# Physics, Chemistry and Biology: Post your doubts here!

#### kiran kk

Electromagnetism Unit Doubt!

Can someone mention the answer and why?

I always find it difficult to solve physics atp... Could you provide me some tips fr help?

#### ❤Nouran❤

what is the difference between combustion and burning?.
And which one is an exothermic reaction?.

#### ❤Nouran❤

Electromagnetism Unit Doubt!

Can someone mention the answer and why?

View attachment 65042
(i) Fig.10.3 the coil is perpendicular to the magnetic field , so the e.m.f is at its maximum
(ii) Fig.10.1 as the coil is parallel to the magnetic field, thus no e.m.f is produced

#### ❤Nouran❤

Is neutralisation endothermic or exothermic?

exothermic

#### nitin5237

Q: A cyclist travels along a horizontal track at constant speed. The work done by the cyclist is equal to :

can I pls get the answer

#### kiran kk

How to solve 3B??

#### ❤Nouran❤

I am not really sure but I guess we should add their masses (as they will be joined together) and then divide 0.16 (as momentum before the collision is equal to the momentum after the collision) by 0.8 (the sum of their masses) to get the speed(velocity) to be 0.2m/s

#### Agent 47

Hello everyone, I need some help, can anyone please give me notes for Physics, Chemistry and Biology, thanks

#### ❤Nouran❤

View attachment 65163
View attachment 65164
View attachment 65165

mole=volume x concentration
volume=mole x 24

4(c)(i) 0.002 (mol); 0.1 x 0.02dm3 (e.g 20cm3/1000)
4(c)(ii) 0.001 (mol); 0.002/2 (becuz its 2H2O2:1O2 SO 2:1)
4(c)(iii) 0.024 (dm3); 0.001 x 24
4(c)(iv) no change/ no effect; (as catalysts don't affect equilibrium and thus the volume of the reactants-it just speeds up the reaction)
4(c)(v) 0.048 (dm3 ); 0.024 x 2 (as concentration is doubled )-e.g 0.1mol/dm3 x 2 = 0.2 mol/dm3

Hope it helps
Good luck!

#### ❤Nouran❤

Hello everyone, I need some help, can anyone please give me notes for Physics, Chemistry and Biology, thanks
Here are some I use. Hope they r beneficial

#### Attachments

• cie-igcse-physics-0625-theory-v4-znotes.pdf
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• cie-igcse-chemistry-0620-theory-v2-znotes.pdf
5.7 MB · Views: 62
• cie-igcse-biology-0610-theory-v2-znotes.pdf
6 MB · Views: 61

#### Agent 47

Here are some I use. Hope they r beneficial
thank you very much sir I really appreciated, god bless you

#### Agent 47

mole=volume x concentration
volume=mole x 24

4(c)(i) 0.002 (mol); 0.1 x 0.02dm3 (e.g 20cm3/1000)
4(c)(ii) 0.001 (mol); 0.002/2 (becuz its 2H2O2:1O2 SO 2:1)
4(c)(iii) 0.024 (dm3); 0.001 x 24
4(c)(iv) no change/ no effect; (as catalysts don't affect equilibrium and thus the volume of the reactants-it just speeds up the reaction)
4(c)(v) 0.048 (dm3 ); 0.024 x 2 (as concentration is doubled )-e.g 0.1mol/dm3 x 2 = 0.2 mol/dm3

Hope it helps
Good luck!
Thank you very much sir, for helping me again, god bless you

#### Agent 47

hey guys need some help in this question, thanks in advance

#### Agent 47

and how do we do this too, thanks is advance

#### Agent 47

and suggestion for this question, well thanks in advance

#### azfarhassan772

All the circled questions

#### Attachments

• 20200218_004107.jpg
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