5.5 Complete the following sentences:
5.5.1 A substance that change colour in the presence of an acid or base ___________ (1)
5.5.2 Bromothymol blue turns ___________in acids and turns ___________ in alkalis. (1)
5.5.3 Red litmus paper turns ___________in a basic media. (0.5)
5.5.4 Blue litmus paper turns ___________in an acid media. (0.5)
5.5.5 Rice grows best in ___________ soil. (1)
5.5 Complete the following sentences: 5.5.1 A substance that change colour in the presence of an...
QUESTION 5 [20] 5.1 What does pH measure? (1) 5.2 Differentiate between an acid and a base in terms of their pH values. (2) 5.3 Identify salts, acids and bases applied in the following: 5.3.1 Used as an electrolyte in lead-car batteries (1) 5.3.2 Used as a cleaning agent (1) 5.3.3 Used in drain and oven cleaners (1) 5.3.4 Used in antacids to relieve indigestion (1) 5.4 Complete the following table for bases and acids by giving the answers for...
SECTION B – CHEMISTRY [40] QUESTION 4 [20] 4.1 Briefly define the following terms: 4.1.1 Nucleus (1) 4.1.2 Nucleons (1) 4.1.3 Neutrons (1) 4.2 Deuterium and tritium both have the same number of protons and electrons. What makes them different? (2) 4.3 Complete symbol contain the symbol of the element, the mass number and the atomic number. Give the complete symbols of Bromide and Bromine. (3) 4.4 Draw the atomic structure of the following element: 4.4.1 H (1) 4.4.2 He...