Chemistey Doubts

[brainiac]

yup its the reactivity series ...........

 

[xIshtar]

Yah its the right answer ............can u upload the discharge series......plz .........by the way thnx

The discharge series should be in your chemistry book..

Just remember that more reactive metals are lower..
H is above them in the series..
SO4 is lower than OH..

Best advice I can give

Just look in your book at the electrolysis chapter.

Discharge series means reactivity series or whatttttttttttttt..............................

Discharge series is completely different to the reactivity series

 

[MohammedNoor]

The discharge series should be in your chemistry book..

Just remember that more reactive metals are lower..
H is above them in the series..
SO4 is lower than OH..

Best advice I can give

Just look in your book at the electrolysis chapter.[/quote]
Discharge series means reactivity series or whatttttttttttttt..............................[/quote]


then what is it(2morow exam) plz upload them...........

Discharge series is completely different to the reactivity series [/quote]

 

[MohammedNoor]

plz upload discharge series.............plz

 

[gary221]

plz upload discharge series.............plz

see its just tht at d cathode metals n hydrogen gas is deposited n at d anode non metals eg oxygen, chlorine, etc is deposited
unless unreactive metals such as Cu, Ni, etc r present... H2 is released at d cathode


halogens r discharged at d anode in preference to oxygen...
hope u got it!!

 

[JmCullen]

Describe the manufacture of lime (calcium oxide) from calcium carbonate (limestone)...
how?
add hydrogen???

 

[gary221]

Describe the manufacture of lime (calcium oxide) from calcium carbonate (limestone)...
how?
add hydrogen???

no just strongly heat the CaCO3
it will thermally decompose to give CaO and CO2

 

[MohammedNoor]

plz upload discharge series.............plz

see its just tht at d cathode metals n hydrogen gas is deposited n at d anode non metals eg oxygen, chlorine, etc is deposited
unless unreactive metals such as Cu, Ni, etc r present... H2 is released at d cathode


halogens r discharged at d anode in preference to oxygen...
hope u got it!!

thnx i got it

 

[gary221]

plz upload discharge series.............plz

see its just tht at d cathode metals n hydrogen gas is deposited n at d anode non metals eg oxygen, chlorine, etc is deposited
unless unreactive metals such as Cu, Ni, etc r present... H2 is released at d cathode


halogens r discharged at d anode in preference to oxygen...
hope u got it!!

thnx i got it

no prob!! :wink: :wink:

 

[MohammedNoor]

http://www.xtremepapers.me/CIE/Cambridg ... 8_qp_1.pdf



plz can anyone make me understand the question 3


plz plz

 

[gary221]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w08_qp_1.pdf



plz can anyone make me understand the question 3


plz plz

the ans is B rite??
see u hve to remember the tests 4 iodide - add lead nitrate n a yellow ppt is formed
so ther u go
its B!!

 

[MohammedNoor]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w08_qp_1.pdf



plz can anyone make me understand the question 3


plz plz

the ans is B rite??
see u hve to remember the tests 4 iodide - add lead nitrate n a yellow ppt is formed
so ther u go
its B!!

thnx alot!!!!!!!!!!!!!!!!!!

 

[JmCullen]

Describe the manufacture of lime (calcium oxide) from calcium carbonate (limestone)...
how?
add hydrogen???

no just strongly heat the CaCO3
it will thermally decompose to give CaO and CO2

oh!! okok! thankssss..
get it!

 

[MohammedNoor]

Describe the manufacture of lime (calcium oxide) from calcium carbonate (limestone)...
how?
add hydrogen???

no just strongly heat the CaCO3
it will thermally decompose to give CaO and CO2

oh!! okok! thankssss..
get it!

thnx for the question even i had doubt in it!!!!!!!!!!!

 

[MohammedNoor]

http://www.xtremepapers.me/CIE/Cambridg ... 8_qp_1.pdf


Q 35 what is it i didnt get anything!!!!!!!!!!

 

[MohammedNoor]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w08_qp_1.pdf


Q 35 what is it i didnt get anything!!!!!!!!!!

and question 22 also.........

 

[gary221]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w08_qp_1.pdf


Q 35 what is it i didnt get anything!!!!!!!!!!

the ans is D, i think!
look u hve to keep the rusting process in mind
iron + oxygen = iron oxide
thus the O2 in the test tube will be used up and the tube will fill wth water

hpe u gt it!!

 

[xIshtar]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w08_qp_1.pdf


Q 35 what is it i didnt get anything!!!!!!!!!!

and question 22 also.........

Question 22 is D. This is because in the first reaction, ammonia is produced, which turns red litmus paper blue. In experiment 2, there is no reaction when an acid is added to a neutral salt, so there is no change, thus showing us that the answer is D.

Question 35 is D too. This is because, in the process of rusting, the iron is oxidised, which uses up oxygen. So, if there is pure oxygen, there is a greater availability, and thus more rust will form. This will cause the volume and thus pressure to decrease further, which will have a sucking effect on the water, drawing it the furthest up the tube.


Hope I helped

Remember to click the thank button guys

 

[MohammedNoor]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w08_qp_1.pdf


Q 35 what is it i didnt get anything!!!!!!!!!!

and question 22 also.........

Question 22 is D. This is because in the first reaction, ammonia is produced, which turns red litmus paper blue. In experiment 2, there is no reaction when an acid is added to a neutral salt, so there is no change, thus showing us that the answer is D.

Question 35 is D too. This is because, in the process of rusting, the iron is oxidised, which uses up oxygen. So, if there is pure oxygen, there is a greater availability, and thus more rust will form. This will cause the volume and thus pressure to decrease further, which will have a sucking effect on the water, drawing it the furthest up the tube.


Hope I helped

Remember to click the thank button guys

but in 22 there is 2 litmus papers that i didnt get

 

[MohammedNoor]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w08_qp_1.pdf


Q 35 what is it i didnt get anything!!!!!!!!!!

the ans is D, i think!
look u hve to keep the rusting process in mind
iron + oxygen = iron oxide
thus the O2 in the test tube will be used up and the tube will fill wth water

hpe u gt it!!

thnx alot