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Any Type of Doubts in ENg Phy Chem Bio or Math....Ask me here!!!

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Externals

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Hellow can you tell me what was the curve for 2012 M/J for Physics , Math , Eng. , Chemistry , Business Studies , and I.C.T !! All of them are (Extended accept the chemistry =P)
 
IGCESs monster

IGCESs monster

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this biolgy very good to study

(y)Like my posts and follow me if you think I helped.. god bless
 

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  • IGCSE Biology Notes.pdf
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halamadrid

halamadrid

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Does anyone here have answers for history and combined science? I'm desperate hahaha! Please? Thanks in advance! c:
 
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Jude Alsaadi

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There's something really confusing in the chemistry syllabus (0620): Section 2.2 (b) Methods of purification says: "*Describe methods of purification by the use of a suitable solvent, filtration, crystallisation, distillation..." I'm having trouble trying to figure out what is meant by "the use of a suitable solvent".
I found this document http://papers.xtremepapers.com/CIE/.../0620_sow_Unit_1__experimental_techniques.pdf which says that Typical solvents to use are water (salt/sand) or ethanol (salt/sugar). However, I still can't figure out how these are used as solvents to purify. This could possibly refer to Liquid-liquid extraction (http://en.wikipedia.org/wiki/Solvent_extraction) but I'm still not sure about this. I can't find any information in any of my textbooks. Any help would be really appreciated! I hope you all do well in M/J!
 
SIstudy

SIstudy

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Suitable solvent means if somethin can dissolve in tht perticular sustance
for eg, Lead Sulfate is insoluble in water and can be extracted by filtering it frm the mixture
while lead nitrate is soluble in water so can't be extracted by filtration, other method eg evaporation of water should be employed for its extraction
 
amany muhammed

amany muhammed

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people please can anyonr send me biology Answers June 1993 -- 2003 P1, 3, & 6.pdf pleasee
like seriously I need them
 
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Fatma Gahman

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Prathmesh Thakkar said:
All doubts welcomed..!!!!
Solution assured
Also der are some good notes down here.
n ofcourse some of the most challenging questions......
Click to expand...
9 Answer the whole of this question on a sheet of graph paper.
A taxi company has “SUPER” taxis and “MINI” taxis.
One morning a group of 45 people needs taxis.
For this group the taxi company uses x “SUPER” taxis and y “MINI” taxis.
A “SUPER” taxi can carry 5 passengers and a “MINI” taxi can carry 3 passengers.
So 5x + 3y 45.
(a) The taxi company has 12 taxis.
Write down another inequality in x and y to show this information. [1]
(b) The taxi company always uses at least 4 “MINI” taxis.
Write down an inequality in y to show this information. [1]
(c) Draw x and y axes from 0 to 15 using 1 cm to represent 1 unit on each axis. [1]
(d) Draw three lines on your graph to show the inequality 5x + 3y 45 and the inequalities from parts
(a) and (b).
Shade the unwanted regions. [6]
(e) The cost to the taxi company of using a “SUPER” taxi is $20 and the cost of using a “MINI” taxi is
$10.
The taxi company wants to find the cheapest way of providing “SUPER” and “MINI” taxis for this
group of people.
Find the two ways in which this can be done. [3]
(f) The taxi company decides to use 11 taxis for this group.
(i) The taxi company charges $30 for the use of each “SUPER” taxi and $16 for the use of each
“MINI” taxi.
Find the two possible total charges. [3]
(ii) Find the largest possible profit the company can make, using 11 taxis. [1] PLease help me Ill appreciate it
 
F

Fatma Gahman

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9 Answer the whole of this question on a sheet of graph paper.
A taxi company has “SUPER” taxis and “MINI” taxis.
One morning a group of 45 people needs taxis.
For this group the taxi company uses x “SUPER” taxis and y “MINI” taxis.
A “SUPER” taxi can carry 5 passengers and a “MINI” taxi can carry 3 passengers.
So 5x + 3y 45.
(a) The taxi company has 12 taxis.
Write down another inequality in x and y to show this information. [1]
(b) The taxi company always uses at least 4 “MINI” taxis.
Write down an inequality in y to show this information. [1]
(c) Draw x and y axes from 0 to 15 using 1 cm to represent 1 unit on each axis. [1]
(d) Draw three lines on your graph to show the inequality 5x + 3y 45 and the inequalities from parts
(a) and (b).
Shade the unwanted regions. [6]
(e) The cost to the taxi company of using a “SUPER” taxi is $20 and the cost of using a “MINI” taxi is
$10.
The taxi company wants to find the cheapest way of providing “SUPER” and “MINI” taxis for this
group of people.
Find the two ways in which this can be done. [3]
(f) The taxi company decides to use 11 taxis for this group.
(i) The taxi company charges $30 for the use of each “SUPER” taxi and $16 for the use of each
“MINI” taxi.
Find the two possible total charges. [3]
(ii) Find the largest possible profit the company can make, using 11 taxis. [1] PLease help me Ill appreciate it
 
Reem15

Reem15

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whats the difference between " write an article to your school magazine " AND "write an article to your local newspaper"? :cry:
 
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