Physics, Chemistry and Biology: Post your doubts here!

[ahmed faraz]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s07_qp_1.pdf
q5

 

[Phoenix Blood]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s07_qp_1.pdf
q5

Mass of half the bottle= 1.30-1.90
Mass of full bottle= mass of half bottle*two.
Correct?

 

[Gamedos]

common ahmed faraz the physics exams are over

 

[Gamedos]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s07_qp_1.pdf
q5

it should be
(1.30-your answer)/2=0.90-your answer

 

[hard_worker]

Right, so 42 is greater than 30. 22 is not :B)

they asked for the angle in water ..air was given 30

 

[hard_worker]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s07_qp_1.pdf
q5

u didnt do ur exam yet

 

[DonatKap]

Guys who did varient 1? can you start a conversation with me? Cause I don't know how to. I have something to discuss but it can get me banned here so not sure :/

 

[Phoenix Blood]

they asked for the angle in water ..air was given 30

No, they said the incindent ray in the glass was 30 degrees. Find the refracted ray as it passes ti the air. I'm right?

 

[dubi2pro]

No, they said the incindent ray in the glass was 30 degrees. Find the refracted ray as it passes ti the air. I'm right?

Yepp!

 

[Phoenix Blood]

Yepp!

42 right or 22, finally?

 

[DonatKap]

Ok I'll just post it. In the first part of question about Power I made a mistake. I multiplied by 60 instead of dividing but my working and formula were correct and in the second part of the question, my formula and working were correct but I used a wrong answer from the first part :/ So will they use error carried forward so I will get maximum mark in the second part? or they will just give me zero?

 

[Xylferion]

42 right or 22, finally?

Denser to rarer, is Sin R / Sin I. Do the rest from there, not allowed to say the answer, remember?

 

[Phoenix Blood]

Denser to rarer, is Sin R / Sin I. Do the rest from there, not allowed to say the answer, remember?

Explanation is the same as answering only.

 

[sumaiyarox:)]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s07_qp_1.pdf
q5

Mass öf füll bottle = 1.30 kg
Mäss öf half-filled bottle = 0.9 kg
Mäss of õil removed = (1.30 - 0.9) = 0.4 kg
Mass of empty bottle = ( Mass of full bottle - Mass of oil removed*2) = 0.5 kg

 

[DonatKap]

Ok I'll just post it. In the first part of question about Power I made a mistake. I multiplied by 60 instead of dividing but my working and formula were correct and in the second part of the question, my formula and working were correct but I used a wrong answer from the first part :/ So will they use error carried forward so I will get maximum mark in the second part? or they will just give me zero?

Anyone?

 

[Masha karroum]

 

[Masha karroum]

exaplain please 9 a and 9 b

 

[Gamedos]

exaplain please 9 a and 9 b

this is a)

Magnesuim 72% 72g/100g 72/24=3

Nitrogen 28% 28g/100g 28/14=2


Empirical formula

Mg3N2

 

[Gamedos]

exaplain please 9 a and 9 b

this is b)

0.03 X + H2O------->0.12 Al(OH)3 + 0.09 CH4
0.03*4=0.12
0.03*3=0.09

Al4C3 + 12 H2O ------> 4 Al(OH)3 + 3CH4

 

[Zsiddiqui]

In chemistry.
A reaction between and metal and water gives with a metal hydroxide or a metal oxide.
How will i know which type of product will it form ?