Chemistry Paper 61 Post your Doubts And General Tip's

[Muaaz Iqbal]

Well you just do not have to study Much in chemistry paper 06
All you need to Learn is
> Identification of ion's
> Solubility of salt's
> Methods of Preparing Salts
> The particle theory
> The Reactivity Series
> Test for Gases
*Most Importantly Colours*
And you should have a concept of Electrolysis
Once you're done with all that Just do maximum Pastpapers,
Remember "Hard Work Always Pays"
Chemistry isn't that Hard Just you have to Clear your Concept's
Best of Luck to everyone

 

[Raduwan]

Does anyone have the 2015 igcse papers ( any paper is fine), if u have it please give it to me at [email protected], I need it urgently please!!! :'(

 

[Mr.Physics]

Does anyone have the 2015 igcse papers ( any paper is fine), if u have it please give it to me at [email protected], I need it urgently please!!! :'(

WTF man why are you asking for papers everywhere ?? No one has got them !! The time that you spent on writing this could have helped you if you utilised it for studying !!

 

[sj0007]

Well you just do not have to study Much in chemistry paper 06
All you need to Learn is
> Identification of ion's
> Solubility of salt's
> Methods of Preparing Salts
> The particle theory
> The Reactivity Series
> Test for Gases
*Most Importantly Colours*
And you should have a concept of Electrolysis
Once you're done with all that Just do maximum Pastpapers,
Remember "Hard Work Always Pays"
Chemistry isn't that Hard Just you have to Clear your Concept's
Best of Luck to everyone

This is a really good summary! Thnx...................

 

[UsamaFTW]

Anyone has a paper with all the chemical colours on it? i could really use on right now. thanks

 

[loaie Amgad]

guys paper 6 is one of the easiest papers in igcse just u need to work hard on past papers cuz I dont think so that new papers are different from old ones .....
Good Luck to everyone.....

 

[Mr.Physics]

guys paper 6 is one of the easiest papers in igcse just u need to work hard on past papers cuz I dont think so that new papers are different from old ones .....
Good Luck to everyone.....

Hey how to make two intersecting straight lines in a graph in chemistry p6 ??

 

[thepantcoat]

Yo are all acids colourless in our portion that we need to know?
And also it would be a HUGE help if someone gave a list of the different colours different compounds or elments form

 

[thepantcoat]

Also can anyone tell the list of instruments we need to know for p6? i didnt know about the gas jar until i did a past paper. any unusual ones we need to know?

 

[loaie Amgad]

Hey how to make two intersecting straight lines in a graph in chemistry p6 ??

well , I think thats an easy question . You just need to figure out which points that make up the first line and which that make up the second line and extend them until they meet together to form intersection .....
Hope you get it.....

 

[Mr.Physics]

well , I think thats an easy question . You just need to figure out which points that make up the first line and which that make up the second line and extend them until they meet together to form intersection .....
Hope you get it.....

Ok Thx !!

 

[lakshya raj dugar]

Does anyone have the 2015 igcse papers ( any paper is fine), if u have it please give it to me at [email protected], I need it urgently please!!! :'(

i have them but won't give as i am lazy

 

[RRRRRRRR]

good luck everyone!

 

[Muaaz Iqbal]

good luck everyone!

u to I'm Way too scared

 

[Muaaz Iqbal]

Best of luck Everyone
Pray for me

 

[XxChampXx]

Good luck to everyone

 

[Reem15]

good luck everyone!! <3

 

[FAHAD imtiaz]

Tips for Chemistry ATP (both IGCSE and O-level):

Some precautions:
=> Experiments involving poisonous gases like Nitrogen DIOXIDE, Ammonia and Bromine -> Carry out the exp. in Fume Cupboard or in a well Ventilated Room.
=> Experiments involving heat -> Use a polystyrene cup for insulation to prevent heat loss! + Always take the same initial readings for better accuracy;
=> Experiments involving Acids, Liquids or Solids -> Always use the same concentration; Same Volumes; Same Surface Area or Same Masses exceptions are some variables!
=> Experiment involving Crystallisation -> Allow to cool SLOWLY and Use more water and more salt for better results!
SOME COMMON and USEFUL precautions for all experiments (use these when your mind is BLANK)
=> Repetition of the exp.
=>Taking Average > Put your tie in shorts
=> Use Goggles
=> Taking measurements carefully and multiple measurements , to achieve accuracy ( by finding the average )
=> When drawing the best fit line in a graph , do not include points that seem to be out of the curve ,use a sharp and make the curve as smooth as possible , and remember to plot the independent Variable ( Temprature in a Time-of-reaction ( Y ) / Temprature ( X ) graph ) and NEVER forget to write the labels.

