SECTION A1- A4 CHEMISTRY

Which of the following techniques or processes may be used to separate a mixture of plant pigments into individual components?

• Fractional distillation.

• Solvent extraction

• Paper chromatography

• Centrifugation

Which of the following apparatus/ instruments is most suitable for obtaining both cooking oil and water from a mixture of the two?

• Filter funnel

• Separating funnel

• Fractionating column

• Volumetric flask

A separating funnel can be used to separate a mixture of

• water and sodium chloride

• water and ethanol

• water and kerosene

• kerosene and solid sodium chloride

A substance X, with boiling point of 58°C, is miscible with another liquid Y, of boiling point 94°C. A mixture of these two liquids can BEST be separated into its components by

• fractional distillation

• simple distillation

• use of a separating funnel

• sublimation

Which of the following statements illustrates osmosis?

• Pollen dust in random motion in water

• Movement of perfume molecules through the air in a room

• Movement of water molecules across a cellophane membrane into a concentrated glucose solution

• Movement of food colouring molecules in a dilute aqueous solution

Which of the following processes provides evidence in support of the particulate nature of matter?

• Diffusion

• Precipitation

• Condensation

• Filtration

In descending Group VII of the periodic table, which TWO of the following trends occur?  

I. The density of the elements increases.    

II. The relative atomic mass of the elements decreases.  

III. The melting point of the elements increases.  

IV. The reactivity of the elements increases.

• I and III

• I and IV

• II and III

• II and IV

Radioactive isotopes are NOT normally used in the

• determination of the age of fossils

• treatment of cancer

• treatment of influenza

• powering of certain types of submarines

Which of the following elements has SEVEN in its outer shell?

• Hydrogen

• Oxygen

• Nitrogen

• Chlorine

Which of the following processes provide evidence of the particulate nature of matter?    

I. Diffusion.

 II. Filtration.

III. Osmosis.

• I and II only

• I and III only

• II and III only

• I, II and III