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Questions and Answers

Which type of molecule is likely to dissolve easily in water?

  • Polar molecules (correct)
  • Ionic compounds
  • Non-polar molecules
  • Amphipathic molecules
  • What is the main feature of amphipathic molecules?

  • They can form hydrogen bonds only with themselves.
  • They are completely non-polar.
  • They contain both polar and non-polar groups. (correct)
  • They repel water completely.
  • Why can non-polar molecules not dissolve in water?

  • They form strong ionic bonds.
  • They cannot form hydrogen bonds with water. (correct)
  • They are repelled by polar molecules.
  • They react vigorously with water.
  • What type of bonds are hydrogen bonds classified as?

    <p>Non-covalent bonds</p> Signup and view all the answers

    What must a hydrogen atom be involved in for hydrogen bonding to occur?

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

    What type of bond exists between the hydrogen and oxygen atoms in a water molecule?

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

    What is the bond angle in a water molecule?

    <p>104.5 degrees</p> Signup and view all the answers

    What charge does the oxygen atom in a water molecule carry?

    <p>Partial negative charge</p> Signup and view all the answers

    How many hydrogen bonds can one water molecule form with neighboring water molecules?

    <p>4</p> Signup and view all the answers

    At what temperature does ice melt into water?

    <p>0 degrees Celsius</p> Signup and view all the answers

    What happens to hydrogen bonds in water as temperature increases?

    <p>They begin to break</p> Signup and view all the answers

    Why is water referred to as the universal solvent?

    <p>Its dipolar structure allows it to interact with various solutes</p> Signup and view all the answers

    How do water molecules interact with water-soluble ionic compounds like NaCl?

    <p>They create hydration shells around ions</p> Signup and view all the answers

    What is the primary focus of biochemistry?

    <p>Understanding how chemical structures contribute to biological processes</p> Signup and view all the answers

    What determines the stability of a chemical compound?

    <p>The strength of the bonds between its constituents</p> Signup and view all the answers

    What characterizes covalent bonds?

    <p>They involve the sharing of electrons between atoms</p> Signup and view all the answers

    Which term describes bonds where electrons are shared unequally?

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

    What is a characteristic of polar molecules like water?

    <p>They have regions of partial positive and negative charge</p> Signup and view all the answers

    Which of the following is true regarding the energy required to break covalent bonds?

    <p>Considerable energy must be expended to break them</p> Signup and view all the answers

    What type of covalent bond involves the sharing of three pairs of electrons?

    <p>Triple bond</p> Signup and view all the answers

    What defines non-covalent bonds?

    <p>They arise from electrostatic interactions</p> Signup and view all the answers

    What drives nonpolar molecules together in an aqueous environment?

    <p>Strong hydrogen bonding among water molecules</p> Signup and view all the answers

    What is the consequence of molecules approaching each other beyond the Van der Waals distance?

    <p>Development of repulsive forces</p> Signup and view all the answers

    Which structure in cells relies on hydrophobic interactions?

    <p>Phospholipid bilayer membranes</p> Signup and view all the answers

    What role do transient dipoles play in molecular interactions?

    <p>They induce complementary asymmetry in nearby atoms</p> Signup and view all the answers

    What is a characteristic of nonpolar molecules in relation to water?

    <p>They tend to cluster together in water</p> Signup and view all the answers

    Which of the following contributes to water's biological importance?

    <p>Unique molecular structure that supports life</p> Signup and view all the answers

    What type of bond forms between the hydrogen and oxygen atoms in water?

    <p>Covalent bond</p> Signup and view all the answers

    Which atom in a water molecule has a stronger attraction for electrons?

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

    What defines a non-polar covalent bond?

    <p>Electrons are equally shared between atoms of the same electronegativity.</p> Signup and view all the answers

    Which type of bond involves the sharing of electron pairs where both electrons come from one atom?

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

    Which of the following is NOT a characteristic of non-covalent bonds?

    <p>They are stronger than covalent bonds.</p> Signup and view all the answers

    What feature is essential for hydrogen bonding to occur?

    <p>A hydrogen atom must be bonded to an electronegative atom.</p> Signup and view all the answers

    What phenomenon explains the attraction between temporary dipoles in Van der Waals forces?

    <p>Transient electrostatic interactions due to fluctuating electron distributions</p> Signup and view all the answers

    Which of the following represents an ionic bond?

    <p>Attraction between NH3+ and COO- ions</p> Signup and view all the answers

    What is the contribution of hydrogen bonds in the structure of DNA?

    <p>They bond the nitrogenous bases across strands, stabilizing the double helix.</p> Signup and view all the answers

    Which of the following is a correct description of the hydrogen donor and acceptor in hydrogen bonds?

    <p>The donor is the electronegative atom where hydrogen is attached.</p> Signup and view all the answers

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