CHEM AND BIO HELP AND TIPS HERE

[The Golden Girl =D]

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 ,an insect
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

7.how to detect transpiration (place a plastic bag on the plant ,water will condense)
8.effect of cutting roots of a seedling (wilts when cut , when not cut is healthy and upright)
9.effect of cutting roots of a plants on it's water uptake
10.u gotta what a bill jar is and thatit's used for testin for breathing
11. test for the different scents of plants and the effect of it on attracting insects (i wanna describe the exp but it's too long and i'm busy . sooo google it or smthn , k?)
12.test for the effect of colour of petal of a flower on the attracting of insects (google this too! )
13.exp on pulse rate of a runner and person whose not doin excersice
14.testin of carbon dioxide, and oxgen
15.test of finding the reaction time of a person
16.tests abt the effect of auxin on phototropism, and Geotropism

later

[haris94]

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?

k Thanks

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

o i c
yea that makes sense
Thanks   +rep

[6394]

question 4 h <p6 chem 2006 o/n> can we ryt dat the initial emp shud be same
                                              and abt room temp.

[6394]

question 4 h <p6 chem 2006 o/n> can we ryt dat the initial emp shud be same
                                              and abt room temp.

temp*

[WARRIOR]

question 4 h <p6 chem 2006 o/n> can we ryt dat the initial emp shud be same
                                              and abt room temp. for more accurate results

well i checked mark scheme and its no..to be honest every time i see measuring cyilnder..first thing that comes in my mind is use burette for more accurate measuring of liquind cz measuring cyl has 0.5 error and buret ha 0.05..

[Shazizzzle]

WHENEVER The question refers to MEASURING CYLINDER, the answer to the improvements is ALWAYS, USING A BURETTE OR PIPETTE FOR MORE ACCURATE AND RELIABLE READINGS.

WHENEVER The question refers to TIME BEING TAKEN, the improvements are A DIGITAL STOP WATCH OR A DATA LOGGER.

[omair]

on 2007 p6 Q 4d
                                 fast please

[WARRIOR]

m/j or o/n?

[princess12]

on 2007 p6 Q 4d
for biology or chemistry

[6394]

well i checked mark scheme and its no..to be honest every time i see measuring cyilnder..first thing that comes in my mind is use burette for more accurate measuring of liquind cz measuring cyl has 0.5 error and buret ha 0.05..

Thanks alot

[WARRIOR]

adn oct/ nov or m/ j

[princess12]

on 2007 p6 Q 4d
for bio or chem
 
reply me fast urgent reply
 

[6394]

WHENEVER The question refers to MEASURING CYLINDER, the answer to the improvements is ALWAYS, USING A BURETTE OR PIPETTE FOR MORE ACCURATE AND RELIABLE READINGS.

WHENEVER The question refers to TIME BEING TAKEN, the improvements are A DIGITAL STOP WATCH OR A DATA LOGGER.

thnk u
data logger?

[Fastal]

whats a colourimeter thing? is it like a data loggeror colour comparer

[Vin]

i dont think colourimeter is a data logger .. colourimeter si a device measures the absorbance of wavelengths of light by a specific given solution. we hav it in our lab .. jus a small thing (looks lik a weighing scale without the plate) has a hole where a test tube can fit in .. had almost forgotten abt it !!

data logger records data over time .. thts wat i remember .. =\