Foundation tier papers may include questions in which you have to complete a sentence. Some of these questions include words to choose from in a box. You do not have to use all the words - some of them will be wrong.
This page contains AQA material which is reproduced by permission of AQA.
Crude oil is a mixture of many different carbon compounds.
Crude oil can be separated into useful fractions by fractional distillation.
The image shows a column used to separate crude oil.
Use words from the box to complete the sentences. [2 marks]
Crude oil is heated so that most of the compounds ______.
At different temperatures the compounds cool and ______.
Crude oil is heated so that most of the compounds evaporate.
At different temperatures the compounds cool and condense.
Use the correct word from the box to complete the sentence. [1 mark]
|cross links||a giant ionic lattice||strong covalent bonds|
Graphite has a high melting point because graphite has ______.
Graphite has a high melting point because graphite has strong covalent bonds.