Physics, Chemistry and Biology: Post your doubts here!

[princess sofia]

does any1 have any good notes to study cathode ray oscilloscope completly

 

[Abdelrahman magdy]

can anyone please provide some questions regarding mole calculations other than those found in past papers
help is surely appreciated

 

[Ifarts]

why detergents need to be biodegradable and why dont they form a scum????

BCOZ dey may be insol,so dey form scum. insolubilites wil make it less ready to wipe off and u know d global warming probs n bla bla if things r not degrading.................pippo, btw, dis aint in ig portion, scum n ol. itna bhi hodder mat padho. scum, sols, gels n ol ka section u read na? i read it too. intersting tha phir bhi

 

[Heba A.Moety]

refer this link!!
https://www.xtremepapers.com/commun...s-resources-discussions-and-much-moree.30924/

 

[Sweet!]

can anyone please provide some questions regarding mole calculations other than those found in past papers
help is surely appreciated

try solving the questions given in the textbook.
links for more questions and notes - http://www.bbc.co.uk/bitesize/higher/chemistry/calculations_1/mole/revision/1/
http://igcse.at.ua/IGCSE-Chemistry/THE-MOLE-CONCEPT.pdf
hope this helps

 

[ManalMansoor]

In biology, how do we know what to plot in which axis?

 

[Awesome12]

In biology, how do we know what to plot in which axis?

yes ofcourse. The independant variable is plotted on the x-axis, and the other one is plotted on the y-axis

 

[Heba A.Moety]

in Q4(a) what does lowering pressure in the chest has to do with the movement of lymph in lymphatic vessels?

 

[ManalMansoor]

yes ofcourse. The independant variable is plotted on the x-axis, and the other one is plotted on the y-axis

What does 'independent' variable mean?

 

[Abdelrahman magdy]

try solving the questions given in the textbook.
links for more questions and notes - http://www.bbc.co.uk/bitesize/higher/chemistry/calculations_1/mole/revision/1/
http://igcse.at.ua/IGCSE-Chemistry/THE-MOLE-CONCEPT.pdf
hope this helps

thanks a bunch these are really helpful notes

 

[Awesome12]

in Q4(a) what does lowering pressure in the chest has to do with the movement of lymph in lymphatic vessels?

View attachment 40366

There is no lymphatic vessels mentioned in (a) but it is mentioned in part (b)

 

[Awesome12]

What does 'independent' variable mean?

The variable that is not dependant on others. eg. time
When making up an experiment, you will measure something in intervals (eg. time can be measured as 5 s, 10 s, .etc). You will plot this always on the x-axis

 

[Heba A.Moety]

There is no lymphatic vessels mentioned in (a) but it is mentioned in part (b)

part (a) was about how lymph moves in lymphatic vessels

 

[Heba A.Moety]

can anyone tell me what does anaeroibc respiration has to do with nitares in reed beds. part (c) last point in ms!! plz some help over here

 

[My Name]

DEAR SUM 1
answer this plz make it look simple
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Biology (0610)/0610_s09_qp_6.pdf
Question 2 a (ii) is this correct?
there are arteries there will take blood
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Biology (0610)/0610_w09_qp_6.pdf
question 1 easy answer plz


BTW i am not that dumb to not know thses answer
im just scared wat if th examiner doesnot like my answer and sumtimes its hard to get the ms in bio

thanku in advance

 

[Awesome12]

DEAR SUM 1
answer this plz make it look simple
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Biology (0610)/0610_s09_qp_6.pdf
Question 2 a (ii) is this correct?
there are arteries there will take blood
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Biology (0610)/0610_w09_qp_6.pdf
question 1 easy answer plz

BTW i am not that dumb to not know thses answer
im just scared wat if th examiner doesnot like my answer and sumtimes its hard to get the ms in bio
thanku in advance

For the fist one, about the arteries that is correct, but the correct explanation is
At these places, the arteries are located very close to the skin

As for the second question, what specific part?

 

[My Name]

th

For the fist one, about the arteries that is correct, but the correct explanation is
At these places, the arteries are located very close to the skin

As for the second question, what specific part?

nx
and a (ii) nad b

 

[Awesome12]

th

nx
and a (ii) nad b

In the first stem, water has moved out of the stem, causing a loss in turgor. the thickest part is at the edge, and as it loses water, they contract achieving such a shape.
In the second one, water is moving in by osmosis, and exerts a force on the sides of the stem creating a turgor causing it to achieve such a shape

In the experiment keep various variables constant apart from changing the conc. of the salt solution. Tabulate the conc. and length of the stem after each trial and tabulate it, as well keep on continuing the experiment until you obtain the outcome you want

 

[My Name]

In the first stem, water has moved out of the stem, causing a loss in turgor. the thickest part is at the edge, and as it loses water, they contract achieving such a shape.
In the second one, water is moving in by osmosis, and exerts a force on the sides of the stem creating a turgor causing it to achieve such a shape

In the experiment keep various variables constant apart from changing the conc. of the salt solution. Tabulate the conc. and length of the stem after each trial and tabulate it, as well keep on continuing the experiment until you obtain the outcome you want

i like ur answer but are u sure this is enuf details

 

[♣♠ Magnanimous ♣♠]

i like ur answer but are u sure this is enuf details

this is enough.