AQA 2.3 Group 7, the halogens REVISION

Complete revision for AQA A Level Chemistry. To buy the PowerPoint used in this video please visit my tes shop - www.tes.com/te...

[@naven2802]

I’ve been failing the AS course all year. Haven’t understood a thing outside of organic chemistry. Then I discovered your playlist, and safe to say in a few hours of youtube, I’ve learned more than I did in five months of college. With my AS mock tomorrow, if my grade finally scrapes above a U, it’s all thanks to you!

[@AlleryChemistry]

Thanks very much! Best of luck in your exam!

[@medicusv61]

How did it go mate?

[@thinkdontshoot8065]

what happened did you get any results back???

[@dno.16]

howd it go???

[@lilyofthevalley005]

how was it x

[@racheldoran9758]

Timestamps: TRENDS IN PROPERTIES (2.3.1) 1:04 = Trends in BP and electronegativity 3:18 = Displacement reactions (trend in oxidising ability of the halogens) 13:02 = Trend in reducing ability of halide ions 14:28 = Reactions of halides with conc. H2SO4 20:50 = Reactions of halides with silver nitrate (test for halides) ***** USES OF CHLORINE & CHLORATE(I) 6:40 = Bleach (NaClO) 8:24 = Water Sterilisation (Reactions of Chlorine with water) 10:58 = Advantages and Disadvantages of chlorinating water ***** REQUIRED PRACTICAL 4: Ion Tests 23:51 = Group 2 24:42 = Ammonium 25:15 = Hydroxides 25:45 = Carbonates 26:07 = Sulfates 26:55 = Order of tests (avoiding false positives)

[@godgod6335]

Legend

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[@seinebabbas3586]

Halogens: 1:09 Displacement reactions: 3:22 Bleach: 6:46 Water sterilisation: 8:27 Drinking water: 10:59 Reducing power of halide ions: 13:04 Halide ions + sulphuric acid: 14:32 Halide ions + silver nitrate: 20:50 Test for ions: 24:00

[@sadies2430]

I've struggled so much in inorganic but this video was so engaging and understandable while covering all the material. You're a godsend

[@jailbreaker4041]

28 min video Me: takes 3 hours to make notes on it...

[@unviewsyourmonster8113]

28 min video Me: x2 speed morning of test

[@favourebohon5259]

You made this ages ago but I want to say thank you so so much. I've always hated the reducing power equations but your examples and the train analogy were excellent. I now know them from memory!

[@AlleryChemistry]

Thanks. Yes, the syllabus hasn't changed in a long time so all still relevant 👍

[@KyuuleGamingHD]

You can alternatively form Na2S04 from sulfuric acid and sodium chloride/bromide/iodide as an extra note.

[@ximfo4883]

You legend, before i watched this I was struggling but this helped a lot!

[@humayrahpatel2855]

These literally saved me for my mocks

[@Jregi7201]

i really like your videos. they'are straight forward and thanks to you i understand the topic. My end of year exam will be on five days and my chemistry teacher didn't even teach us this.

[@aishafarah8505]

I finally understand this topic.Thank you so muchhh

[@gamehacker830]

Thank you I don’t even normally comment like ever but I WATCHED EVERY OTHER HALOGEN VIDEO AND COULD NOT UNDERSTAND AT ALL. Like IDK WHAT WAS WITH THIS TOPIC But when I watched yours honestly I understand it now like I can do questions to it so I’m happy I have a base so thank you 💙

[@AlleryChemistry]

Thanks very much! Very kind of you.

[@olorireAinenehi]

Chemistry P1 tomorrow and this channel has been absolutely amazing thank you :)

[@AlleryChemistry]

Hope it went well 👍

[@hellohellohello257]

Have my chem mock on Monday and this vid was super useful in filling in any gaps I needed to fill. Now the A* seems more achievable so thank you so so much!

[@AlleryChemistry]

Hope it goes well, show them what you know 👍

[@kundai5265]

Loving this revision series! perfect for a quick overview on the to and from school 😅

[@AlleryChemistry]

Absolutely! Keep up the hard work, it will pay off in the end.

