Here are the topics you need to study for Chemistry Paper 6

[khaledMokhtar]

-colours
- insoluble substances
-seperation of mixtures
-acids and base
-preperation of salts
-C.R.S
-redox
-electrolysis
-non metals
-test for ions
-rate of reaction
-Organic(Fermentation and preperation of ethene ONLY)

I also have got some predictions of the expirement that might come, may post them later .
Hope you all do well :good: GOOD LUCK ! :lol:

 

[TheCookieMonster]

Re: Here are the topics you need to study for Chemistry Pape

Thx but what's C.R.S? and what's ur prediction for the experiment? And how is ethene made? by the cracking of long-chain alkanes?

 

[khaledMokhtar]

Re: Here are the topics you need to study for Chemistry Pape

C.R.S= Chemical reactivity series
Ethene is made by cracking as you said
Predictions will be posted immedietly.

 

[khaledMokhtar]

Re: Here are the topics you need to study for Chemistry Pape

Example 1 : A general purpose cleaner is made up as follows:
foaming agent 10 %
ammonia 5%
bleaching agent 12%
Binding agent 10%
Detergent 19
insoluble substances 44%
Outline with expiremental methods how would you show that the cleaner contains 44% insoluble mterials
Ans: Weigh 100g of cleaner using balance
Transfer sample to a beaker
add 50 cm^2 of distilled water using measuring cylinder
Stirr the mix using glass rod
Filter the mixture
wash and dry and weigh residue
mass of residue obtained will be 44g


Example 2:A farmer needs to test and compare the acidity of two samples of soil.Outlinw how the farmer should carry out the tests?
Ans: Weigh 2 samples of different soils using blance
crush each sample
transfer each sample to a beaker
add equal amount of distillef water to each sample
filter the mixture
add universal indicator to each filtrate from each sample
observe colour change ( If red>Strong If orange>Weak


Example 3 : Concrete is made of cement, sand and small stones. Outline an expirment to find out the compostion of a sample of concrete .
Ans: Weigh 5o gr of concrete
Add excess hcl to the sample
stirr the mixture
filture the mixture
sands and stones are optained as a residue
Caco3 due to the reaction with acid forms CaCl2 which is obtained as a filtrate.


Example 4:Make a plan to coat a copper ring with gold ( Electroplating, It's simple)
You need to draw the electroplating device first, (Cathode=Cu ring, Anode= Au)
then you must mention : Clean Cu ring with sand paper to remove impurities
Dissolve AuNo3 crystals in distilled water to make Aq AuNo3
Connect as shown ( Diagram)
Afer some time the red colur of the Cu ring will turn into yellow


Example 5: You are provided with a measuring cylinder, a beaker , a thermometer, Spirit burner, balance, fuel, stand, copper can
Plan an expirment to investigate wich alcohol, methanol or ethanol, produces more energy?
Ans= Weigh two spirit burner of the same mass
put each one under a copper can
add the same volume of water to each can
Suspend thermometer in each metal can and measure the initial temp
burn each fuel for a minute
record rise in temp in each case
Thermometer which record higher temp indicates the better fuel .


Example 6 : Plan an expirement you could do to prove that there is only two yellow substances are present in a lemon drink ( or equivalent)
Ans= CHROMOTOGRAPHY( Simple and easy)


* I hope this helps, Good luck all :wink: