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Write an equation for the complete combustion of C9H20

Complete combustion is the oxidation of a fuel where the only products exist as CO 2 and H 2 O. C 9 H 20 + nO 2 ==> nCO 2 + nH 2 O C 9 H 20 + 19O 2 ==> 9CO 2 + 10H 2 O use the molecular formula of the ...
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Answered by Harry F. • Chemistry tutor
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To what extent was fall of the USSR in the years 1985-1990 due to the ending of the Brezhnev Doctrine?

There were several reasons behind the collapse of the USSR in the 1980s, many of which were intertwined. While the ending of the Brezhnev Doctrine, and the subsequent collapse of the Communist regimes in the...
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Answered by Joe H. • History tutor
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Solve y=x^2 - 1, y=5 - x

x= -3, y= 8 and x= 2, y= 3 (1) 5 - x = x^2 - 1(2) x^2 + x - 6 = 0(3) (x+3)(x-2) = 0(4) when x = -3, y= 5 - (-3) = 8(5) when x = 2, y= 5 -(2) = 3
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Answered by Tamim B. • Maths tutor
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Explain the multi-store memory model

The multi-store memory model is a cognitive model which was designed by Atkinson and Shifrin (1968) which conceptualises the different stores of memory. It begins with the sensory store, which includes both ...
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Answered by Ellen P. • Psychology tutor
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"It is a test [that] genuine poetry can communicate before it is understood." - T. S. Eliot. Discuss this with reference to at least two poets you have studied.

This would be an example of a typical English Literature IB Higher Level Paper 2 essay question.The student should introduce their essay by analysing the quotation, perhaps considering the difference between...
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Answered by Iona R. • English tutor
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