Chemistry past questions

(a) What is an electrochemical cell?

(b) State three differences between an electrochemical cell and an electrolytic cell.

(c) Explain briefly what would be observed when powdered zinc is added to a solution of copper (II) tetraoxosulphate (IV) in a beaker.

d(i) Write an equation for the reaction in 1(c);

 (ii) State the type of reaction which took place in 1(c);

(e) Name two gases which should be prepared in a fume chamber.

(f) Give three factors that favour cracking.

(g) Give the reason why noble gases are chemically inert.

(h) State four properties of a homologous series.

(i) What is global warming?

(j)State one cause of global warming.

Which of the following gases could be collected by downward displacement of air?

Which of the following substances has the lowest boiling point?

The branch of science that deals with the nature and properties of substances and how one substance can be converted to another is known as 

The electron configuration 1S² 2S² 2P_x² contravenes the 

The oxidation number of Chromium in Na₂Cr₂O₇  is