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The equation for the reaction of carbon and nickel dioxide is: NiO + C ----> CO + Ni Calculate the percentage atom economy of this reaction to produce nickel to 3 significant figures.

Using a periodic table, you can find that: Molecular mass of carbon: 12Molecular mass of nickel: 59Formula mass of nickel oxide: 75 (=59+16) Mass of all the reactants = 12+75=87Mass of the product we want (n...
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Answered by Emma N. • Chemistry tutor
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What is a rhetorical question

A rhetorical question is a question you ask someone, but you do not expect or need an answer. Often you know the answer to the question already. They are often used in emotive writing to emphasise particular...
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Answered by Maddie M. • English tutor
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Expand (x+3)(x+2)

(x+3) (x+2)=F=x x= x^2O=x 2=2xI=3 x=3xL= 3*2=6=x^2 + 2x + 3x + 6= x^2 + 5x + 6
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Answered by Nicola S. • Maths tutor
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Solve the simultaneous equation: 3x+2y=8 and 2x+5y=-2

3x+2y=8 (1)2x+5y=-2 (2)So you need to have a common multiple of either x or y in this example I’ll equate the x of both equations so I’ll multiply (1) by 2 and (2) by 3 2( 3x+2y=8). 6x+4y=16 (3).3(2x+5y=-2) ...
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Answered by Rabia D. • Maths tutor
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Describe the process of osmosis in cells.

Water molecules move down their concentration gradient, across the partially permeable cell membrane, from a high concentration to a low concentration. Osmosis continues until the concentration of water mole...
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Answered by Aoife M. • Biology tutor
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