1. State uses of sulphuric acid in daily life.
- lead acid batteries in automobiles and for home use
- extraction of elements from ores
- manufacturing of fertilizers
2.The following shows an incomplete flow chart of the Contact process. a)
3. Briefly explain the sources of sulphuric dioxide gas in atmosphere. -Sulphur dioxide is produced mainly from the combustion of fossil fuels that contain Sulphur , such as coal and oil.
4. State two effect of sulphuric dioxide on the environment. -Sulphur dioxide can cause acid rain that seriously affects ecosystems -can form secondary particles (sulphates) that cause haze and reduce visibility.
9.2 Manufacture of Ammonia and its salts
1. State uses of ammonia in daily life.
-To make explosive chemicals such as TNT
-In the rubber industry, ammonia is used to prevent the cogalation of latef
2. State physical properties of ammonia.
-Ammonia,(NH₃) is a colourless and pinyentgas
-It is less dense than air
-It is highly soluble in water.
NH₃ + H₂O NH₄OH
3.The diagram below show ]s a flow chart to prepare nitric acid and fertiliser Z from ammonia.
Process A Process B
a) Name the process A
b) Write the chemical equation to represent the formation of ammonia in process A -
c) Name the process B
d) What is the catalyst used in process B?
e)Write the chemical of fertiliser Z?
4 Ammonia is a valuable source in the manufacture of ammonium fertilisers. a) State one example of ammonium fertiliser
b) Suggest an acid used to produce the fertiliser stated in a. -
c) Write a chemical equation to represent the formation of fertiliser in a. -
1. Using suitable illustrations, explain why metals are ductile and malleable. -Can be draw into long wires
-Can be hammered to from any shape.
2. State the meaning of alloy
-Alloys are materials that contain more than one element .Usually, alloys are mixtures of metallic elements – two or more metals.
3. List composition, properties and uses of alloys.
Alloys | Composition| Properties| Uses|
Alnico| Fe, Al, Ni, Co| Strongly magnetic| Permanent magnets| Constantan| Cu, Ni| High resistance| Thermocouple|
Copper-nickel| Cu, Ni| Hard, shining and lasting| Coins| Brass| Cu, Zn| Doesn’t corrode easily | Ship boilers| Bronze| Cu, Sn| Very hard and strong| Ship propellers|
Duralumin| Al, Cu, Mn, Mg| Strong and light| Aircraft bodies|
4. a) Draw the arrangement of atoms in:
i) pure iron ii)steel
a) Based on the drawing, explain why steel alloy is harder than pure iron. -
5. The body of LRT train is made of alloy Q.
a) Name two element in alloy Q
b)What the properties of alloy Q that make it suitable to construct the body of LRT train? -Strong, hard and light
6. The table below shows the composition of two alloys.
Alloy P| Tin, copper, antimony|
Brass alloy| Substance Q , substance R|
a) Name alloy P
b) Name the substances Q and R
c) State two uses of brass alloy
- Ship boilers
9.4 Synthetic Polymers.
1. What is a polymer?
- Polymers are large molecules a made up of identical sub-units of monomers which are joined together by covalent bonds.
2. Give two examples of natural polymers and their respective monomers -Fat in cell...