant Cellular respiration = Water is a product Transpiration = Movement of water in plants Dissolving substances = Facilitating biochemical reactions</p> Signup and view all the answers

    Match the following terms related to water with their definitions:

    <p>Hydrogen bonds = Weak attractions between water molecules Polarity = Uneven distribution of electrical charge Electrons = Negatively charged particles around atoms Density = Mass per unit volume of a substance</p> Signup and view all the answers

    Match the following components of a water molecule to their quantities:

    <p>Oxygen = 1 atom Hydrogen = 2 atoms Water = H2O Ionic bonds in salt = Sodium (Na+) and Chloride (Cl-)</p> Signup and view all the answers

    Match the following effects of hydrogen bonds in water with their outcomes:

    <p>Expands when frozen = Lower density than liquid water High boiling point = Water remains liquid at high temperatures Cohesion in droplets = Water forms drops instead of separating Stabilizes ions = Enhances dissolution of salts like NaCl</p> Signup and view all the answers

    Match the following states of water with their descriptions:

    <p>Liquid = Water’s most common state on Earth Solid = The state of water known as ice Gas = Water vapor that fills the atmosphere Freshwater = Water suitable for drinking and irrigation</p> Signup and view all the answers

    Match the properties of water with their significance:

    <p>Tasteless and odorless = Enhances its suitability for various life forms Transparent = Allows sunlight to penetrate for aquatic photosynthesis High specific heat = Regulates temperature in living organisms Cohesion = Enables water to travel against gravity in plants</p> Signup and view all the answers

    Match the following locations to their water types:

    <p>Oceans = Contains the majority of Earth's saltwater Glaciers = The largest reservoir of freshwater Rivers = Flowing bodies of freshwater Atmosphere = Houses water vapor</p> Signup and view all the answers

    Match the following terms associated with water to their definitions:

    <p>Hydrogen bonding = Attractive force between water molecules Polarity = Distribution of electrical charge across a water molecule Surface tension = A cohesive force that allows some insects to walk on water Aquatic photosynthesis = Process that uses light to convert carbon dioxide and water into glucose</p> Signup and view all the answers

    Match the following facts about water to their significance:

    <p>Water is vital to life = All known forms of life depend on it Earth is a water planet = 75% of its surface is covered by water Water's unique properties = Help explain its role in living organisms Life originated in water = Indicates the importance of aquatic environments for early life forms</p> Signup and view all the answers

    Study Notes

    Importance of Water

    • Dihydrogen oxide, commonly known as water, is crucial for all known forms of life.
    • Life originated in water, which is essential for biological processes.
    • Earth is referred to as the "water planet," with nearly 75% of its surface covered by water.

    Water's Distribution on Earth

    • Most of Earth's water is saltwater found in oceans.
    • Freshwater, constituting a smaller percentage, is primarily located in glaciers, ice caps, and underground aquifers.

    Chemical Structure of Water

    • Each water molecule consists of one oxygen atom and two hydrogen atoms (H2O).
    • Water is a polar molecule, with slightly negative charge on the oxygen and slightly positive charges on the hydrogen atoms.

    Unique Properties of Water

    • Hydrogen bonds form between water molecules due to polarity, leading to characteristics such as cohesion and adhesion.
    • Cohesion is the attraction between water molecules, evident in the way water forms droplets.
    • Adhesion is the attraction of water molecules to other substances, which leads to capillary action, essential for plant water transport.

    Physical Properties of Water

    • Water remains liquid over a wide temperature range, with a boiling point of 100°C (212°F).
    • Hydrogen bonds cause water to expand upon freezing, making ice less dense than liquid water, allowing it to float.

    Water and Biological Functions

    • The human body contains about 70% water, essential for normal functioning.
    • Water is vital for biochemical reactions, including:
      • Photosynthesis: Water is a reactant that helps convert sunlight, carbon dioxide, and water into glucose and oxygen.
        • Equation: 6CO2 + 6H2O + Energy → C6H12O6 + 6O2
      • Cellular respiration: Water is a product when glucose is broken down in the presence of oxygen.
        • Equation: C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy

    Conclusion

    • Water's properties and its role in biochemical processes highlight its irreplaceability in supporting life on Earth.

