How was paper went of CHEMISTRY 5070/22

[sid2333]

There was a question in MCQs paper; that a gas which turns blue litmus paper red gives a precipitate with calcium oxide. So, if you can remember, what was the correct answer? HCl or CO2??? The other two options were definitely wrong: NH3 or one other i dont remember exactly what

 

[Dark Destination]

There was a question in MCQs paper; that a gas which turns blue litmus paper red gives a precipitate with calcium oxide. So, if you can remember, what was the correct answer? HCl or CO2??? The other two options were definitely wrong: NH3 or one other i dont remember exactly what

CO2..

 

[sid2333]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_y14_sy.pdf

If you look at the last point of the syllabus it clearly mentions ''Simple sugars''..
Because even starch is a complex sugar. Cellulose too. They're all sugars.

So will they accept just ''Sugars''? Or will i lose the mark here?

I also wrote Simple sugar and Glucose my friend. I hope it may be correct. Well, it ought to be in my way!

 

[Syed Mirak]

yep

The answer to that electrons question in mcq was 22 right? That don't take part in bonding?

 

[sid2333]

HIGH FIVE

CO2..

 

[sid2333]

Maybe.. :/

So you're losing one mark in paper 1 only?

 

[Dark Destination]

I also wrote Simple sugar and Glucose my friend. I hope it may be correct. Well, it ought to be in my way!

Your will be correct. It's mentioned in the syllabus. But mine will be wrong. I only wrote ''Sugars''..

 

[Syed Mirak]

which one forms the largest number of hydrides? carbon or nitrogen?

 

[Dark Destination]

which one forms the largest number of hydrides? carbon or nitrogen?

Carbon

 

[sid2333]

Sid233 stop acting like a jerk..u're not the only one to answer right questions -_-

Bro, I'm just stating it. Not confronting, am I?

 

[sid2333]

CARBON

which one forms the largest number of hydrides? carbon or nitrogen?

 

[Dark Destination]

Bro, I'm just stating it. Not confronting, am I?

You didn't write H+ + OH- --> H2O

Why?

 

[Dark Destination]

For the physical properties of magnesium astatide i wrote

High melting point. and soluble in water. Is this correct? 2/2?

 

[Dark Destination]

For the used in making steel, i wrote O2?

 

[sid2333]

i got 62.9%

You didn't write H+ + OH- --> H2O

Why?

i thought it wasn't. I'm my own boss

 

[Dark Destination]

i thought it wasn't. I'm my own boss

Even not 62.9%? What question was this?

 

[sid2333]

yeah! I wrote the same..

For the used in making steel, i wrote O2?

 

[Dark Destination]

For Polyunsaturated i wrote it has double bonds in a number of places, many double bonds. Is this correct?

 

[sid2333]

Even not 62.9%? What question was this?

i thought the ques in which u needed to find out the percentage yield of ammonium phosphate. Did you get it 62.9?

 

[Dark Destination]

i thought the ques in which u needed to find out the percentage yield of ammonium phosphate. Did you get it 62.9?

I divided that actual yield, 2 something, byt 4.66 and into hundred. Wbu?