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#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?



#30171 explanations

Posted by gary on 30 May 2005 - 10:06 AM in Chemistry

In the physics exam there were a lot of explanations. what type of explanations could be in the exam tomorrow.



#19435 Poetry...

Posted by gary on 16 April 2005 - 03:13 PM in English

The only poem I am familiar with there is "Visiting Hour", however, don't do that. There were markers at my school this past week and my teacher said that is one a large number of people do and do badly so I would avoid.



#23646 2001 Paper 1 Q. 10

Posted by gary on 16 May 2005 - 01:34 PM in Problem Questions

Thats for paper 2.



#10580 Quadratics Questions

Posted by gary on 04 December 2004 - 10:54 AM in Mathematics

R = 50x - x2 - 475

Rewrite R in the form a(x-p)2 + q by completing the square. stating the values of a,p and q clearly.

Hence state the maximum value of R and the corresponding value of x.


Complete the square on the expressions -x2 - 4x + 1

Hence show that, for the curve with the equation y= -1/3xcubed - 2xsquared + x -7, the gradient of the tangent cannot be greater than 5.

State the value of x for which the gradient of the tangent equals 5.

Thanks for any help.



#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?



#49478 Grade Boundaries 2005

Posted by gary on 15 August 2005 - 07:31 PM in History

I got a band 3 so I'm pretty sure I got 64% biggrin.gif



#9265 Differentiation

Posted by gary on 14 November 2004 - 03:18 PM in Mathematics

Thanks for helping me with this, I think the bit I got stuck at was.

x3 = 8000
x = 20

How do you get 20 from that?



#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.



#27708 1995 and 1996 Multi Choice Questions

Posted by gary on 25 May 2005 - 10:47 AM in Chemistry

Yeah I would like any old multiple choice papers but no one will tell me where to get them and the school wont give me any.



#25176 Help

Posted by gary on 19 May 2005 - 06:47 PM in Mathematics

It is g(f(x)) sorry.



#27755 1995 and 1996 Multi Choice Questions

Posted by gary on 25 May 2005 - 12:21 PM in Chemistry

I can't pester them any more the school is closed apart from exams.



#25174 Help

Posted by gary on 19 May 2005 - 06:43 PM in Mathematics

I thought it was differentiation just had not seen it like that before.

Thanks.



#49458 Grade boundries 2005

Posted by gary on 15 August 2005 - 07:07 PM in Physics

38% for a C I knew it wouldn't go anywhare near 50%.



#24125 LOGS!

Posted by gary on 17 May 2005 - 08:04 PM in Mathematics

log base 2 3

let x = log base 2 3

then 2 power x = 3

log e 2 power x = log e 3

x= ln3/ln2

I'm sorry if you can't understand this I can't get to work the icon thingys.

Basically you use this method for the first three.



#10664 Help With Questions

Posted by gary on 05 December 2004 - 02:00 PM in Chemistry

Thank You tongue.gif



#10578 Help With Questions

Posted by gary on 04 December 2004 - 10:46 AM in Chemistry

Which of the following is not true about benzene?

A It can decolourise bromine water
B All of the c-c bond lengths are equal
C It does not really undergo addition reactions
D The electrons in benzene are delocalised

When ethylbenzene is converted to phenylethene what is the reaction called?

A Reduction
B Dehydrogenation
C Dehydration
D Polymerisation
E Reforming

A compound C7 H12 02 reacts with sodium carbonate solution liberating carbon dioxide gas, and it also decolourises bromine water rapidly. What would be its structural formula.

The next two questions might be hard to understand as they are one of the grid questions.

How is and alcohol H-C-C-O-H produced from CH2 double bond CH2?

How would you convert and alcohol H-C-C-O-H into an addition bromine reaction (2 steps required)

Thanks for any help.



#7701 Help with recurrence relations question

Posted by gary on 21 October 2004 - 06:27 PM in Mathematics

Thank You tongue.gif



#7697 Help with recurrence relations question

Posted by gary on 21 October 2004 - 05:17 PM in Mathematics

A residential home for elderly people has been investigating the performance of two different makes of Cleaner to use daily on the shower bases.
of the harmful

''Aquatec''was found to kill 98 percent of the harmful Bacteria present but another 2450 new Bacteria appeared daily.

''Magiclean'' was found to kill 96 present but another 2400 new Bacteria appeared daily.

Compare the effectiveness, in the long-term, of these two products as far as the eradication of harmful bacteria is concerned.



#16051 Extended Essay Question

Posted by gary on 13 March 2005 - 02:06 PM in History

What is the maximum amount of words that an essay can have.

My essay is currently at 2,000 words and my teacher still wants me to add in stuff about the Anschluss and the Czech Crisis. If I do this my essay will most likely go to about 2,500 which I think is far too much.



#16127 Extended Essay Question

Posted by gary on 14 March 2005 - 04:16 PM in History

I managed to complete the whole essay last year which was suprising.



#24127 LOGS!

Posted by gary on 17 May 2005 - 08:08 PM in Mathematics

2 = 1000

x log base 10 2 = logg base 10 1000

x= log base 10 2/log base 10 1000



#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.



#25161 Help

Posted by gary on 19 May 2005 - 06:09 PM in Mathematics

I can't get the answers to these:

The function x^3-3x+2

find the co-ordinates of a,b,c

find the coordinates of the stationary point d and confirm its nature.




The functions f and g are given as:

f(x) = 4/x-2 and g(x) x+2

what is g(f(x))

Two functions, f and g are definded as follows:

f(x) = x-1 g(x) 1/x^2-1

find g(f(x)



#6886 Help!

Posted by gary on 09 October 2004 - 09:28 AM in Chemistry

Hey,

Can someone help me with these questions please:

An element has the electron arrangement 2,8,18,18,8,2

What will the main type of bonding be between its atoms?

Why does this electron have a higher boiling point thatn its neighbour with an electron arrangement 2,8,18,18,8,1?


CH4 and CF4 are both polar molecular compounds in which the moclecules both have the same tetrahedral shape.

Which would you expect to have the higher boiling point and why?

The HCF3 molecule also has a tetrahedral shape and its boiling point is higher than that of CH4 and CF4. Suggest a reason for this.


Silicon dioxide and carbon dioxide have similar names and similar formulae. Yet these two compounds are very different in their properties.
Explain in terms of bonding and structure why silicon is a high melting point solid and carbon dioxide is a gas at room temperature.

SiO2 CO2