Tests
1.For Water:
> By adding anhydrous Copper(II) Sulphate , which will turn from white to blue.
> By adding anhydrous Cobalt(II) chloride , which will turn from blue to pink.

2.For unsaturated hydrocarbon ( Alkenes )
>Liquid : By adding Bromine water to it and shaking. (it'l go from Brown to colourless)
>Gas : By passing the compound through Bromine water. (Colour change = Brown to colourless)

3.For purity of substance
Solids => Test for melting point , if it is the correct value ( like the data says ) it is pure , if not, it is impure. e.g. Ice at 0 C°
Liquids => Test for boiling point , if it is the correct value ( like the data says ) it is pure , if not, it is impure. e.g. Water at 100 C°

COLLECTION TECHNIQUES:
=> upward delivery is for -> gases less dense than air (Hydrogen and Ammonia)
=> Downward delivery is for -> gases more dense than air (Carbon Dioxide
=> Displacement of water method -> insoluble gases ( Methane )


Fermentation:
=> Glucose and Yeast are used! (just rememeber that Yeat contains enzymes -> Biological Catalysts)
=> Suitable Temperature 37 degrees (Optimum for Enzyme)
=> Bung is used -> To Let Carbon Dioxide out, and prevent the entry of Oxygen.
=> Why is Oxygen's entry prevented (-> because it'l oxidize the alcohol to Carboxylic Acid and also it'l affect the anaerobic respiration)
=> Why does the reaction stop? -> Due to an excess in the conc. of alcohol, Yeast dies. Or Glucose finishes up!

Chromatography:
=> Draw a baseline with a pencil (pencil being insoluble) about 1-2 cm above the end of the chromatogram
=> Use a pipette to put a concentrated spot of dye on the paper
=> Dip it in a solvent (Water, if it's soluble in it otherwise an organic solvent e.g Ethanol)
=> the solvent level MUST be below the baseline
=> The solvent would start to rise up the paper producing a no. of spots (depending on the no. of dyes present in the substance)
=> Spray a locating agent for colourless dyes like amino acids or simple sugars
=> Or identify with RF value (formula = (distance moved by the dye)/(distance moved by the solvent)

Oxidising Agents!
=> KMn04 (V11) -> FROM PURPLE TO COLOURLESS!
=> K2Cr2O7 (VI) -> From Orange to Green!

=> All metals are reducing agents! (Mention the Group I metals, when asked)
=> Dehydrating Agents : Sulfuring Acid
=> Drying agent : Calcium Oxide


Ethene test: Add bromine water and bromine water will go colourless with alkenes (ethene) and it will remain orange for alkanes (ethane)

For precautions .. Tie your hair at the back .. Wear gloves .. Lab suit !

Universal Indicators:
Acid ( Red - Yellow) , Neutral ( Green) , Alkaline ( Blue - Violet)
Phenolphthalein: Alkaline ( Pink) For Strong ( Colourless) , Neutral ( Colourless) , Acid ( Orange)
Methyl Orange: Alkaline: ( Yellow) , Neutral ( Colourless) , Acid ( Red)
Bromothymol Blue: Acid (Yellow) , Neutral (Dark green) , Alkaline (Blue)

Here's a link to another great thread about ATP tips: https://www.xtremepapers.com/community/threads/chemistry-atp-tips.25439/

Correct me where I'm wrong and also post your own tips, I will add them to my post.
Remember me in your prayers and good luck.

 

[ThePacifics]

hi great tips! Thanks!

Tips for Chemistry ATP (both IGCSE and O-level):

Some precautions:
=> Experiments involving poisonous gases like Nitrogen DIOXIDE, Ammonia and Bromine -> Carry out the exp. in Fume Cupboard or in a well Ventilated Room.
=> Experiments involving heat -> Use a polystyrene cup for insulation to prevent heat loss! + Always take the same initial readings for better accuracy;
=> Experiments involving Acids, Liquids or Solids -> Always use the same concentration; Same Volumes; Same Surface Area or Same Masses exceptions are some variables!
=> Experiment involving Crystallisation -> Allow to cool SLOWLY and Use more water and more salt for better results!
SOME COMMON and USEFUL precautions for all experiments (use these when your mind is BLANK)
=> Repetition of the exp.
=>Taking Average > Put your tie in shorts
=> Use Goggles
=> Taking measurements carefully and multiple measurements , to achieve accuracy ( by finding the average )
=> When drawing the best fit line in a graph , do not include points that seem to be out of the curve ,use a sharp and make the curve as smooth as possible , and remember to plot the independent Variable ( Temprature in a Time-of-reaction ( Y ) / Temprature ( X ) graph ) and NEVER forget to write the labels.

