Physics, Chemistry and Biology: Post your doubts here!

[zain1245780]

1. take a known mass of water
2. take d initial temp
3. take known mass of fuel
4. heat using a spirit burner(can draw a diagram for dis)
5. repeat using other fuel
6. make sure d masses and time r same fr both
7. compare d two results

im obliged! you really know how to read the MS, dont you

 

[diamondsky]

im obliged! you really know how to read the MS, dont you

the paper was actually discussed in class n d teacher had d ms
i juz remember dat

 

[zain1245780]

the paper was actually discussed in class n d teacher had d ms
i juz remember dat

can you help me with Q.2c http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s10_qp_62.pdf
and do we have to dip it in the green solution or use any other solvent and which solvent?

 

[diamondsky]

can you help me with Q.2c http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s10_qp_62.pdf
and do we have to dip it in the green solution or use any other solvent and which solvent?

u gotta perform chromatography
1.make a line wid pencil on a chromatography ppr
2.put a drop of d soln. on d line
3.put d ppr in a beaker wid water below d line
4. w8 for sum tym for d soln to spread and diff colours will move 2 diff points

 

[zain1245780]

u gotta perform chromatography
1.make a line wid pencil on a chromatography ppr
2.put a drop of d soln. on d line
3.put d ppr in a beaker wid water below d line
4. w8 for sum tym for d soln to spread and diff colours will move 2 diff points

what is the solvent, coz in MS its written that water cant be a solvent and can you plz also help me with Q.7 http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s10_qp_62.pdf

 

[koko288]

c.i)it would remain position
c.ii) the centre of mass is at the pivot
clockwise moment = anticlockwise moment

i know that scine it is written in the MS i hope u for further explanation
thanks in advance

 

[NaAs Mohd]

I have my biology paper 6 exam coming up and i am still having difficulties knowing what chapters to study ..
Can any one help me ??

Thanks .

 

[diamondsky]

i know that scine it is written in the MS i hope u for further explanation
thanks in advance

i checked d examiner report for further explanation
quoting it
"Very few candidates realised that once the sculpture was balanced, it would remain so in any position, since the centre of mass is at the pivot. Often candidates followed up an incorrect initial statement with something correct like “moments balance” or “in equilibrium”. Examiners gave credit for these correct explanations despite the contradiction with the original statement. Statements confusing forces and moments were often seen, candidates seeing the words as interchangeable, but these did not gain credit. "

 

[diamondsky]

I have my biology paper 6 exam coming up and i am still having difficulties knowing what chapters to study ..
Can any one help me ??

Thanks .

do evrythin except genetics n ecology

 

[diamondsky]

what is the solvent, coz in MS its written that water cant be a solvent and can you plz also help me with Q.7 http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s10_qp_62.pdf

solvent is ethanol - chlorophyll dissolves in organic solvents
heating test
1. heat foil for 2 mins over d same flame
2. put in a beaker with 20 cm3 of water
3. record temp. rise
4. repeat wid other foil
corrosion test
1. add 10 cm3 of HCl to foil
2. heat it for 1 min
3. observe reaction
4. repeat wid other metal

 

[zain1245780]

solvent is ethanol - chlorophyll dissolves in organic solvents
heating test
1. heat foil for 2 mins over d same flame
2. put in a beaker with 20 cm3 of water
3. record temp. rise
4. repeat wid other foil
corrosion test
1. add 10 cm3 of HCl to foil
2. heat it for 1 min
3. observe reaction
4. repeat wid other metal

why do we have to heat the foil and place it in a beaker...???

 

[MaRyy xD]

Bio paper 6: Do we have to draw all graphs using a ruler?

 

[diamondsky]

why do we have to heat the foil and place it in a beaker...???

heat it over a tripod using tongs n den place it inside d beaker

 

[diamondsky]

Bio paper 6: Do we have to draw all graphs using a ruler?

no
if dey specify u hav 2 draw a 'straight line' den use a ruler
otherwise its supposed to b freehand

 

[Jau Kumar]

stop spreading your terrorist language d bag

 

[diamondsky]

stop spreading your terrorist language d bag

???

 

[Jau Kumar]

Dont worry diamond ur a good guy

 

[semsemhosam]

I have my biology paper 6 exam coming up and i am still having difficulties knowing what chapters to study ..
Can any one help me ??

Thanks .

http://www.xtremepapers.com/communi...t-your-doubts-here.11053/page-180#post-397381

 

[semsemhosam]

stop spreading your terrorist language d bag

?!

 

[zain1245780]

diamondsky hey man , can you send me a link of the colours of the common crystals and solutions? and can you name me some salts of chromium? and when drawing a smooth line graph, do we have to pass out graph through the in-appropriate(the point which stands out of the smooth curve) point too? thanx.