CHEM AND BIO HELP AND TIPS HERE

[High-R]

heyyyy
nid404....canu pleease tell me...watever is important for bio ppr6??...like PLZ tell which CHAPTERS???
....and i need u to tell tht wats important in homeostasis...hormones and drugs..like which (hormones and drugs)......like how u have explained so nicely about tht lymphatic system previously...do explain me 2 !!...atleast briefly..but do putline the really imortant things.
.....Thanks SOO MUCH!!!!...awaitin ur reply!!
...  ....

[The Golden Girl =D]

heyyyy
nid404....canu pleease tell me...watever is important for bio ppr6??...like PLZ tell which CHAPTERS???
....and i need u to tell tht wats important in homeostasis...hormones and drugs..like which (hormones and drugs)......like how u have explained so nicely about tht lymphatic system previously...do explain me 2 !!...atleast briefly..but do putline the really imortant things.
.....Thanks SOO MUCH!!!!...awaitin ur reply!!
...  ....

i'll tell u what's impo in bio paper 6

1. the classification chapter
2.experiments on germination (effect of water,temp,oxgen on germination)
3.experiments on the factors of photosynthesis (light, carbon dioxide,temperature )
4.differences between monoct and dicot plants
5.labellings for a flower,a snail,a seed
6.u should kno what kind of imporvements to make in eeach experiment there is in the paper but reading the table and question twice cuz the answer is there .( i wanna tell u more but i am too busy to type more)

those r mostly what my tutor told me
gd luck

[6394]

i'll tell u what's impo in bio paper 6

1. the classification chapter
2.experiments on germination (effect of water,temp,oxgen on germination)
3.experiments on the factors of photosynthesis (light, carbon dioxide,temperature )
4.differences between monoct and dicot plants
5.labellings for a flower,a snail,a seed
6.u should kno what kind of imporvements to make in eeach experiment there is in the paper but reading the table and question twice cuz the answer is there .( i wanna tell u more but i am too busy to type more)

those r mostly what my tutor told me
gd luck

INSHAALLAH 2 UR SIGNATURE

[6394]

any 1 help in q 3 d and e full part
plsss
<p6 chem m/j 2006>

[High-R]

Thanks "the golden girl".....
.......thts really helpful of u...
....and ya when u get type plz do.........tell me others too...ill keep checkin !!...Thanks!!!
 

[K_M]

yes the solvent always deends on what u are extracing.. and in this case its not water ! cz it tells you in the question that its isnoluble in water..so what you say is..use suitable solvent which dissolves the pigments..and explaint hte chromatofrphy process..



it says ignore water and heat cz its insoluble in water..altho i think heating with the SUITABLE SOLVENT should work..but anyway if u write that you dont get marked down i guess..so pestle adn morart is enough for crushing.

i hhave no idea what teh sand is for ? probably like filtering water...you put pigments in solvent and put it in sand and the insoluble stuff wont penetrate?

the sand is used to help break the leaf cells so that the leaf extract comes out while crushing and you can carry out the chromatography

[K_M]

||Exothermic Reactions:
1) When Dilute hydrochloric acid reacts with sodium hydroxide solution a neutralistation reaction happens
2)All Displacement Reactions :
     Mg + H2SO4 ----->  MgSO4 + H2
3) Combustion

||Endothermic Reactions:
1) N2 + 02 -----> 2NO
(dunno what is it called but thats whats written in the book)
2)Thermal Decomposition:
    Ca(OH)2  ----->  CaO + H20
    2Cu (NO3)2  ------> 2CuO + 4NO2 + O2
3) Melting of ice and evaporation of water
(yes, you probably thought it was exo like me, but it turned out to be endo)

isnt bond formation exothermic?! because im quite sure bond breaking is exothermic. And if thats right then how is it that N2 + O2 ---> 2NO is endothermic becuase is a bond formation!
Are all reactions with water endothermic or exothermic?

[Hesham Mhd]

I've got a question > Outline and explain the likely effects of deforestation? Thanks

[WARRIOR]

for b when ammonium chloride is warmed, it gives out ammonia and HCl

NH₄Cl----> NH₃ + HCl

do you get it now...?

NH3 turns red litmus blue(basic)
HCl turns blue litmus red (acidic)

ooh i see ! thanks man

[Mathewness]

I've got a question > Outline and explain the likely effects of deforestation? Thanks

• No trees = No soil anchors which means the soil will just run off into rivers. Level of water in river rises .... floods happen.
• Carbon dioxide levels increase in the atmopshere
• Loss of habitat[/i]
  

I cant think of more right now  

[Vin]

www.google.com =P

Less rain
Soil erosion
loss of trees, habitats, animal life

[Mathewness]

isnt bond formation exothermic?! because im quite sure bond breaking is exothermic. And if thats right then how is it that N2 + O2 ---> 2NO is endothermic becuase is a bond formation!
Are all reactions with water endothermic or exothermic?

Bond breaking is endothermic because the molecules are using energy from the surroundings to 'break' their bonds.
Bond forming  is exothermic because of a reason, which im not quite sure is relevant to IGs... two molecules start off at a higher energy. When they bond together, they become more stable and release energy.

[Fastal]

I've got a question > Outline and explain the likely effects of deforestation? Thanks

Increased soil erosion
Increased global temperatures as CO₂ increases
leading to increase sea levels
loss of habitat
desertification

[WARRIOR]

Bond breaking is endothermic because the molecules are using energy from the surroundings to 'break' their bonds.
Bond forming  is exothermic because of a reason, which im not quite sure is relevant to IGs... two molecules start off at a higher energy. When they bond together, they become more stable and release energy.

it is very relevant for igs infact!

imagine the melting point adn heating point graph    http://www.gcsescience.com/Graph-Temperature-Time-Substance.gif

when water is melting heat energy is given into the molecules so they can seperate adn BRAKE..therefore you putting energy in..ENDOTHERMIC REACTION..! u use energy to brake the bonds and not to heat the water and so thats why the gradient is flat at melitng point..


now imagine the water  vapour condensing !! at the boiling point..why is it flat?  because it stops loosing heat for a while and that is becausse it is forming bonds !! formng bonds is exothermic..energy is released to form bonds !! tahts why temp stop rising !

[The Golden Girl =D]

Thanks "the golden girl".....
.......thts really helpful of u...
....and ya when u get type plz do.........tell me others too...ill keep checkin !!...Thanks!!!
 

ya , i'll do my best inshAllah.