Which two of the following substances dissolve in water to form alkaline solutions?
This question is about sodium hydroxide and sulphuric acid and the reaction between them. Which two of the statements are correct?
The diagram shows part of an oil rig. Unprotected iron (steel) will corrode (rust) if it is in contact with oxygen and water.
6.1 The iron (steel) will be protected from rusting if the metal of the attached blocks is:
6.2 Stainless steel is a non-rusting alloy of iron. Stainless steel is an alloy of iron, nickel, and:
Aluminium does not corrode as quickly as iron (steel) because:
The compound formed on the surface of the copper when it is weathered is:
The diagram shows how pure copper can be obtained from impure copper. 8.1 A suitable metal salt would be:
8.2 Which of the following statements describes what happens at the positive electrode?
8.2 Which of the following statements describes what happens at the negative electrode?
The reaction at the negative electrode is:
Which salt is produced in this reaction? Ammonia solution + nitric acid → ............................ + water
When the ammonia solution is completely neutralised by the nitric acid solution, the reaction can be written as:
Which of these substances will react with nitric acid to produce the salt, copper nitrate?
