Year 9 2009 Exam

Question 8: During this topic you reacted many chemicals. Complete the following table.
Name of the Reactants Name of ONE Product ONE observation for each reaction
Magnesium and oxygen
Magnesium and
hydrochloric acid
Baking soda and
vinegar
Question 9: Acids and Bases and the pH scale.
(a) Count the number of atoms in the following molecules.
KCl ___________ Na 2 CO 3 ___________ MgCl 2 ______________ _________
(b) Litmus paper, Universal test paper and universal indicator are used to tell us the pH of a
solution. Complete the following table writing in the colour the paper / indicator would turn for
the solutions given.
Solution Red Litmus Blue Litmus UTP/Universal indicator
Tap water
acid
Base
Question 10: The picture below shows a jelly. In making the jelly there is a solvent, solute and a
solution. Name each:
Solvent:
Solute:
Solution:
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