Ammonia Acid Worksheet With Answers Page 22
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49(d)
Indigestion tablets can be made from magnesium oxide. The magnesium oxide neutralises
some of the hydrochloric acid in the stomach.
Draw a ring around the name of the salt formed when magnesium oxide reacts with
hydrochloric acid.
magnesium chloride
magnesium hydroxide
magnesium sulfate
(1)
(Total 4 marks)
Q19.
Read the article and then answer the questions that follow.
Hydrogen fuel for cars?
Hydrogen is an excellent fuel. It can be made by the electrolysis of potassium
hydroxide solution.
Hydrogen gas can be stored under pressure in a cylinder but a leak of the gas
could cause an explosion.
It has been found that lithium nitride can absorb and then release large volumes of
hydrogen. A chemical reaction takes place between the hydrogen and the lithium
nitride. The hydrogen is held in the resulting compounds by chemical bonds.
The problem is that the rate at which hydrogen is absorbed and then released
from normal sized particles of lithium nitride is slow.
Recently scientists have made ‘nanosized’ particles of lithium nitride. These
particles absorb hydrogen in the same way as normal sized lithium nitride
particles. The ‘nanosized’ particles have the advantage that they absorb and
release the hydrogen much faster when needed in the fuel cell.
It is hoped that ‘nanosized’ particles of lithium nitride may provide a safe method
of storing hydrogen in the future.
(a)
Hydrogen is produced at the negative electrode during the electrolysis of potassium
hydroxide solution.
(i)
Why are hydrogen ions attracted to the negative electrode?
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(1)
Page 22 of 49
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