Using models to explain state changes | Combined science

Starter quiz

Below, there are six different models for representing the bonding and structure in the compound ethane. Match the image to the correct type of model.
- a
  
  ⇔
  
  dot-and-cross diagram ✓
- b
  
  ⇔
  
  molecular formula ✓
- c
  
  ⇔
  
  ball-and-stick model ✓
- d
  
  ⇔
  
  empirical formula ✓
- e
  
  ⇔
  
  displayed formula ✓
- f
  
  ⇔
  
  space-filling model ✓
What do the dots and crosses typically represent in dot-and-cross diagrams?
- 'electrons' ✓
Which of the following are limitations of the empirical formula when representing molecules?
- it does not show the types of bonds ✓
- it does not indicate the actual number of atoms ✓
- it does not provide any spatial information ✓
- it serves as a step towards determining the molecular formula
Which model would not be appropriate to represent the bonding and/or structure in metals?
- ball-and-stick
- space-filling
- dot-and-cross ✓
- delocalised "sea" of electrons
What advantage does the ball-and-stick model have over the space-filling model?
- It shows the actual size of atoms more accurately.
- It clearly shows which atoms/ions have bonded. ✓
- It is easier to see the overall shape of the substance.
- It is more accurate in depicting electron sharing.
Which representation is most suitable for illustrating the arrangement of ions in a giant ionic lattice?
- molecular formula
- ball-and-stick model ✓
- displayed formula
- empirical formula