Pengelasan sebatian mineralMetal oxideMetal carbonateMetal sulphide

Gabungan metal dengan oxygen --> membentuk metal oxide

Gabungan metal dengan carbon and oxygen --> metal carbonate

Gabungan metal dengan sulphur --> metal sulphide

1 The diagram shows an experiment to investigate the reaction between pieces of egg shell and dilute sulphuric acid.

What are the products of the reaction?A Calcium oxide + carbon dioxideB Calcium carbonate + carbon dioxideC Calcium sulphate + carbon dioxide + waterD Calcium hydroxide + carbon dioxide + water

PMR 2004

C

5 Diagram 18 shows the apparatus set-up to investigate the properties of compound Q. The gas released turns the lime water chalky.What is compound Q?

A Copper oxide

B Lead sulphide

C Silicon dioxide.

D Calcium carbonate.

PMR 2008

D

Paper 2Panas = oksigen

(a) (i) What can you observe happening to the iron filings during the reaction?

(ii) Give one reason for your observation in (a) (i)

Iron filling burn very brightly.

Iron filings react with oxygen.

(b) Write the word equation for the reaction.

(c) The iron filings in the experiment is then replaced with copper powder. Write the word equation for the reaction.

+

+

Iron Oxygen Iron oxide

Copper Oxygen Copper oxide

Calcium carbonate

W

Diagram 3 shows the apparatus set-up to study the effect of heat on calcium carbonate. (PMR 2007)

Diagram 3(i) What is liquid W?

Lime water

CaCO3

(ii) What can be observed happening to liquid W at the end of this experiment?

Complete the word equation for this reaction.

Calcium Carbonate Heated +

Lime water/Liquid W turns chalky

Calcium oxide

Carbon dioxide

observed

CaCO3CaO

CO2

•What conclusion can be made from this study?

•Suggest how slaked lime can be formed from pieces of sea shells.

Calcium carbonate when heated releases carbon dioxide that turns the lime water chalky.

By heating the sea shell strongly and then pour few drops of water to it.