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What is a mole?

Rather than the furry creature, in chemistry a mole is a unit used to measure substances. Its equivalent to 6x10 23 atoms, the number of carbon atoms in 12g of carbon. To find a mole of a substance we use th...
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Answered by Jessica D. • Chemistry tutor
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Explain why Aluminium and Sulfur do not fit the expected trends of first ionisation energies of period 3?

Firstly, we should define the first ionisation energy The first Ionisation Energy is the energy required to remove one mole of electrons from one mole of gaseous atoms to form a mole of gaseous ions, each wi...
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Answered by Jake G. • Chemistry tutor
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Explain how electricity is conducted through a metal. To gain full marks your answer must include a description of the structure and bonding in a metal.

Metals can be described as a lattice of close-packed positive ions in a sea of delocalised electrons. Because the electrons are delocalised, they can move freely through the metal.
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Answered by Andrew B. • Chemistry tutor
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Identify the dehydration product or products of a) ethanol, b) button-2-ol

Dehydration is a process in which an alcohol loses a molecule of water and leaves behind an alkene. The OH group is removed along with an H from any adjacent carbon atom. To work out the answer, firstly draw...
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Answered by Andrew B. • Chemistry tutor
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What is le Chatelier's principle?

Le Chatelier's principle states that a reaction at equilibrium will shift it's position of equilibrium in order to oppose any changes to it's environment. So if your reaction is exothermic, and you cool your...
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Answered by Chris M. • Chemistry tutor
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