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#29287 1996 paper 2 q16

Posted by gary on 27 May 2005 - 06:57 PM in Chemistry

Help.



#49712 Books For Sale

Posted by gary on 16 August 2005 - 02:23 PM in Chemistry

Revision:

Leckie and Leckie Questions In Higher Chemistry
Leckie and Leckie Questions In Higher Chemistry
Chemcord Revision Notes For Higher Chemistry
Chemcord Revision Notes For Higher Chemistry

If you want to buy any of these just post here and I will arrange payment.



#28929 Old course

Posted by gary on 27 May 2005 - 11:11 AM in Chemistry

what are the things that the old course had which were in old past papers such as 1999.



#30373 solubility

Posted by gary on 30 May 2005 - 04:39 PM in Chemistry

what do you need to know im confused.



#30170 1997 paper 2 q. 3

Posted by gary on 30 May 2005 - 10:04 AM in Chemistry

that is why im stuck then.

thanks.



#30168 1997 paper 2 q. 3

Posted by gary on 30 May 2005 - 10:00 AM in Chemistry

Stuck at this can anyone help.



#24168 2oo2 Paper 2 - Question 6

Posted by gary on 17 May 2005 - 09:10 PM in Mathematics

Firstly you do:

Y= 2 sin (pie/3 - pie/6)
= 2 sin (pie/6)
= 2x0.5
= 1

point (pie/3,1)

Then

differentiate

2 cos(pie/3 - pie/6)
2 cos(pie/6)
2xroot 3/2
root 3

then using y-b=m(x-a)

y-1 = root 3(x-pie/3)
y-1 = root 3x - root3pie/3



#29286 1996 paer 2 q. 15 c

Posted by gary on 27 May 2005 - 06:56 PM in Chemistry

How do you do this?



#30131 reflux condenser

Posted by gary on 30 May 2005 - 01:01 AM in Chemistry

can someone please explain this.



#49716 Books For Sale

Posted by gary on 16 August 2005 - 02:26 PM in History

Past Papers:

Higher History 2000-2005

If you want to buy any of these just post here and I will arrange payment.



#49715 Books For Sale

Posted by gary on 16 August 2005 - 02:25 PM in English

Past Papers:

Higher English 2001-2005

Revision:

Leckie and Leckie Higher English Course Notes

If you want to buy any of these just post here and I will arrange payment.



#11530 Straight Line Geometry Problem

Posted by gary on 21 December 2004 - 07:18 PM in Mathematics

P,Q,R and S have coordinates (13,5) (3,7) and (5,-3) respectively and are three vertices of a rhombus PQRS.

Find the equations of PS and QS

Hence find the oordinates of the fourth vertex S

Thanks for any help.



#15895 Equilibrium

Posted by gary on 07 March 2005 - 08:59 PM in Chemistry

I am finding this very difficult to understand.

What are the basic facts you need to know.

What are the type of questions asked in exams.

Thanks to anyone who helps.



#49713 Books For Sale

Posted by gary on 16 August 2005 - 02:24 PM in Physics

Revision:

Leckie and Leckie Higher Physics Course Notes
Leckie and Leckie Questions In Higher Physics
Chemcord Revision Notes For Higher Physics

If you want to buy any of these just post here and I will arrange payment.



#31083 Thanks :)

Posted by gary on 31 May 2005 - 06:07 PM in Chemistry

Thanks helped me so much this year.



#7940 Help With Questions

Posted by gary on 24 October 2004 - 03:58 PM in Chemistry

Thanks again. tongue.gif



#7916 Help With Questions

Posted by gary on 24 October 2004 - 09:54 AM in Chemistry

The mass of one mole of aluminium is 27g.
What is the mass of one aluminium atom?

What volume of Carbon dioxide is produced when 10cm3 of ethane is burnt in pure oxygen?

What volume of hydrogen is produced when 2g of magnesium reacts with excess hydrochloric acid according to the equation (assume the molar volume is 24 litres)

The combustion of ethan can be summarised by the equation

C2H6(g) = 3 1/2 02(g) gives 2CO2(g) + 3H20(g)

If air is 20%, by volume of oxygen how much air is needed to completely burn 10 litres of ethane?



#9198 Multiple Choice

Posted by gary on 12 November 2004 - 05:12 PM in Chemistry

I think all schools do them.

I got 11/13
8/13
8/13



#30368 foru marker for extended answer

Posted by gary on 30 May 2005 - 04:38 PM in Chemistry

someone mentioned this?

what is it about?



#30388 foru marker for extended answer

Posted by gary on 30 May 2005 - 04:59 PM in Chemistry

Right the one about acids and equilibrium etc.

What other types of things could be asked for this?



#30522 foru marker for extended answer

Posted by gary on 30 May 2005 - 07:44 PM in Chemistry

Some tips on what this could be would be good.



#18801 Marking schemes!

Posted by gary on 11 April 2005 - 09:06 PM in English

Yeah teachers in my school always say you can fail one of your essays even both if you do really well in close reading.



#16991 Circles and tangents

Posted by gary on 26 March 2005 - 08:02 PM in Problem Questions

Would you not just substitute the 6 into the k.

Rearrange the equation x-3y = 6 which would give you x = 3y+6.

Then substitute equation 1 into 2.

Simple from there on the values should work out to 0 if you use the descriminant and equal if you use it the other way.

I don't understand what part b is asking.



#30389 2002 - Written Paper - Q14(a)

Posted by gary on 30 May 2005 - 05:02 PM in Chemistry

Q=It
Q=0.97 c

2I-(aq) ---> I2 (aq) + 2e-

2mol Iodine is deposited by 1 faraday

so 2x96500=193000c

0.97/193000 x 126.9

= 5.025x10 -6 moles



#23405 Recurrence Relations Help

Posted by gary on 15 May 2005 - 02:31 PM in Problem Questions

Keep getting the wrong answer to this:

A drug in the body dissipates at the rate of 12% during each 10 minute period from the initial treatment.

If an initial does of 50 units is given how much of the does will be present in a patients boodstream after 1 hour.