Physics, Chemistry and Biology: Post your doubts here!

[Lost_Life]

As AAnsarii said, it increases as the size of the atom increases, but for G 1 i guess there is an exception for K as it does not follow a trend!

the first three decreases the next three increases

 

[AAnsarii]

the first three decreases the next three increases

thought of dat, but 4 dis reason Google is horrible! gives innumerable search results

 

[Lost_Life]

thought of dat, but 4 dis reason Google is horrible! gives innumerable search results

lol just take it as increases, thats what my teacher said..

 

[Student of the year]

1-C
11-A

plz explain this

 

[AAnsarii]

imp concepts/difficult/whatever. plz ppl...

 

[AAnsarii]

plz explain this

1-C, they slow down as liquid molecules have a lesser speed, n closer 2gether coz it looks sensible--same amt of substance will tk lesser space in liquid state than gas
11-A, mass increases, so sth must b added, when u heat Cu, u get CuO, increase in no. of atoms=increase in mass

 

[AAnsarii]

and also 17) copper oxide always forms copper after heating
18) the most reactive is never reduced

CuO 4ms Cu? heating simply or wid C?

 

[thats_me]

What happens to copper oxide when heated?

 

[Student of the year]

w04_qp_1 q31 & q40
someone plz explain

 

[Student of the year]

1-C, they slow down as liquid molecules have a lesser speed, n closer 2gether coz it looks sensible--same amt of substance will tk lesser space in liquid state than gas
11-A, mass increases, so sth must b added, when u heat Cu, u get CuO, increase in no. of atoms=increase in mass

jazakallah

 

[thats_me]

w04_qp_1 q31
someone plz explain

It's D cz clean air does not have hydrogen

 

[AAnsarii]

jazakallah

wa iyyakum

 

[AAnsarii]

imp concepts/difficult/whatever. plz ppl...

Plz

 

[AAnsarii]

What happens to copper oxide when heated?

nby noes at home, http://answers.yahoo.com/question/index?qid=20080319021128AAZBMUg visit dis

 

[thats_me]

nby noes at home, http://answers.yahoo.com/question/index?qid=20080319021128AAZBMUg visit dis

home :S
It melts or decomposes? :|

 

[FATIMAH]

I don't think that's important in this question (unless you are just asking for extra info)

WHY THE ANSWER TO QUESTION 36 IS A ????? PLZ TELL

 

[Student of the year]

It's D cz clean air does not have hydrogen

thanks a lot

 

[thats_me]

thanks a lot

No problem

 

[gelato]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s08_qp_1.pdf
#12 - why is it not B?
#19 - final answer is D. Why does the oxidation state stay the same?

 

[FATIMAH]