Halogens AQA A-level Chemistry

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Last updated: December 13, 2020

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Question	Answer
why acidify a solution before adding silver nitrate	to remove impurities
Give the half equation of bromide (from the reaction with sulfuric acid)	2Br- > Br2 + 2e-
define oxidation	loss of electrons
what is the first test used for halide identification	silver nitrate test
which group are halogens	7
what is disproportionation	when an atom is both oxidised and reduced at the same time
what happens to reactivity as you go down the group	decreases
what is the colour of the precipitate formed when silver nitrate is added to bromide	pale cream
What is the equation between sodium chloride and sulfuric acid	Nacl + H2SO4 > HCl + NaHSO4
what is the colourless (choking) gas produced when Iodide reacts with sulfuric acid	Sulfur dioxide
does silver iodide dissolve in ammonia	no
what is the bad egg smell gas produced when iodide reacts with sulfuric acid	H2S
what is formed when silver chloride reacts with ammonia	colourless solution
what is the reversible equation for when solid sodium chlorate reacts with water	NaClO + H2O > Na+ + OH- + HClO
what is the colour of the precipitate formed when silver nitrate is added to chlodide	white
does silver bromide dissolve in ammoia	only in concentrated ammonia
what happens to boiling point as you go down the group	increases
what colour is the bromine gas produced from the reaction of bromine with sulfuric acid	brown
will chlorine displace bromide from a molecule	yes

Question	Answer
what is an oxidising agent	an atom which oxidises another atom
what colour is the iodine gas produced from the reaction of iodide with sulfuric acid	purple
what is reducing power	the ability of an atom to reduce another atom
what are the silver halides then reacted with	ammonia
what is the reaction of chlorine with sodium hydroxide	Cl2 + 2NaOH > NaClO + NaCl + H2O
what is the chlorine reaction that happens in sunlight	2Cl2 + 2H2O > 4HCl + O2
define reduction	gain of electrons
why does the amount of chlorine in pools need to be controlled	it is toxic
what is the oxidation states of hydrogen	+1
what is the colour of the precipitate formed when silver nitrate is added to iodide	pale yellow
what is the oxidation state of sulfur in H2SO4	6
what type of reaction forms steamy fumes when a halide reacts with sulfuric acid	acid-base
what is the oxidation state of oxygen	-2
why is chlorine put in swimming pools	to kill bacteria
what is the first electron affinity	the energy released when 1 mole of gaseous atoms each gain an electron, forming 1 mole of gaseous 1- ions
what is produced when fluoride ions react with sulfuric acid	steamy fumes
what happens to electronegativity as you go down the group	decreases
what is the reversible reaction from chloric acid to hydrochloric acid	Cl2 + H2O > HClO + HCl
what is the colour of the precipitate formed when silver nitrate is added to fluoride	no precipitate

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