All About Chemical Bonding
Exploring chemical bonding in 3 stages:

Covalent bonding

Ionic bonding

Metallic bonding

Why does bonding occur?
After watching the introductory Why does bonding occur?segment, complete the following questions.

  1. What was the name of the American chemist who believed the electrons in the outer shell of an atom are the key to chemical bonding?
  2. Briefly describe the ‘Octet Rule.’
  3. Why are noble gases the most chemically unreactive of all the elements?
  4. Using your understanding of the ‘Octet Rule’ and valence shells, explain what happens during a chemical reaction.

The structure of atoms
After watching the introductory The structure of atoms segment, complete the following questions.

  1. Draw and label a basic diagram of the structure of an atom, including the correct number of shells.
  2. Explain this formula: Electrons = 2n2
  3. Briefly describe ‘quantum mechanics’.

Part 1: Ionic Bonding

After viewing All About Chemical Bonding: Ionic, complete the following questions.

  1. What is electronegativity?
  2. Which three elements have the highest electronegativity?
  3. What is the Pauling Scale used for?
  4. What is ionisation energy?
  5. Draw and label a diagram of the lattice structure of ionic bonds.
  6. Explain why most ionic substances are hard and have high melting points.
  7. Why don’t solid ionic compounds conduct electricity?

/ RESEARCH:
NaCl (table salt) is an example of a commonplace ionic compound. Research three more examples of common ionic compounds and diagrammatically represent their structure.

Part 2: Metallic Bonding

After viewing All About Chemical Bonding: Metallic, complete the following questions.

  1. List the properties of metallic solids, which make them notably different to ionic solids.
  2. What is meant by the ‘sea’ of delocalised electrons?
  3. Draw a diagram of each of the following geometric arrangement of metal cations. Briefly describe each arrangement.

Body-centred cubic arrangement

Face-centred cubic arrangement

Hexagonal close-packing

/ RESEARCH:
Choose a metallic substance which you see everyday. Conduct in-depth research on the substance, referring to its structure, reactivity and special properties.

Part 3: Covalent Bonding

After viewing All About Chemical Bonding: Covalent, complete the following questions.

  1. When do covalent bonds occur?
  2. Draw an example of a Lewis diagram, and name the molecule it represents.
  3. What is Valence Shell Electron Pair Repulsion (VSEPR)?
  4. Why are molecular substances poor conductors of electricity?
  5. Define the following:
    Dipole interactions:
  6. Dispersion forces:

List two examples of carbon covalent network solids.

/ RESEARCH:
Find out as much as you can about the ‘bucky ball’ (buckminsterfullerene). Consider how and when it was discovered and in which substances it can be found.