SECTION B ESSAY
1 hour [60 marks] Answer three questions only from this section.
Illustrate your answers wherever possible, with large, clear and fully labelled diagrams. Credit will be given for clarity of expression and orderly presentation of material.
All questions carry equal marks
1.(a)(i)Define density of a substance
(ii)Explain how the density of a stone could be determined
(b)A box with a volume of1000 m3 is filled with sand to the brim.If the density of sand is 2 kgm-3, calculate the mass of sand in the box.
(c) Copy and complete the table below:
|Vibrio cholera||Cholera||Eatinghot food|
(d) Name theme thod which could be used to separate each of the following mixtures into their components:
(i) Alcohol and water
(ii) Salt and water
(iii) Powdered charcoal and iron filings
(iv) Powdered chalk and water
2.(a)(i) (ii)Name the process by which green plants manufacture their food. State three factors necessary for this process to take place.
(b)(i) Mention the device which could be used to carry a heavy body onto a truck.
(ii) Name four simple levers used in everyday life.
(iii) Draw a lever and label the pivot, effort and load on it
(c)(i)Using any ammonium compound, describe the general preparation of ammonia gas. (Diagram of apparatus is not required)
(ii)Write the chemical equation for the preparation
3.(a) A sample of garden soil is put in a cylinder containing water.It is shaken and allowed to settle.
Draw and label the layers formed.
(b) (i) Name four types of forces.
(ii) A boy used a catapult to pluck a mango from a tree. State two forces involved in this
(iii) Where are the forces in (b) (ii) applied?
(c) Describe an experiment to show that there is change in heat energy when a new substance is
4. (a) (i) Mention the three states of matter.
(ii) State the two methods by which one state can be converted to another.
(b) A bag of cement is pulled along a smooth horizontal floor with a horizontal force of 1000 N.If the work done is 100,000 J, calculate the distance through which the bag is pulled.
(c) (i) Draw the side view of a bony fish and label the parts.
(ii) Explain how the fish takes in oxygen.
(iii) For each of the following animals name two parts which help it to live in its environment
(β) Fish CLICK TO VIEW ANSWERS TO PART 2