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Explain how carbon monoxide is produced when petrol is burned in car engines. (2 marks)

Car petrol is usually some form of alkane, which has the general formula C n H 2n+2 . Let us assume we are using Butane (C 4 H 10 ). The desired chemical reaction for the complete combustion of butane is 2C ...
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Answered by Luc B. • Chemistry tutor
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A person swims from a depth of 0.50 m to a depth of 1.70 m below the surface of the sea. Density of the sea water = 1030 kg/m^3. Gravitational field strength = 9.8 N/kg. Calculate the increase in pressure on the swimmer. Give the unit.

We may use from the equation sheet, that p = h ρ g. Here, we are looking for a change in pressure, so one or more of the terms on the other side of the equation must be changing too. The question tells us th...
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Answered by Luc B. • Physics tutor
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What is osmosis and how does it work?

Osmosis is defined as the movement of water from an area of high water potential to an area of lower water potential, across a partially permeable membrane. This means that water molecules moves from a very ...
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Answered by Rebekah D. • Biology tutor
3677 Views

What makes a good argument in an essay or exam?

A good argument should consist of one clear, central idea that runs throughout your essay. This is important because you want to give a concise answer to the question. It should be simple enough that it can ...
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Answered by Alex H. • History tutor
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How does a skydiver reach terminal velocity?

At the start of the jump, the skydiver starts accelerating downwards due to his weight (force of gravity). There is a resultant force downwards as the weight is larger than the air resistance (weight>air ...
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Answered by Teodor N. • Physics tutor
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