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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 330503 times)

Offline mdwael

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1035 on: May 17, 2010, 01:05:50 pm »
http://www.freeexampapers.us/IGCSE/Chemistry/CIE/1993-2003/chemistry1993-2000answers.pdf

In this one at may/june 2000 answer 6 b what does O.I.M mean?
"fill the burette with O.I.M hydrochloric acid solution"
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6394

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1036 on: May 17, 2010, 01:10:20 pm »
m/j 2009 ques 4 e) 1)
????????????
n 1 more thing for the sam ques
the ms says dat "extrapolation shown"
wat do u mn by extrapolation shown
THNXXX
:)
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Offline Shazizzzle

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1037 on: May 17, 2010, 01:14:13 pm »
Quote from: 6394 on May 17, 2010, 01:10:20 pm
m/j 2009 ques 4 e) 1)
????????????
n 1 more thing for the sam ques
the ms says dat "extrapolation shown"
wat do u mn by extrapolation shown
THNXXX
:)

Extrapolation means you extend the curve forward, roughly till 70 deg. C, i.e extend it in the same direction roughly till it touches the end f the grid.
You use the approximate estimated result you get, using the graph, by showing your working lines. :)
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1038 on: May 17, 2010, 01:15:22 pm »
Quote from: 6394 on May 17, 2010, 01:10:20 pm
m/j 2009 ques 4 e) 1)
????????????
n 1 more thing for the sam ques
the ms says dat "extrapolation shown"
wat do u mn by extrapolation shown
THNXXX
:)

Shaizzzzle answered it? u want the whole q to be answered??
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6394

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1039 on: May 17, 2010, 01:17:31 pm »
Quote from: A@di on May 17, 2010, 01:15:22 pm
Shaizzzzle answered it? u want the whole q to be answered??
yup thnku
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Offline Shazizzzle

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1040 on: May 17, 2010, 01:19:03 pm »
Quote from: A@di on May 17, 2010, 01:15:22 pm
Shaizzzzle answered it? u want the whole q to be answered??

Just three 'z's will do. :P No need for the fourth ;)
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1041 on: May 17, 2010, 01:24:05 pm »
a) Just read the temperature from the thermometer and write it in the box. Easy 'nuff. FOr the average add the initial and final and divide the sum by 2.

b) Use the last 2 columns from the table to plot the curve. Remember it should be a smooth curve.

ci) Experiment 5
cii) As the temperature is highest, the particles will have more energy and thus will move faster to increase the number of collisions.

d) To obtain fair result by keeping the variables constant.

e)i) Shaizzzle answered it.

eii) New curve should be lower than the original curve as more concentration will reduce the time for printed text to disappear.

@Shaizzzle - LOL, K, :P

f) Use insulation

    Reduce Heat loss.
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6394

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1042 on: May 17, 2010, 01:40:11 pm »
m/j 2009 ques 4 f
the mark scheme says use of data logger/colourimeter
wats dat ????
Thanks
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1043 on: May 17, 2010, 01:43:08 pm »
for bar graphhs


DO WE LEAVE  1 SPACE B4 THE FIRST AND 1 BETWEEN EACH 1?
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6394

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1044 on: May 17, 2010, 01:44:20 pm »
Quote from: A@di on May 17, 2010, 01:24:05 pm
a) Just read the temperature from the thermometer and write it in the box. Easy 'nuff. FOr the average add the initial and final and divide the sum by 2.

b) Use the last 2 columns from the table to plot the curve. Remember it should be a smooth curve.

ci) Experiment 5
cii) As the temperature is highest, the particles will have more energy and thus will move faster to increase the number of collisions.

d) To obtain fair result by keeping the variables constant.

e)i) Shaizzzle answered it.

eii) New curve should be lower than the original curve as more concentration will reduce the time for printed text to disappear.

@Shaizzzle - LOL, K, :P

f) Use insulation

    Reduce Heat loss.
m ssoooo sorrryyyyy 2 waste ur tym  :-\
actually i jus wantd que 4 e 1 and 2
sOOORRRRRYYYY 1ce agn
n Thanks
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6394

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1045 on: May 17, 2010, 01:47:42 pm »
Quote from: Kimo Jesus on May 17, 2010, 01:43:08 pm
for bar graphhs


DO WE LEAVE  1 SPACE B4 THE FIRST AND 1 BETWEEN EACH 1?
btwen each 1 u have 2 leave
dunno abtt b4 the first 1
which yr did u fynd this ques
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1046 on: May 17, 2010, 01:48:56 pm »
Quote from: 6394 on May 17, 2010, 01:47:42 pm
btwen each 1 u have 2 leave
dunno abtt b4 the first 1
which yr did u fynd this ques
not sure ..a freinds question...



I NEED TO KNO DO WE LEAVE A SPACE B4 THE FIRST BAR IN A BAR GRAPH
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Offline Shazizzzle

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1047 on: May 17, 2010, 01:49:41 pm »
Quote from: Kimo Jesus on May 17, 2010, 01:43:08 pm
for bar graphhs


DO WE LEAVE  1 SPACE B4 THE FIRST AND 1 BETWEEN EACH 1?

Umm, yes the bars have to be separate.
But it depends on the number of boxes given on the x axis.

If, for example you have to plot 5 experiments, and they give you 5 big boxes, then leave blank, one small box from either side of the bar, even the first, so you are infact using the middle 8 small boxes for each bar. :)
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1048 on: May 17, 2010, 01:52:23 pm »
Quote from: Shazizzzle on May 17, 2010, 01:49:41 pm
Umm, yes the bars have to be separate.
But it depends on the number of boxes given on the x axis.

If, for example you have to plot 5 experiments, and they give you 5 big boxes, then leave blank, one small box from either side of the bar, even the first, so you are infact using the middle 8 small boxes for each bar. :)

ok cheers thank you
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NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa

Offline High-R

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1049 on: May 17, 2010, 02:04:32 pm »
Quote from: ~VIN1094~ on May 17, 2010, 08:38:48 am
used as an indicator .. to check the presence of iodine .. solved this one yest ;)
its used as an indicator...to check presence of starch!!..not iodine...
...... :P
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