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?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The most likely set of properties for ammonia is option B:
Melting point: -78 °C
Boiling point: -33 °C
Ability to conduct electricity: does not conduct
This is consistent with the properties of simple molecular covalent substances, which typically have low melting and boiling points and do not conduct electricity in liquid state due to the absence of free ions.
Step 2
Write the balanced equation for this reaction.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The balanced equation for the formation of ammonia from nitrogen and hydrogen is:
ightarrow 2NH_3$$
This equation shows that one molecule of nitrogen gas reacts with three molecules of hydrogen gas to produce two molecules of ammonia.
