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What is the difference between a nucleophile and an electrophile?

A nucleophile is a molecule or ion that donates a pair of electrons to form a new covalent bond. It is strongly attracted to a region of positive charge. Common nucleophiles include hydroxide ions; due to th...
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Answered by Liam M. • Chemistry tutor
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What is a mole?

A mole is a unit of measurement for the amount of a substance. One mole is 6.02 x 10^23 particles in a substance, known as Avogadro's constant. This is because this is the number of atoms in 12g of Carbon- 1...
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Answered by Liam M. • Chemistry tutor
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What is an enzyme?

An enzyme is known as a biological catalyst. This is because they can speed up reactions by providing an alternative pathway, lowering the activation energy of the reaction. They are normally composed of a p...
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Answered by Liam M. • Biology tutor
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A curve has equation y = 2x^5 + 5x^4 1 . (a) Find: (i) dy/ dx [2 marks] (ii) d^2y/ dx^2 (b) The point on the curve where x ¼ 1 is P. (i) Determine whether y is increasing or decreasing at P, giving a reason for your answer.

a.) dy/dx+10x^4+20x^3 d^2y/dx^2=40x^3+60x^2 b.)sub in x=-1 to dy/dx=10(-1)^4+20(-1)^3 =-10 therefore, decreasing
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Answered by Alexandra F. • Maths tutor
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How are X-Rays produced?

X-Rays are a form of electromagnetic radiation similar to gamma radiation except X-Rays are produced when an electron is slowed down from a high velocity and gamma waves are produced from radioactive materia...
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Answered by Lewis S. • Physics tutor
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