Physics paper 6 and chem paper 3 doubts

[Lost_Life]

im really scared about chemistry paper 3

 

[Lost_Life]

like um, wht does 'expect within the limits of accuracy' mean???

 

[Manobilly]

Precision measurements are those which are repeatable - so all measurements are clustered around the same value. An accurate measurement is where you are close to the true value.
A measurement can be precise but not accurate. If you have a piece of string which is 75cm long. You measure it and come up with values of 60cm, 60.5cm and 59.5cm - your measurements are precise but not accurate.Accurate will lie in 74.9,7504 and etc.

 

[kainat husain]

hey can sum 1 help me in this
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w05_qp_6.pdf
1c and d and question a :/ i dunno how 2 draw

 

[IGCSE O/L student]

like um, wht does 'expect within the limits of accuracy' mean???

it means if they ask you to calculate something and you get a value, which when compared with a value obtained from a theory has a slight difference.
If they ask you to say if the experiment proves the theory is right or wrong. you should say the theory is proved right within the limits of experimental accuracy.
your explanation should state that there may have been an error when measurements were taken or something like that

 

[Kapil]

hey can sum 1 help me in this
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w05_qp_6.pdf
1c and d and question a :/ i dunno how 2 draw

1 c) place the center of the protactor on the place where the zero end is tapped on the bench, and it should be perpendicular to the bench. Measure the lower slant of the ruler on the protactor, which is the angle of elevation hope you'll be able to draw

 

[Kapil]

hey can sum 1 help me in this
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w05_qp_6.pdf
1c and d and question a :/ i dunno how 2 draw

1 d) instead of measuring the angle of elevation, we can use a ruler instead of the protactor to measure the length elevated from the bench of the high end of the ruler ( the top most part of the ruler which hangs) instead of the lower end (zero mark).

 

[kainat husain]

1 d) instead of measuring the angle of elevation, we can use a ruler instead of the protactor to measure the length elevated from the bench of the high end of the ruler ( the top most part of the ruler which hangs) instead of the lower end (zero mark).

hmm but they r showin a protractor and askin to draw using that? i m not gettin u sorry can u please be more clear :/
and even 2 (a)

 

[Hamzeh S]

Guys Can some one explain the rays and pin in paper 6 i dont quite understand it ?

 

[IGCSE O/L student]

Guys Can some one explain the rays and pin in paper 6 i dont quite understand it ?

if it is regarding refraction, you put two pins on one side of a glass block after placing it on a sheet of paper, and drawing it's outline. by looking through the other side, try to place another 2 pins in line with the first two pins. remove the block and try to draw the two outer lines. join the two lines with a third line. this will be within the glass block. this is the refracted line.

 

[Hamzeh S]

Guys (CH3)2S
What does he means when () then a number ? he asked to draw the structure i drew the structure of ch3 then what ? :S

 

[Hamzeh S]

Valency Electorons digaram *

 

[IGCSE O/L student]

It means C has two atoms ,H has 6 ,multiply with the number inside them ,C has 1 so multiply by 1 ,H has 3 so multiply by 3.

isn't it supposed to be like this?:
C has 1 multiplied by two atoms, which C is 2. and H is 3 multiplied by two, which means it is 6.

 

[examkiller]

it says in oct/nov 2010 paper 61 . plz help those questions are killing me

 

[IGCSE O/L student]

it says in oct/nov 2010 paper 61 . plz help those questions are killing me

which question do you have a problem in?

 

[wooowooowoo]

It means C has two atoms ,H has 6 ,multiply with the number inside them ,C has 1 so multiply by 1 ,H has 3 so multiply by 3.

Dude, sorry to barge in but that's wrong. The correct answer is this ↓. People might get confused

C has 1 multiplied by two atoms, which C is 2. and H is 3 multiplied by two, which means it is 6.

 

[IGCSE O/L student]

Dude, sorry to barge in but that's wrong. The correct answer is this ↓. People might get confused

what's the correct answer?

 

[examkiller]

which question do you have a problem in?

the whole 3 pages i edited them .
2.C. I and q.3

 

[IGCSE O/L student]

the whole 3 pages i edited them .

oh, i didn't open your file.

 

[wooowooowoo]

what's the correct answer?

Your own post (lol)
IGCSE O/L student said: ↑

C has 1 multiplied by two atoms, which C is 2. and H is 3 multiplied by two, which means it is 6.​