The Importance of Water in Biology
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Questions and Answers

What makes water a polar molecule?

  • The greater electronegativity of the oxygen atom (correct)
  • The greater electronegativity of the hydrogen atoms
  • The lack of electronegativity in the water molecule
  • The equal electronegativity of the oxygen and hydrogen atoms

    • What is responsible for the surface tension of water?

  • Cohesion due to hydrogen bonding (correct)
  • The lack of electronegativity in the water molecule
  • The presence of oxygen and hydrogen atoms
  • Adhesion to other substances

    • Why does water rise in a narrow glass tube when lowered into a beaker of water?

  • Adhesion to the glass surface (correct)
  • The force of gravity pulling it downward
  • Lack of gravity in the glass tube
  • Cohesion due to hydrogen bonding

    • What characteristic of water allows insects to glide atop the surface instead of sinking?

    <p>High surface tension</p> Signup and view all the answers

    What is responsible for the polarity of the water molecule?

    <p>The electronegativity of the oxygen atom</p> Signup and view all the answers

    What causes water to adhere to any substance with which it can form hydrogen bonds?

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

    What is the primary reason for the high surface tension of water?

    <p>The cohesion of water molecules</p> Signup and view all the answers

    Why do insects glide atop the surface of water instead of sinking?

    <p>The high surface tension of water due to hydrogen bonding</p> Signup and view all the answers

    What causes the water to rise in a narrow glass tube when lowered into a beaker of water?

    <p>The adhesion of water to the glass surface, drawing it upward</p> Signup and view all the answers

    What characteristic of the water molecule makes it attracted to other polar molecules?

    <p>The electronegativity of the oxygen atom</p> Signup and view all the answers

    What is the primary reason for the cohesive property of water?

    <p>The electronegativity of the oxygen atom in the water molecule</p> Signup and view all the answers

    Why does an insect glide atop the surface of water instead of sinking?

    <p>The high surface tension of water</p> Signup and view all the answers

    What causes the water to rise in a narrow glass tube above the level of the water in a beaker?

    <p>The adhesive property of water to glass</p> Signup and view all the answers

    What characteristic of water allows it to be attracted to other polar molecules?

    <p>The electronegativity of the oxygen atom in the water molecule</p> Signup and view all the answers

    What is responsible for the high surface tension of water?

    <p>The electronegativity of the oxygen atom in the water molecule</p> Signup and view all the answers

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