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What's the definition of osmosis?

Osmosis is the net movement of water from an area of high water potential to an area of lower water potential through a partially permeable membrane.An area of high water potential means there is less solute...
EJ
Answered by Emily J. • Biology tutor
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Describe the different forces upon a falling object with reference to Newton's first law.

A falling object will reach terminal velocity when the force draging it down (ie its weight due to gravity) is equal to the air resistance opposing the motion upwards. When the two forces are equal the objec...
AL
Answered by Adam L. • Physics tutor
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Why do skeletal formulae not show the hydrogens bonded to carbons but do on other elements?

Because carbon atoms have 4 electrons in their outer shell so always form 4 covalent bonds in a molecule, so the number of hydrogen atoms bonded can be inferred by subtracting however many bonds the carbon i...
MA
Answered by Megan A. • Chemistry tutor
3013 Views

Why do I have to study maths?

Maths is very important in real life. You use it day to day from basic addition and subtraction to working out percentage discounts in shops. Some of the more complex maths like algebra is used in fields lik...
JP
Answered by Jack P. • Maths tutor
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Expand and simplify (x-4)(2x+3y)^2

( x -4) x (2 x +3 y ) 2 (x-4) x (4x 2 +12xy +9y 2 ) 4x 3 +12x 2 y + 9xy 2 -16x 2 -48xy - 36y 2 finished.
JT
Answered by James T. • Maths tutor
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