• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

P

princess nawoola

Messages
4
Reaction score
1
Points
1
IM FREAKING OUT ABOUT CHEMISTRY MY EXAM IS THIS AFTERNOON AND I DIDNT STUDY ANYTHING!! what are the main things that i have to concentrate on and like what shud i do right now cuz im really demotivated and its my last exam :/
and plz dont tell me pastpapers cuz ive done those i need good revision
 
T

T19

Messages
134
Reaction score
24
Points
38
CHEMISTRY O/N 2007 Q11 I
I DON'T KNOW WHAT TO DO ?
THANX IN ADVANCE:)
 
angel G

angel G

Messages
53
Reaction score
9
Points
8
JustineBerry said:
Atom X has 8 more electrons than atom Y, so they could be in Group 8, like Helium and Neon, etc. Thus, both students could be right and the answer is A :)

For Q23, Copper as a metal does not react with any acid except for nitric acid. So option 1 is completely eliminated. The remaining options are 2 and 3, which is C :)
Click to expand...
Thank u !:)
 
thats_me

thats_me

Messages
859
Reaction score
360
Points
73
T19 said:
CHEMISTRY O/N 2007 Q11 I
I DON'T KNOW WHAT TO DO ?
THANX IN ADVANCE:)
Click to expand...
Aite here..
I molecule of organic compound +8O2
_______ +8O2---> __CO2 +__H2O
Lets start with A
C5H11OH +8O2 --->5CO2 +6H2O (It doesn't balance H &C are balanced but oxygen is not)
Try with B
C6H9OH+8O2 --->6CO2 +5H2O (Balanced! :D)
so Ans is B ..!
 
  • Like
Reactions: T19
A

Ahmed Khider

Messages
671
Reaction score
641
Points
103
thats_me there is this question about nickel and plating and it contains 4 electrodes could u please show me how to solve it??I dont remember the year :/
 
сᴏᴏʟ сяуѕтᴀʟѕ

сᴏᴏʟ сяуѕтᴀʟѕ

Messages
1,210
Reaction score
10,974
Points
698
thats_me

thats_me

Messages
859
Reaction score
360
Points
73
Ahmed Khider said:
thats_me there is this question about nickel and plating and it contains 4 electrodes could u please show me how to solve it??I dont remember the year :/
Click to expand...
Umm i remmember doin it but don really remmember the ques properly i hope this helps..
So For electrplating :
Cathode should have the metal which is being plated
so nickel should be placed on cathode because reduction takes place on cathode and reduction is the gain of electrons
So make sure it's CONNECTED to the negative electrode
Then either the electrolyte or the anode should have the plating metal ..
 
A

Ahmed Khider

Messages
671
Reaction score
641
Points
103
thats_me said:
Umm i remmember doin it but don really remmember the ques properly i hope this helps..
So For electrplating :
Cathode should have the metal which is being plated
so nickel should be placed on cathode because reduction takes place on cathode and reduction is the gain of electrons
So make sure it's CONNECTED to the negative electrode
Then either the electrolyte or the anode should have the plating metal ..
Click to expand...
Ok thx alottt :)
 
salvatore

salvatore

Messages
382
Reaction score
315
Points
73
Ahmed Khider said:
Guys could anyone explain this question>>S04 qno 15??
Click to expand...
Breaking bonds requires energy and hence, they are endothermic while forming bonds gives out energy and therefore, they are exothermic. In the question, bonds in X2 and Y2 are broken (Showing that they are endothermic) and bonds in XY are formed (Exothermic). So the answer here is C!
 
A

Ahmed Khider

Messages
671
Reaction score
641
Points
103
salvatore said:
Breaking bonds requires energy and hence, they are endothermic while forming bonds gives out energy and therefore, they are exothermic. In the question, bonds in X2 and Y2 are broken (Showing that they are endothermic) and bonds in XY are formed (Exothermic). So the answer here is C!
Click to expand...
Thx alott :D
 
You must log in or register to reply here.
Top