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What chemical test can be used to differentiate between alkenes and alkanes. Describe and explain the results.

Alkenes decolourise bromine water (orange/brown to colourless) while alkanes cause no change in colour. An electrophilic addition reaction occurs with the alkene. In a reaction between ethene and bromine wat...
SE
Answered by Sito E. • Chemistry tutor
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why does graphene conduct electricity?

usually covalent structures cannot conduct electricity but graphene is one of the exceptions and this is due to its structure and bonding. It is a giant covalent 2D molecule, hexagonal in shape with 3 covale...
CN
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State the reagents and conditions for the formation of an aldehyde, starting from a primary-alcohol.

Answer: Heat with acidified potassium dichromate (IV), distilling off the aldehyde as it forms. Explanation: To form an aldehyde from an alcohol the alcohol group must be oxidised. To do this we use potassiu...
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Answered by Tom O. • Chemistry tutor
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Use the concept of electronegativity to justify why the acid strengths of ethanedioic acid and ethanoic acid are different. (6 marks)

Stage 1: 1-2 marksFirstly, draw and explain the difference in structures between the two acids. Stage 2: 3-4 marksThe unionised COOH groups in the ethanedioc acid contain two very electronegative oxygen atom...
LH
Answered by Lima H. • Chemistry tutor
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The reversible reaction 2 SO2 (g) + O2 (g) <-> 2 SO3 (g) has a delta H value of -197 kJ/mol. Use Le Chatelier's principle to explain what conditions would give the highest equilibrium yield and why industry uses different conditions. (5 marks)

Le Chatelier's principle states that if a system is disturbed - something changes - the system will tend to move in the direction that minimises the change. 3 marks from: The forward reaction is exothermic (...
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Answered by Conor C. • Chemistry tutor
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