[@jimliu7086]

Thanks for this video! One thing, surely the equation for the reaction of chlorine with water under sunlight would be. H2o+Cl2->2H+ + 2Cl- + 1/2O2, or doubled.

[@bobsmith-xu9xg]

no then it wouldn’t be a disproportionation reaction

[@bellamarina6362]

Thank you so much for these videos they're a life saver 👍🏻👍🏻

[@AlleryChemistry]

You're welcome! Please share the vide. The more people they help the better!

[@iq-_-]

Hi sir, is it ok if I write the first equation at 10:04 as H2O (l) + Cl2(g) HClO (aq) + HCl (aq) Should the reaction have a reversible reaction arrow?

[@kirenrashid1516]

Hi, quick question, do you think these revision videos go into enough detail or should I watch the subtopic videos for more depth of knowledge

[@lemon3387]

does anyone know why at 3:21 Cl is colourless, Br is orange and I is red/brown when that isn't their colours shown before

[@hamsejama5068]

I' m very happy to listen this good lessons

[@KianOCallaghan-mq2bc]

@AlleryChemistry At 27:48, wont the chlorine ions from the HCL used to test for carbonates always give a white precipitate positive result when further testing the sample for halides? If you were testing for Iodine or Bromine wont this affect the results? Or would they form Cl2 prior to halide test?

[@jjgeorge8719]

Hence the ammonia

[@DDD-we1em]

Thank you sir, it is really clear to understand!

[@khadija2625]

This man invented live lessons before we needed them

[@maryammm859]

for one of the disadvantages of adding chlorine to water - where cl2 can react with organic compounds present in the water to make chloroalkanes, you said it's a belief by some scientists, so does aqa require you to know this?

[@shmlobblob7490]

With disproportionation reactions, how can you tell that the chlorine is both oxidised and reduced, just by looking at the oxidation states? does +1=oxidised and -1=reduced or?

[@harrietwardrop2703]

Chlorine as an element is a reactant in this equation and elements have an oxidation state of 0. In NaCl, the chloride ion has an oxidation state of -1 and the decrease in oxidation state from 0 shows that the chlorine has been reduced. In ClO-, the chlorine has an oxidation state of +1 and the increase in oxidation state from 0 shows that it has been oxidised. Therefore, the same species has been both oxidised and reduced in the same reaction making it disproportionation :) hope this helps

[@rishiballis7513]

yes by looking at the oxidation states you know it's been either reduced or oxidised

[@ayesha1929]

If the number decreases its been reduced. If the number increases its been oxidised.

[@mrspedrix1858]

For displacement reactions with halogen and halide how is it less oxidising down the group as you are more likely to lose an electron

[@Anna-pt4uf]

Thank you, thank you, thank you !!

[@TM-xi8co]

at the end of the video when you mentioned the order of testing to prevent false positives. where would the tests for group 2 Cations, ammonium compounds and hydroxides?

[@georgeashby4852]

Brilliant

[@sinemsayan6650]

This vid is gonna blow up with the release of the new topic list!!

[@Ibrahimwaleedh]

it could have been best if you have included 'shielding effect of electrons' when explaining boiling point and reactivity

[@_GShock_]

one thing i am confused about, a video before you said that the oxidation state a chlorine ion would be +3 if it is bonded with oxygen but why when it's as a chlorate ion is its' oxidation state only +1 and not +3?

[@genericcommenter1267]

chlorine won't necessarily be +3 when bonded with oxygen. When Cl is bonded to a more electronegative element like O or F then it will have a positive oxidation state as opposed to its usual -1.

[@legendlegend4459]

do we have to know the color for each gas for aqa

[@medicusv61]

Yes.

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Can you make AQA year 2 revision please?

[@AlleryChemistry]

Vote on now. Vote via twitter twitter.com/allerytutors/status/1258408810714140672?s=20

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OCR A starting to be uploaded tonight.

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Love u man

[@iqraahmed4066]

i thought iodine was a purple solution

[@AlleryChemistry]

It's brown/orange colour. Iodine vapour is purple so you may be getting mixed up.

[@uchihaitachiofthesharingan]

and gray when solid, really confusing lol@@AlleryChemistry

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