Chemistry Paper 1 Doubts Here... !

[anonymous123]

What do we know....the answer is C
Its not from the past papers. It was in a textbook and the answers were given at the end..I just didn't notice

 

[AStarHunter]

oh, at least we know the answer now

 

[gary221]

coz i read the M.S b4 and it mentioned this
AND an aircraft SHOULD be strong and light << logic

yeah ur rite
i read tht too!!!

 

[gary221]

u must look at the equation given and then see the proton transfer as :
acid is a proton donor
base is a proton acceptor
so if once a acid accept proton i will be considered as a base

same goes with the water

hope u understood

i think it cud also be H+ donor/ acceptors
ie if a substance accepts H+ ions it is a base n vice versa
so 4 a ques like why is substance X acting like an acid, d ans is bcoz it is accepting H+ ions

hope u get it!

 

[gary221]

guyz, I have questions (as usual ! )

Okay so here is the first Question. It is kinda difficult to explain so I attached it



Okay 2nd Question is : Which substance can neutralise hydrochloric acid ?

• Ammonia
  Carbon Dioxide
  Litmus Solution

(& why that one and not the others )

3rd Question is also attached --->

Thnx guyz for actually reading this && trying to help annoying me

for d third ques why cant it be D???

 

[gary221]

What do we know....the answer is C
Its not from the past papers. It was in a textbook and the answers were given at the end..I just didn't notice

shudnt it be D???

 

[haochen]

the first answer :
lime

the second answer is ammonia because it is a base so it can neutralize HCL
while carbon dioxide and litmus solution cant.

the third answer :
Its A

hey haochen, i think the third Answer is "B" not "A" because aluminium is used in food containers as it is light and resists corrosion, and you can check that answer from the syllabus here at this link http://www.xtremepapers.me/CIE/Cambridg ... y11_sy.pdf PAGE 22 , hope i helped

ohh yeah its B
i was checking my answer and realize that I wrote A so i changed it
btw thx for telling

 

[haochen]

for d third ques why cant it be D???

the answer cant be D coz stainless steel is not cheap "it is an alloy"

hope u got it

 

[xIshtar]

for d third ques why cant it be D???

the answer cant be D coz stainless steel is not cheap "it is an alloy"

hope u got it

I needs your help

On the P3 doubts thread

 

[gary221]

for d third ques why cant it be D???

the answer cant be D coz stainless steel is not cheap "it is an alloy"

hope u got it

yup got it!!

 

[moonlight22]

Q.P--> http://www.xtremepapers.me/CIE/Cambridg ... _qp_12.pdf
M.S--> http://www.xtremepapers.me/CIE/Cambridg ... _ms_12.pdf
Question 8
answer: "A" silver is a reactive metal ! how ? isn`t silver under copper in the reactivity series ??
why not "B" !!!!!!! OMG IT`S SOOOOOO TRICKY MAAAAN

 

[xIshtar]

Q.P--> http://www.xtremepapers.me/CIE/Cambridg ... _qp_12.pdf
M.S--> http://www.xtremepapers.me/CIE/Cambridg ... _ms_12.pdf
Question 8
answer: "A" silver is a reactive metal ! how ? isn`t silver under copper in the reactivity series ??
why not "B" !!!!!!! OMG IT`S SOOOOOO TRICKY MAAAAN

Basically, it says what statement is not correct. So, yes, the electrolyte is a dissolve silver salt, and the spoon would be the cathode. Also, the metal electrode would be silver. However, the electroplating does not depend on the reactivity, so A is the answer, as it is the only incorrect statement.

 

[LimeReem]

doubt...
Q-Astatine is an element in Group VII of the Periodic Table. It has only ever been produced in very
small amounts.

What is the best description of its likely properties?
colour state reaction with aqueous potassium iodide
black solid no reaction
dark brown gas brown colour
green solid no reaction
yellow liquid brown colour

What is the answer and how do we know it?

 

[LimeReem]

darrn. it wont merge =/
http://www.xtremepapers.me/CIE/Cambridg ... _qp_11.pdf Q24

 

[xIshtar]

Firstly, assess it's position in the periodic table.. It is at the bottom of group VII..

As you move down the group, colour gets darker, mp and bp both increase, and the states shift to solid.

Thus, A is the only acceptable answer.

 

[gary221]

doubt...
Q-Astatine is an element in Group VII of the Periodic Table. It has only ever been produced in very
small amounts.

What is the best description of its likely properties?
colour state reaction with aqueous potassium iodide
black solid no reaction
dark brown gas brown colour
green solid no reaction
yellow liquid brown colour

What is the answer and how do we know it?

u hv 2 keep d properties of d group in mind
in grp 7 the physical properties increase ie as u move downd grp it turns frm gas-liquid- solid.
also d color becomes darker down d grp
so its d first one
hpe u got it!!! :wink: :wink:

 

[LimeReem]

Ahh thankyou guys. It really helped me! =D
http://www.xtremepapers.me/CIE/Cambridg ... _qp_11.pdf
another doubt. sorry im kind of stupid? =P
In q8..
Covalent bonds share electrons and when X bonds with Y , will have full outer shell. , so why cant it be XY?

 

[xIshtar]

Both need to have a full outer shell. If XY is the bond made, Y Still needs 2 bonds.

Thus it is X3Y or D.

 

[gary221]

hey guys i hv sum doubts
pls help



thnx :wink: :wink:

 

[JmCullen]

2) B
3) C
4) D
15) (no idea) mayb D
30) D