    Importance of Water

    • Dihydrogen oxide, commonly known as water, is crucial for all known forms of life.
    • Life originated in water, which is essential for biological processes.
    • Earth is referred to as the "water planet," with nearly 75% of its surface covered by water.

    Water's Distribution on Earth

    • Most of Earth's water is saltwater found in oceans.
    • Freshwater, constituting a smaller percentage, is primarily located in glaciers, ice caps, and underground aquifers.

    Chemical Structure of Water

    • Each water molecule consists of one oxygen atom and two hydrogen atoms (H2O).
    • Water is a polar molecule, with slightly negative charge on the oxygen and slightly positive charges on the hydrogen atoms.

    Unique Properties of Water

    • Hydrogen bonds form between water molecules due to polarity, leading to characteristics such as cohesion and adhesion.
    • Cohesion is the attraction between water molecules, evident in the way water forms droplets.
    • Adhesion is the attraction of water molecules to other substances, which leads to capillary action, essential for plant water transport.

    Physical Properties of Water

    • Water remains liquid over a wide temperature range, with a boiling point of 100°C (212°F).
    • Hydrogen bonds cause water to expand upon freezing, making ice less dense than liquid water, allowing it to float.

    Water and Biological Functions

    • The human body contains about 70% water, essential for normal functioning.
    • Water is vital for biochemical reactions, including:
      • Photosynthesis: Water is a reactant that helps convert sunlight, carbon dioxide, and water into glucose and oxygen.
        • Equation: 6CO2 + 6H2O + Energy → C6H12O6 + 6O2
      • Cellular respiration: Water is a product when glucose is broken down in the presence of oxygen.
        • Equation: C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy

    Conclusion

    • Water's properties and its role in biochemical processes highlight its irreplaceability in supporting life on Earth.

    Importance of Water

    • Dihydrogen oxide, commonly known as water, is crucial for all known forms of life.
    • Life originated in water, which is essential for biological processes.
    • Earth is referred to as the "water planet," with nearly 75% of its surface covered by water.

    Water's Distribution on Earth

    • Most of Earth's water is saltwater found in oceans.
    • Freshwater, constituting a smaller percentage, is primarily located in glaciers, ice caps, and underground aquifers.

    Chemical Structure of Water

    • Each water molecule consists of one oxygen atom and two hydrogen atoms (H2O).
    • Water is a polar molecule, with slightly negative charge on the oxygen and slightly positive charges on the hydrogen atoms.

    Unique Properties of Water

    • Hydrogen bonds form between water molecules due to polarity, leading to characteristics such as cohesion and adhesion.
    • Cohesion is the attraction between water molecules, evident in the way water forms droplets.
    • Adhesion is the attraction of water molecules to other substances, which leads to capillary action, essential for plant water transport.

    Physical Properties of Water

    • Water remains liquid over a wide temperature range, with a boiling point of 100°C (212°F).
    • Hydrogen bonds cause water to expand upon freezing, making ice less dense than liquid water, allowing it to float.

    Water and Biological Functions

    • The human body contains about 70% water, essential for normal functioning.
    • Water is vital for biochemical reactions, including:
      • Photosynthesis: Water is a reactant that helps convert sunlight, carbon dioxide, and water into glucose and oxygen.
        • Equation: 6CO2 + 6H2O + Energy → C6H12O6 + 6O2
      • Cellular respiration: Water is a product when glucose is broken down in the presence of oxygen.
        • Equation: C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy

    Conclusion

    • Water's properties and its role in biochemical processes highlight its irreplaceability in supporting life on Earth.

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    Description

    Explore the vital role of water in sustaining life on Earth and its unique chemical structure. Understand the distribution of water on our planet and learn about properties such as cohesion and adhesion that make water essential for biological processes.

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