Kimia Bab 9

Only available on StudyMode
  • Download(s) : 581
  • Published : January 23, 2011
Open Document
Text Preview
9.1 Manufacture of Sulphuric Acid

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)

b)Chemical equation
A.
B.
C.
D.

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.

Ammonia
Ammonia
Fertiliser Z
Fertiliser Z
Nitric acid
Nitric acid
Hydrogen
Hydrogen
Nitrogen
Nitrogen

Process A Process B
+H₂SO₄

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
-Ammonium nitrate

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. -

9.3 Alloys

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
-Aluminium
-Magnesium

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| Composition|
Alloy P| Tin, copper, antimony|
Brass alloy| Substance Q , substance R|

a) Name alloy P
-Pewter

b) Name the substances Q and R
Q: Copper
R: Zinc

c) State two uses of brass alloy
- Ship boilers
-Ship propellers

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...
tracking img