• 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)

Chemistry P1 and P2 today

ritx

ritx

Messages
119
Reaction score
49
Points
38
Haris Sal11 said:
I used the Mr method. Mr of CaCO3 divided by Mr of CaCO3+ Mg(OH)2 x 0.500.
Click to expand...

The moles of calcium carbonate were taken in ratio with carbondoxide's moles. And CO2 moles were actually the volume i.e 96/24000= 0.004 moles. So 0.004 into Mr of calcium carbonate i.e 100 gave 0.4 grams. However the initial volume of gas was taken from the graph reading. This was the reason why they had printed a massive graph on an entire page.
 
Haris Sal11

Haris Sal11

Messages
108
Reaction score
19
Points
28
ritx said:
The moles of calcium carbonate were taken in ratio with carbondoxide's moles. And CO2 moles were actually the volume i.e 96/24000= 0.004 moles. So 0.004 into Mr of calcium carbonate i.e 100 gave 0.4 grams. However the initial volume of gas was taken from the graph reading. This was the reason why they had printed a massive graph on an entire page.
Click to expand...


My simple question is, why can't it be solved by the Mr method? The question was, what is the mass of CaCO3 in the antacid tablet? I did it by the method Mr of CaCO3/Mr Of CaCO3+Mr of Mg(OH)2 X 0.500.
 
Saad Mughal

Saad Mughal

Messages
2,797
Reaction score
2,035
Points
273
Aly Emran said:
i remember some question and need answer ( not A. B. C. or D. options)(dont know exact words of the questions):
1. separation method of liquid which is boiled and condesed
2. Isotopes of Bromine ( dont know this qstn's wording exactly)
3. Redox reaction in which both red and ox were occuring
4. the members of homologus series which was like four structures shown
5. the question had four statement about element from 21 to 30 protons
6. diamond, graphite and alloy qstn
7.how was Mg separated
8. use of sulphuric acid
9. the transfer of Na electron to other element( dunno its name)
10. the formula of X with options like HX, H2X3 etc
11.strontium ion contain electrons equal to
12. similar properties of K, Na and Ca
13.Hydrogen and sulfur compound and electrical conductivity
14. and electrolysis qstn was of concentrated element ( if anyone remembers the qstn)

The rest i forgot :p
Click to expand...

Distillation.
Isotopes occur in equal amounts.
It was a displacement reaction, something like Cu +2 + Fe ---> Fe +2 + Cu.
Don't remember.
It was, various oxides and coloured compounds. (The last two).
Don't remember.
Don't remember.
In making fertilizers.
Don't remember.
HX.
Krypton.
Don't remember.
Covalent - Don't conduct.
Chlorine Gas.
 
A

altox876

Messages
157
Reaction score
56
Points
38
Aly Emran said:
i remember some question and need answer ( not A. B. C. or D. options)(dont know exact words of the questions):
1. separation method of liquid which is boiled and condesed
2. Isotopes of Bromine ( dont know this qstn's wording exactly)
3. Redox reaction in which both red and ox were occuring
4. the members of homologus series which was like four structures shown
5. the question had four statement about element from 21 to 30 protons
6. diamond, graphite and alloy qstn
7.how was Mg separated
8. use of sulphuric acid
9. the transfer of Na electron to other element( dunno its name)
10. the formula of X with options like HX, H2X3 etc
11.strontium ion contain electrons equal to
12. similar properties of K, Na and Ca
13.Hydrogen and sulfur compound and electrical conductivity
14. and electrolysis qstn was of concentrated element ( if anyone remembers the qstn)

The rest i forgot :p
Click to expand...
1 distillation
2 Equal proportions
3 Zn +Cu2+ one
5 3 and 4 (coloured sulfates and multiple oxides)
6 2(all hav high melting points) and 3 which i don't remember.
8 Fertilisers
9 Transfers 1 electron
10 HX
The rest I don't remember
 
You must log in or register to reply here.
Top