The Periodic Table of Elements
9 Which graph shows the number of electrons in the outer shell of an atom, plotted against the proton (atomic) number for the first ten elements in the Periodic Table?
10 The equation for the reaction between copper and nitric acid is shown.
vCu + wHNO3 → xCu(NO3)2 + yNO + zH2O
v, w, x, y and z are whole numbers.
Which values of v, w, x, y and z balance the equation
11 An aqueous solution of compound X reacts with aqueous sodium hydroxide to form a green precipitate and then aluminium powder is added. The mixture is heated and a gas that turns damp red litmus paper blue is given off.
What is X?
A ammonium nitrate
B copper(II) chloride
C iron(II) nitrate
D iron(III) chloride
12 Which of the following reagents could be used to distinguish between dilute nitric acid and dilute hydrochloric acid?
A aqueous barium chloride
B copper(II) carbonate
C aqueous silver nitrate
D aqueous sodium hydroxide
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