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phy P4 help
- Thread starter princesszahra
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good for u!!!!!!!!!!1
PlanetMaster
XPRS Administrator
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Press 'Mode' 2 times and press '3' to enter 'BASE' mode.
Make sure you're entering value in decimal (or your required mode) by pressing 'DEC' (x² button).
Enter the value, press = and press 'BIN' to convert it into binary.
Make sure you're entering value in decimal (or your required mode) by pressing 'DEC' (x² button).
Enter the value, press = and press 'BIN' to convert it into binary.
Im tempted to buy a ES calc now.. shall i buy it when the exams are so close?? :SSSS.. i hav one of those non-natural display onewhich can do quadratic equations and a somple natural display wala calc... but i want the silver one.. shall i buy it now???
PlanetMaster
XPRS Administrator
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It can be used without any issues.
ES series is far more better than MS ones.
Buy it as soon as possible and practise at least 4-5 papers using ES.
I'll recommend Fx-570ES. It gives you best value for money too.
ES series is far more better than MS ones.
Buy it as soon as possible and practise at least 4-5 papers using ES.
I'll recommend Fx-570ES. It gives you best value for money too.
PlanetMaster
XPRS Administrator
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If that happens to any of you, inform your school teacher (or British Council) immediately after paper.
Your teacher (or British Council) will send a letter to CIE within 24hrs and they'll keep that into consideration while checking your paper.
Your teacher (or British Council) will send a letter to CIE within 24hrs and they'll keep that into consideration while checking your paper.
i have some problems, can someone plz help me out?
jun 05 q7c
nov 06 q3c
jun 03 q2 a
looking forward for a rply...and thanx in advance.
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"Reach high, for stars lie hidden in your soul. Dream deep, for every dream precedes the goal."
jun 05 q7c
nov 06 q3c
jun 03 q2 a
looking forward for a rply...and thanx in advance.
------------------------------------------------------------------------------------------------------------------
"Reach high, for stars lie hidden in your soul. Dream deep, for every dream precedes the goal."
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http://notezone.net/cambridgechem/chemi ... sis%5D.pdf can sum1 go in dix page 11 n do solve n gimme answers plzzzz i cant able to slove it n it might cum for exam help mee!!!!
http://notezone.net/cambridgechem/chemi ... sis%5D.pdf plz go dix link pg 11 n c answers below of it
First of all you need the mass of FA1. In the first table you have the mass of the empty test tube and the
mass of the test tube + FA1. All you do is subtract the values 12.80 - 10.50 giving you 2.30g of FA1.
In the second table you need the mass of FA1 after heating. Again, you just subtract the values 11.76 -
10.50 = 1.26g FA1 after heating.
1 d. (i) The mass of anhydrous XS04 present in the crystals is what is left over after heating = 1.26g
1 d. (ii) The mass of water driven from the crystals is the loss in mass that has occurred when the FA1 was
heated. Before heating there were 2.30g of FA1 and after heating there were 1.26g. So the mass of water
lost is 2.30 - 1.26 = 1.04g
1 e. To calculate the number of moles of water in the sample of FA1 you use the formula no. of moles =
mass/mass of 1 mole which gives you 1.04/18 = 0.058 mol
1 f. The number of moles in XSO4
7 moles of H20 gives 1 mole XSO4 (from the formula XSO4.7H20)
So 0.058 moles of water give 0.058/7 = 8.29 x 10 ^ -3 moles of XSO4
1 g. To calculate the relative formula mass of XSO4 you use the formula mass of 1 mole = mass/no. of
moles which gives you 1.26/8.29 x 10 ^ -3 = 152.7
1 h. To calculate the Ar of element X you first find the Mr of SO4 which is 32 + (4 x 16) = 96
You subtract this from the RFM from part g giving you 152.7 - 96 = 56.7
First of all you need the mass of FA1. In the first table you have the mass of the empty test tube and the
mass of the test tube + FA1. All you do is subtract the values 12.80 - 10.50 giving you 2.30g of FA1.
In the second table you need the mass of FA1 after heating. Again, you just subtract the values 11.76 -
10.50 = 1.26g FA1 after heating.
1 d. (i) The mass of anhydrous XS04 present in the crystals is what is left over after heating = 1.26g
1 d. (ii) The mass of water driven from the crystals is the loss in mass that has occurred when the FA1 was
heated. Before heating there were 2.30g of FA1 and after heating there were 1.26g. So the mass of water
lost is 2.30 - 1.26 = 1.04g
1 e. To calculate the number of moles of water in the sample of FA1 you use the formula no. of moles =
mass/mass of 1 mole which gives you 1.04/18 = 0.058 mol
1 f. The number of moles in XSO4
7 moles of H20 gives 1 mole XSO4 (from the formula XSO4.7H20)
So 0.058 moles of water give 0.058/7 = 8.29 x 10 ^ -3 moles of XSO4
1 g. To calculate the relative formula mass of XSO4 you use the formula mass of 1 mole = mass/no. of
moles which gives you 1.26/8.29 x 10 ^ -3 = 152.7
1 h. To calculate the Ar of element X you first find the Mr of SO4 which is 32 + (4 x 16) = 96
You subtract this from the RFM from part g giving you 152.7 - 96 = 56.7