Properties of Water and pH Concepts
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Questions and Answers

What is adhesion?

  • Water molecules cling to the side of a beaker (correct)
  • Water molecules are electrically attracted to each other
  • A drop of water spilled on a table forms a drop on the table
  • Water molecules are attracted to each other

    • What is cohesion?

  • A sewing needle floats when placed on water
  • The polarity of water molecules
  • Water molecules cling to the side of a beaker
  • Water molecules are attracted to each other (correct)

    • What is surface tension?

  • Water molecules cling to plant cell walls
  • A sewing needle floats on water (correct)
  • A drop of water spreads out on a surface
  • An acid increases hydrogen ion concentration

    • What is indicated by the arrow in a chemical diagram referring to a hydrogen ion?

    <p>Hydrogen ion (H+)</p> Signup and view all the answers

    What is indicated by the arrow in a chemical diagram referring to a hydroxide ion?

    <p>Hydroxide ion (OH-)</p> Signup and view all the answers

    In a neutral solution, what is the relationship between hydrogen ions and hydroxide ions?

    <p>Their concentrations are equal.</p> Signup and view all the answers

    How does the pH of the solution on the right compare with that of the solution on the left?

    <p>The solution on the right is basic.</p> Signup and view all the answers

    What type of weak bonds allow water molecules to be electrically attracted to each other?

    <p>Hydrogen bonds</p> Signup and view all the answers

    What property results from water molecules being electrically attracted to each other?

    <p>Cohesion and other emergent properties</p> Signup and view all the answers

    What is the amount of energy required to change the temperature of 1 g of liquid water by 1 °C?

    <p>1 calorie</p> Signup and view all the answers

    What is the useful quality of water that helps organisms resist rapid temperature changes?

    <p>High specific heat</p> Signup and view all the answers

    What is the best term to describe a mixture of sugar, flavorings, and carbon dioxide dissolved in water?

    <p>An aqueous solution</p> Signup and view all the answers

    What does an acid do in an aqueous solution?

    <p>Increases hydrogen ion concentration</p> Signup and view all the answers

    How many times more acidic is a pH of 6 compared to a pH of 9?

    <p>1,000</p> Signup and view all the answers

    What is the best description of a buffer?

    <p>A buffer accepts and donates hydrogen ions</p> Signup and view all the answers

    What causes most acid precipitation?

    <p>Sulfur oxides and nitrogen oxides</p> Signup and view all the answers

    How many other water molecules is each water molecule joined to, and by what type of bonds?

    <p>Four, hydrogen bonds</p> Signup and view all the answers

    What characteristic does the unequal sharing of electrons within a water molecule create?

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

    What is the term for an atom's tendency to pull electrons toward itself?

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

    What type of bond is found between oxygen and hydrogens in a water molecule?

    <p>Polar covalent bond</p> Signup and view all the answers

    Why isn't an insect drowning when it stands on water?

    <p>Surface tension</p> Signup and view all the answers

    What is the name given to the molecule created when a water molecule gains a hydrogen ion?

    <p>Hydronium ion</p> Signup and view all the answers

    How does a hydroxide ion form?

    <p>From the dissociation of a water molecule</p> Signup and view all the answers

    What type of ion is represented by a hydroxide ion?

    <p>Hydroxide ion</p> Signup and view all the answers

    What is the correct equation for the dissociation of water?

    <p>H2O + H2O ↔ H3O+ + OH-</p> Signup and view all the answers

    What is the charge on a hydronium ion?

    <p>+1</p> Signup and view all the answers

    What is the charge on a hydroxide ion?

    <p>-1</p> Signup and view all the answers

    Study Notes

    Properties of Water

    • Adhesion: Water molecules adhere to surfaces like beaker walls and plant cell walls, enabling capillary action.
    • Cohesion: Water molecules attract one another, causing water drops to maintain a spherical shape rather than spreading out.

    Water Behavior

    • Surface Tension: Water's surface can support light objects, illustrated by a water strider moving on a pond without breaking the surface and a sewing needle floating when placed gently on water.

    Ions and pH

    • Hydrogen Ion (H+): A single proton representing the basic unit of acidity in solutions.
    • Hydroxide Ion (OH-): Formed when water dissociates, it signifies basicity.
    • Neutral Solutions: Have equal concentrations of hydrogen ions and hydroxide ions.

    pH Levels

    • Acidity Comparison: A pH of 6 is 1,000 times more acidic than a pH of 9.
    • Basicity: Solutions with lower hydrogen ion concentrations compared to hydroxide ions are considered basic.

    Molecular Characteristics

    • Polarity of Water: Water has a positive and negative pole, which allows for hydrogen bonding between water molecules and with other polar molecules.
    • Hydrogen Bonds: Weak bonds formed between the oxygen of one water molecule and the hydrogen of another lead to unique properties such as cohesion and high specific heat.

    Thermal Properties

    • Specific Heat: Water can absorb or release a large amount of heat with minimal temperature change, facilitating stable temperatures in organisms.
    • Heat of Vaporization: Water's high heat of vaporization allows it to remain in liquid form across a broad range of temperatures.

    Solutions

    • Aqueous Solution: Mixtures where substances like sugars and flavorings are dissolved in water, exemplifying water’s role as a solvent.
    • Acids: Substances increasing hydrogen ion concentration in solutions.

    Buffer Systems

    • Buffer Function: Buffers maintain pH stability by accepting excess hydrogen ions and donating them when depleted, playing critical roles in biological systems.

    Environmental Factors

    • Acid Precipitation: Resulting from sulfur oxides and nitrogen oxides reacting with water in the atmosphere, contributing to acid rain.

    Water Molecule Structure

    • Molecule Bonds: Each water molecule forms four hydrogen bonds with other water molecules.
    • Electronegativity: The tendency of an atom (like oxygen in water) to attract electrons, influencing molecular interactions.

    Additional Ion Information

    • Dissociation of Water: The equation for water dissociation is H2O + H2O ↔ H3O+ + OH-, signifying the formation of hydronium and hydroxide ions.
    • Charges of Ions: Hydronium ions have a charge of +1, while hydroxide ions have a charge of -1.

    Surface Phenomena and Animal Adaptations

    • Surface Tension: Prevents small insects from drowning, allowing them to walk on water surfaces due to cohesive forces among water molecules.

    Ion Nomenclature

    • Hydronium Ion: Formed when a water molecule gains a hydrogen ion from another water molecule.
    • Hydroxide Ion: Represents the negatively charged counterpart in the water dissociation process.

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    Description

    Explore the essential properties of water, including adhesion and cohesion, along with its unique behavior such as surface tension. Understand the significance of hydrogen and hydroxide ions in determining pH levels and how acidity and basicity are compared through pH values.

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