OCR A Combined Science Chemistry C2: Bonding

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Questions and Answers

What is the primary force holding atoms together in a covalent bond?

  • Electrostatic attraction (correct)
  • Nuclear fusion
  • Van der Waals forces
  • Gravitational force

What is the shape of a molecule with a trigonal planar arrangement of electron pairs?

  • Linear
  • Trigonal planar (correct)
  • Tetrahedral
  • Trigonal bipyramidal

Which of the following types of bonds is typically found in metals?

  • Metallic bonds (correct)
  • Ionic bonds
  • Electrovalent bonds
  • Covalent bonds

What is the correct order of increasing bond strength?

<p>Hydrogen bond, covalent bond, ionic bond (A)</p> Signup and view all the answers

What type of bond is formed when a highly electronegative atom, such as oxygen, bonds with a less electronegative atom, such as hydrogen?

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

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Study Notes

Covalent Bonds

  • The primary force holding atoms together in a covalent bond is the sharing of one or more pairs of electrons.

Molecular Shapes

  • A molecule with a trigonal planar arrangement of electron pairs has a shape resembling a triangle, with all atoms in a single plane.

Metallic Bonds

  • Metallic bonds are typically found in metals, where electrons are delocalized and free to move throughout the metal lattice.

Bond Strength

  • The correct order of increasing bond strength is: ionic < polar covalent < nonpolar covalent.

Electronegative Bonds

  • When a highly electronegative atom, such as oxygen, bonds with a less electronegative atom, such as hydrogen, a polar covalent bond is formed.

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