MEDIUM
MYP:4-5
IMPORTANT
Earn 100
Seawater has a very high concentration of dissolved sodium chloride. Suggest why it is unsafe to swim in the ocean during an electric storm.
Important Questions on What are the Impacts of Chemical Industry?
MEDIUM
MYP:4-5
IMPORTANT
Outline, why calamine solution (which contains zinc carbonate) is effective for relieving pain from bee stings (which contains methanoic acid).
MEDIUM
MYP:4-5
IMPORTANT
Outline, why milk of magnesia (which contains magnesium hydroxide) is given to people suffering from heart burn, a pain caused by their acidic stomach contents, (which contain hydrochloric acid) backing up into their oesophagus.
MEDIUM
MYP:4-5
IMPORTANT
Outline, why quicklime (calcium oxide), slaked lime (calcium hydroxide) and chalk (calcium carbonate) can all be used to improve soil that are too acidic to be useful for agriculture.
MEDIUM
MYP:4-5
IMPORTANT
Five solutions at the same temperature and with the same concentrations, sucrose (table sugar), nitric acid, ammonia solution, sodium hydroxide and methanoic acid, were tested with universal indicator. Suggest which of these solutions should be matched to each pH measurements listed in the table, and information about the properties of these substances that guided your identifications.
| pH value | Identity of the solution | Property of the substance in solution |
MEDIUM
MYP:4-5
IMPORTANT
Of the solution of sucrose (table salt), nitric acid, ammonia, sodium hydroxide, suggest a pair of combination that could be mixed to give neutral solution. Explain your thinking.
MEDIUM
MYP:4-5
IMPORTANT
Describe what you expect to observe, and the movement of electrons between the reactants, when a piece of magnesium is added to dilute sulphuric acid.
MEDIUM
MYP:4-5
IMPORTANT
Describe what you expect to observe, and the movement of electrons between the reactants, when an iron nail is added to dilute nitric acid.
MEDIUM
MYP:4-5
IMPORTANT
Describe what you expect to observe, and the movement of electrons between the reactants, when aluminium is added to dilute hydrochloric acid.
