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An unknown compound burns with a lilac flame and produces a yellow precipitate when mixed with dilute nitric acid and silver nitrate. Give the formula of the compound.

(Talk about needing to memorise colour tests for base metals and tests for Halides) The compound is KI (potassium Iodide) because potassium compounds burn with a lilac flame, and production a pale yellow pre...
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Answered by Matthew H. • Chemistry tutor
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Write down the equation which links speed, distance and time

speed = distance/time
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Answered by Sean M. • Physics tutor
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Solve the following equation: 6x – 9 > 4x + 3

2x - 9 > 3, 2x > 12, x > 6
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Answered by Sean M. • Maths tutor
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‘Lenin’s role in bringing about the collapse of the Provisional Government on October/ November 1917 was pivotal.’ Explain why you agree/disagree with this view

Lenin was the Bolshevik Party leader who believed in a proletariat revolution, with the Provisional Government (PG) being a development of the Progressive Bloc now replacing the tsarist regime after the abdi...
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Answered by Astrid B. • History tutor
14668 Views

How to solve how many sweets Hanna had?

This was a GCSE question in 2015. There are n sweets in a bag. 6 of them are orange, the rest are yellow. Hanna takes a random sweet from the bag and eats it. She then takes another random sweet and eats tha...
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Answered by Callum M. • Maths tutor
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