KCSE CHEMISTRY QUESTIONS AND ANSWERS PER TOPIC
Give one example of elements A and B
A B
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Oxygen and sulphur belong to group (VI) of the periodic table. Explain why there is a big difference their (melting points of oxygen is –2160C while that of sulphur is 440C.
ANSWER
Name One property of neon that makes it possible to be used in electric lamps
ANSWERS
The table below gives information on four elements by letters K, L, M and N. Study it and answer the questions that follow. The letters do not represent the actual symbols of the elements. a) Which two elements have two similar properties? Explain (2mks) Give a reason why calcium hydroxide solution is used to detect the presence of carbon dioxide gas while sodium hydroxide in NOT?
Expected Response
Ca (OH)2(aq) forms white precipitate (1/2) with CO2 Can be observed NaOH(1/2)(aq) does not form a precipitate. (1mk) KCSE PAST PAPERS: CHEMISTRY FORM 2 TOPICAL QUESTIONS AND ANSWERSQUESTIONS
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