ST. FRANCIS SECONDARY SCHOOL HALF YEARLY …

ST. FRANCIS SECONDARY SCHOOL

HALF YEARLY EXAMINATION ? SPECIMEN PAPER

. FORM 3

CHEMISTRY

TIME: 2 HOURS

Name:

Total Mark from 90:

? A copy of the periodic table is provided during the exam. ? You are reminded of the necessity for good English and orderly

presentation in your answers. In calculations you are advised to show all the steps in your working. ? Electronic Calculators may be used in any part of the examination. ? Useful Data:

? STP conditions are to be taken as 0?C and 760mmHg

Section A: Answer ALL Questions in this section. This section carries 50 marks

? This question is about Separation Techniques (Total: 7 marks) Experimental techniques used to separate mixtures include:

? Chromatography ? Evaporation (Crystallisation) ? Sublimation ? Filtration ? Distillation ? Fractional Distillation ? Separating Funnel Give the letter of the most suitable process for: ? Obtaining crystals of sodium chloride from sodium chloride

solution.............. ? Separating a solid precipitate from the liquid in which it has been

produced............. ? The separation of a solute and a solvent while keeping both the solute and

the solvent.............. ? Separating two immiscible liquids such as oil and water...................... ? Finding what coloured substances are present in flower

petals..................... ? Separating iodine from solid carbon..................

? Separating two miscible liquids with different boiling points such as alcohol and water................

(1 mark each)

? This question is about Atomic Structure and the Periodic table (Total: 19 marks)

? Use the periodic table to give the name and symbol of:

Name

Symbol

? ? A Non-Metal which is not a Halogen ? A Transition Metal ? An Inert Gas ? An Alkaline Earth Metal

? Give the electronic configurations of:

(4 marks)

? Argon ? Sodium ? Chlorine

(3 marks)

? There are three different atoms of Magnesium, namely;

Complete the following statements:

? These atoms are all ? There are

of magnesium. neutrons in an atom of . (2 marks)

? Complete the following table:

Mass Number Atomic Number Number of Protons Number of Electrons Number of Neutrons

(10 marks)

? This question is about Kinetic Theory and States of Matter (Total: 11 marks)

? What happens to the molecules of a solid when the solid melts to form a liquid?

(2 marks) ? What happens to the molecules of a liquid when the liquid boils to form

a gas?

(2 marks)

?

A tube

is set up, as shown in the diagram below, with ammonia gas given

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