Tests
1.For Water:
> By adding anhydrous Copper(II) Sulphate , which will turn from white to blue.
> By adding anhydrous Cobalt(II) chloride , which will turn from blue to pink.

2.For unsaturated hydrocarbon ( Alkenes )
>Liquid : By adding Bromine water to it and shaking. (it'l go from Brown to colourless)
>Gas : By passing the compound through Bromine water. (Colour change = Brown to colourless)

3.For purity of substance
Solids => Test for melting point , if it is the correct value ( like the data says ) it is pure , if not, it is impure. e.g. Ice at 0 C°
Liquids => Test for boiling point , if it is the correct value ( like the data says ) it is pure , if not, it is impure. e.g. Water at 100 C°

COLLECTION TECHNIQUES:
=> upward delivery is for -> gases less dense than air (Hydrogen and Ammonia)
=> Downward delivery is for -> gases more dense than air (Carbon Dioxide
=> Displacement of water method -> insoluble gases ( Methane )


Fermentation:
=> Glucose and Yeast are used! (just rememeber that Yeat contains enzymes -> Biological Catalysts)
=> Suitable Temperature 37 degrees (Optimum for Enzyme)
=> Bung is used -> To Let Carbon Dioxide out, and prevent the entry of Oxygen.
=> Why is Oxygen's entry prevented (-> because it'l oxidize the alcohol to Carboxylic Acid and also it'l affect the anaerobic respiration)
=> Why does the reaction stop? -> Due to an excess in the conc. of alcohol, Yeast dies. Or Glucose finishes up!

Chromatography:
=> Draw a baseline with a pencil (pencil being insoluble) about 1-2 cm above the end of the chromatogram
=> Use a pipette to put a concentrated spot of dye on the paper
=> Dip it in a solvent (Water, if it's soluble in it otherwise an organic solvent e.g Ethanol)
=> the solvent level MUST be below the baseline
=> The solvent would start to rise up the paper producing a no. of spots (depending on the no. of dyes present in the substance)
=> Spray a locating agent for colourless dyes like amino acids or simple sugars
=> Or identify with RF value (formula = (distance moved by the dye)/(distance moved by the solvent)

Oxidising Agents!
=> KMn04 (V11) -> FROM PURPLE TO COLOURLESS!
=> K2Cr2O7 (VI) -> From Orange to Green!

=> All metals are reducing agents! (Mention the Group I metals, when asked)
=> Dehydrating Agents : Sulfuring Acid
=> Drying agent : Calcium Oxide


Ethene test: Add bromine water and bromine water will go colourless with alkenes (ethene) and it will remain orange for alkanes (ethane)

For precautions .. Tie your hair at the back .. Wear gloves .. Lab suit !

Universal Indicators:
Acid ( Red - Yellow) , Neutral ( Green) , Alkaline ( Blue - Violet)
Phenolphthalein: Alkaline ( Pink) For Strong ( Colourless) , Neutral ( Colourless) , Acid ( Orange)
Methyl Orange: Alkaline: ( Yellow) , Neutral ( Colourless) , Acid ( Red)
Bromothymol Blue: Acid (Yellow) , Neutral (Dark green) , Alkaline (Blue)

Here's a link to another great thread about ATP tips: https://www.xtremepapers.com/community/threads/chemistry-atp-tips.25439/

Correct me where I'm wrong and also post your own tips, I will add them to my post.
Remember me in your prayers and good luck.

But in the IGCSE Chemistry Coursebook by Richard hardwood the colours for the indicators are slightly different.

Phenolphthalein :-
Acid- Colourless
Neutral- Colourless
Alkaline- Pink

Methyl orange :-
Acid- Red
Neutral- Orange
Alkaline- Yellow

 

[Muaaz Iqbal]

hi great tips! Thanks!


But in the IGCSE Chemistry Coursebook by Richard hardwood the colours for the indicators are slightly different.

Phenolphthalein :-
Acid- Colourless
Neutral- Colourless
Alkaline- Pink

Methyl orange :-
Acid- Red
Neutral- Orange
Alkaline- Yellow

Both are Correct