Covalent substances can be simple molecular covalent or giant covalent - Edexcel - GCSE Chemistry - Question 8 - 2018 - Paper 1
Question 8
Covalent substances can be simple molecular covalent or giant covalent.
(a) (i) Ammonia is a simple molecular, covalent substance.
Which is the most likely set of p... show full transcript
Worked Solution & Example Answer:Covalent substances can be simple molecular covalent or giant covalent - Edexcel - GCSE Chemistry - Question 8 - 2018 - Paper 1
Step 1
Which is the most likely set of properties for ammonia?
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Answer
The most likely set of properties for ammonia (NH₃) is option B:
Melting point: -78 °C
Boiling point: -33 °C
Ability to conduct electricity in liquid state: does not conduct
Ammonia is a simple molecular substance, which typically shows low melting and boiling points due to weak intermolecular forces. Additionally, it does not conduct electricity in the liquid state as it does not have free ions.
Step 2
Write the balanced equation for this reaction.
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Answer
The balanced equation for the reaction of nitrogen with hydrogen to form ammonia (NH₃) is:
N2+3H2→2NH3
In this reaction, one molecule of nitrogen reacts with three molecules of hydrogen to produce two molecules of ammonia.
