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What is a mole?

A mole is a measure of quantity, such that when you have a mole of something, you have 6.02 x 10 23 atoms/molecules of it. The number of atoms/molecules in a mole is called "Avogadro's Number" and ...
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Answered by Amy F. • Chemistry tutor
2924 Views

Why do organs need to be 'matched'?

The antigens present on the cell surface membranes of organs are different from person to person due to genetic variation (leading to protein tertiary structure variation - remember antigens are proteins and...
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Answered by Frances E. • Biology tutor
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¿Hasta qué punto considera usted que los medios de comunicación afectan a los gobiernos? Comente.

Creo que los medios de comunicación afectan los gobiernos de una manera inmensurable. En las elecciones de 2016 en los estados unidos, los dos más grandes candidatos tienes problemas con medios de comunicaci...
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Answered by Megan M. • Spanish tutor
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In a fish and chips shop, the potatoes are cut hours before they are cooked, but they must not dry out. To stop this, the owner soaks them in a salt solution. Define the process of osmosis and explain what would happen if you used distilled water.

Osmosis can be described as the movement of water from a high concentration to a low concentration through a semi permeable membrane.In this example the salt solution has roughly the same concentration of wa...
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Answered by Vikram S. • Biology tutor
7501 Views

Differentiate the function y=4sqrt(x)

Can re-write function as y=4x 1/2 Then follow the standard steps for differentiating a power. Take the 1/2 down and multiply by the number in front of the x, in this case 4, to give 2. Now reduce the power w...
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Answered by Calum W. • Maths tutor
3805 Views