If you have any question on chem p6 im ready you guys. Don't Worry!!

IGCSE O/L student

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noura_elsaadany said:
Okii Here In O/N 2011 PaPER 62 !! ...
First Question .. In The BoX the Answer Is Water .. ! Why It's Not Ethanol ?
AND also Part (b) In q.1 --- The Answer Is ( Magnesium Oxide ) .. WHY ??
Click to expand...
coz hydrogen is produced, wen water reacts wid magnesium, hydrogen bubbles out, n magnesiumoxide is formed
 
thats_me

thats_me

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noura_elsaadany said:
Okii Here In O/N 2011 PaPER 62 !! ...
First Question .. In The BoX the Answer Is Water .. ! Why It's Not Ethanol ?
AND also Part (b) In q.1 --- The Answer Is ( Magnesium Oxide ) .. WHY ??
Click to expand...
well as it says "wet" mineral wool ,, y will it b ethanol?? :S
magnesiun oxide as Mg + H2O --->MgO + H2
 
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RaneemI said:
Hi,

I was solving paper 6 chem and they always show up a weird question which i cant solve for eg
http://78.159.163.147:9204/745DAE5D9EDEB1E7A1B57B0B168EC3E065736BAB9C566660E1ED69CED16C8D922FEA3C825D2A2F4F108EF9A00/www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_62.pdf
Q5d
How am i supposed to know what happens with the lighted splint ??
The same type of question in s11_61
Can u please help me & explain
Many thanks :)
Click to expand...
usin a lighted splint is a test 4 hydrogen. if hydrogen is present, u'll hear a pop sound.
it is also used 2 idenify certain metals n non-metals
in dis ppr, i think da liquid contains carbon
in da other ppr, da solid identified is sodium or phosphorus
 
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sulphur-bryt blue flame
phosphorus-yellow flame
carbon-glows red
sodium-yellow flame
magnesium-bryt white
calcium-red flame
iron-burns wid yellow sparks
copper-does not burn, turns black
 
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RaneemI

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IGCSE O/L student said:
usin a lighted splint is a test 4 hydrogen. if hydrogen is present, u'll hear a pop sound.
it is also used 2 idenify certain metals n non-metals
in dis ppr, i think da liquid contains carbon
in da other ppr, da solid identified is sodium or phosphorus
Click to expand...
Yup the liquid is organic fuel but can u share any link or document stating these test cause its not written in my book or notess
Thank U :)
 
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Legendary3li

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Step 1:
Fill a burette with dilute acid to zero mark.
Step 2:
Put 25 cm
3 of dilute sodium hydroxide into a conical flask with a pipette.
Step 3:
Add few drops of a suitable indicator such as universal indicator.
Step 4:
Run the acid from the burette into the flask of alkali until one or more drop of acid is enough to turn the indicator from violet to green.
Step 5:
The volume of acid used to neutralize the 25 cm
3 of alkali is noted. E.g. 23 cm3 of HCl
Step 6:
The process is repeated with the volume noted for the acid and the same volume of alkali used, but without the indicator.
Step 7:
Evapourate most of the water from the solution using a hot water bath in a crystallizing dish.
Let the solution cool and crystallize out. Filter the crystals on a filter paper and dry them.

That's titration in order to get crystals of sodium chloride
 
Ami

Ami

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Legendary3li said:
Step 1:
Fill a burette with dilute acid to zero mark.
Step 2:
Put 25 cm
3 of dilute sodium hydroxide into a conical flask with a pipette.
Step 3:
Add few drops of a suitable indicator such as universal indicator.
Step 4:
Run the acid from the burette into the flask of alkali until one or more drop of acid is enough to turn the indicator from violet to green.
Step 5:
The volume of acid used to neutralize the 25 cm
3 of alkali is noted. E.g. 23 cm3 of HCl
Step 6:
The process is repeated with the volume noted for the acid and the same volume of alkali used, but without the indicator.
Step 7:
Evapourate most of the water from the solution using a hot water bath in a crystallizing dish.
Let the solution cool and crystallize out. Filter the crystals on a filter paper and dry them.

That's titration in order to get crystals of sodium chloride
Click to expand...


Thank youuu every much~:) good luck on your exam~(y)
 
Razo513

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thats_me said:
ummm but CO2 is not a base :S
Click to expand...
all what ik is that solubility of C02 is not proportional to temp u can read it off google ... i remember that all bases solubility decrease with temp .. didnt focus much on the question ... wait perhaps u get another reply.. SRRY COULDNT HELP U MUCH
 
thats_me

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Razo513 said:
all what ik is that solubility of C02 is not proportional to temp u can read it off google ... i remember that all bases solubility decrease with temp .. didnt focus much on the question ... wait perhaps u get another reply.. SRRY COULDNT HELP U MUCH
Click to expand...
ohh okayee thx & np .. well i had another doubt is mass inversely propotional to temperature rise??
 
Hamzeh S

Hamzeh S

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When drawing smooth line graph is it ok if i left a point ? because sometimes some questions ask which point is inaccurate
 
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