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## gary's Content

There have been 535 items by gary (Search limited from 07-August 21)

### #49712 Books For Sale

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

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.

### #24168 2oo2 Paper 2 - Question 6

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

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

### #11530 Straight Line Geometry Problem

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

Find the equations of PS and QS

Hence find the oordinates of the fourth vertex S

Thanks for any help.

### #7916 Help With Questions

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

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?

### #16991 Circles and tangents

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

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.

### #23405 Recurrence Relations Help

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

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.

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