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Physics, Chemistry and Biology: Post your doubts here!

thats_me

thats_me

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Abu mota said:
nobody answers my questions :(
but mayb this time someone might so in oct/nov 2006 i dont understand why is question 8 is C
and also question 27 in oct/nov 2006 dont understand it at all
may/june 2007 question 3 the answer is A and i got it right but i just guessed it rlly :p
also question 16 in may/june 2007
ty :D
Click to expand...
Here
Untitled.png
27 : Magnesium + carbon --> Magnesium Carbonate
where as Cooper oxide + carbon ---> Copper + carbondioxide
and Carbondioxide turns lime water milky

3: Well, it says lower than the bp of water so it will be below 100, now count the lines..

16 : in 1 & 2 there is a change in the oxidation states
in 1 : oxygen has a deccrease in oxidation state from o to -2
sulfur increases from 0 to 4+
in 2: sulphur increases from +4 to +6
where as in the third one the oxidation states are same for each of them
 
Abu mota

Abu mota

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thats_me said:
Here
View attachment 11758
27 : Magnesium + carbon --> Magnesium Carbonate
where as Cooper oxide + carbon ---> Copper + carbondioxide
and Carbondioxide turns lime water milky

3: Well, it says lower than the bp of water so it will be below 100, now count the lines..

16 : in 1 & 2 there is a change in the oxidation states
in 1 : oxygen has a deccrease in oxidation state from o to -2
sulfur increases from 0 to 4+
in 2: sulphur increases from +4 to +6
where as in the third one the oxidation states are same for each of them
Click to expand...
tyvm bro :)
 
IGCSE O/L student

IGCSE O/L student

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Abu mota said:
nobody answers my questions :(
but mayb this time someone might so in oct/nov 2006 i dont understand why is question 8 is C
and also question 27 in oct/nov 2006 dont understand it at all
may/june 2007 question 3 the answer is A and i got it right but i just guessed it rlly :p
also question 16 in may/june 2007
ty :D
Click to expand...
Q 27 magnesium and other group 1 metals except lithium do not decompose
Q3 idk. :(
Q 16 the question is fishy!
 
MERIHAN

MERIHAN

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Capture.PNG PLZ HELP ME IN THIS QUESTION !!! THESE TYPE OF QUESTIONS ARE COMING AGAIN AND AGAIN IN PAST PAPER BUT I AM DOING THEM ALL WRONG !!!! MAY BE WE SHOULD KNOW SMETHING RELATED TO THEORY FOR THESE QUESTIONS !! IF SO THEN DO TELL ME !!:)

THANKS IN AVANCE TO ANYONE FOR GIVING ME THEIR PRECIOUS TIME :)
 
areebaization

areebaization

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MERIHAN said:
View attachment 11781 PLZ HELP ME IN THIS QUESTION !!! THESE TYPE OF QUESTIONS ARE COMING AGAIN AND AGAIN IN PAST PAPER BUT I AM DOING THEM ALL WRONG !!!! MAY BE WE SHOULD KNOW SMETHING RELATED TO THEORY FOR THESE QUESTIONS !! IF SO THEN DO TELL ME !!:)

THANKS IN AVANCE TO ANYONE FOR GIVING ME THEIR PRECIOUS TIME :)
Click to expand...
Cox they both r alkaline...in this Q:
if both r acidic= acidic sol.
one acidic one alkaline= almost near ph6
two alkali= alkaline ph
#Notice how both acidic solutions r not an option? :p
 
M

Mohammed Hassan

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Guys, plz help, anyone got the answers for the paper 1 chemistry old pastpapers ( 1993-2001)
plz help
Thnx in advance :)
 
A

Audi

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I am an o level student, i need notes on reflection, refraction and lenses plz :)
 
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