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State why it is initially unexpected for alkenes to undergo electrophilic addition with bromine. Explain why this reaction does indeed occur.

Bromine exists as Br 2 , and since both bromine atoms are identical - their electronegativities identical, - the electron density is distributed evenly across the molecule (it is non-polar, the atoms have eq...
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Answered by Kai C. • Chemistry tutor
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To what extent was the Great Terror a result of ecconomic difficulties within the Soviet Union?

The Great Terror certainly held origins within the economic difficulties and outcomes of Joseph Stalin's policies of collectivisation and industrialisation, which fundamentally re-structured all elements of ...
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Answered by Aaron M. • History tutor
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What historical factors contributed to the demise of the Roman Republic?

The Roman Republic ended sometime between 49 BC and 27 BC; the first date being when Caesar crossed the Rubicon, which started the terminal civil wars of the Republic, and the second being Augustus’ formal “...
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Explain a bubble sort. You may use pseudocode and/or diagrams to help demonstrate your answer.

A bubble sort works by performing a number of passes on a list of data. With each pass the list will get closer to the final order. During a pass the algorithm compares a selected item with each item in the ...
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Explain the trend in first ionization energy down group 2. (3 marks)

The trend in first ionisation energy down a group: DECREASES due to:- Increase in atomic radius as there are more shells- Increased shielding because there is more electron repulsion from inner shells- This ...
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