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yup its the reactivity series ...........
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MohammedNoor said:Discharge series means reactivity series or whatttttttttttttt..............................xIshtar said:MohammedNoor said: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.
see its just tht at d cathode metals n hydrogen gas is deposited n at d anode non metals eg oxygen, chlorine, etc is depositedMohammedNoor said:plz upload discharge series.............plz
no just strongly heat the CaCO3JmCullen said:Describe the manufacture of lime (calcium oxide) from calcium carbonate (limestone)...
how?
add hydrogen???
thnx i got itgary221 said:see its just tht at d cathode metals n hydrogen gas is deposited n at d anode non metals eg oxygen, chlorine, etc is depositedMohammedNoor said:plz upload discharge series.............plz
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!!
no prob!! :wink: :wink:MohammedNoor said:thnx i got itgary221 said:see its just tht at d cathode metals n hydrogen gas is deposited n at d anode non metals eg oxygen, chlorine, etc is depositedMohammedNoor said:plz upload discharge series.............plz
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!!
the ans is B rite??MohammedNoor said: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
gary221 said:the ans is B rite??MohammedNoor said: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
see u hve to remember the tests 4 iodide - add lead nitrate n a yellow ppt is formed
so ther u go
its B!!
gary221 said:no just strongly heat the CaCO3JmCullen said:Describe the manufacture of lime (calcium oxide) from calcium carbonate (limestone)...
how?
add hydrogen???
it will thermally decompose to give CaO and CO2
thnx for the question even i had doubt in it!!!!!!!!!!!JmCullen said:gary221 said:no just strongly heat the CaCO3JmCullen said:Describe the manufacture of lime (calcium oxide) from calcium carbonate (limestone)...
how?
add hydrogen???
it will thermally decompose to give CaO and CO2
oh!! okok! thankssss..
get it!
MohammedNoor said: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!MohammedNoor said:http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w08_qp_1.pdf
Q 35 what is it i didnt get anything!!!!!!!!!!
MohammedNoor said:MohammedNoor said: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.........
xIshtar said:MohammedNoor said:MohammedNoor said: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
gary221 said:the ans is D, i think!MohammedNoor said:http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w08_qp_1.pdf
Q 35 what is it i didnt get anything!!!!!!!!!!
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!!
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