Aqa A-Level Chemistry (New Spec) 2.3 Group 7 - The Halogens Quizzes With Verified Answers.

AQA A-LEVEL CHEMISTRY (NEW SPEC) 2.3
GROUP 7 - THE HALOGENS QUIZZES WITH
VERIFIED ANSWERS.
What,are,the,5,halogens?,,,ANS,-Fluorine,,Chlorine,,Bromine,,Iodine,&,Astatine



Why,isn't,astatine,studied?,,,ANS,-
Because,it's,very,radioactive,and,can't,exist,for,more,than,a,few,seconds,before,decaying.



What,oxidation,state,are,the,G7,elements,usually,found,in?,,,ANS,--1,,found,as,X-
1,ions,(known,as,halide,ions)



Appearance,of,G7,elements:,Fluorine,,,ANS,-Very,pale,yellow,gas,,highly,reactive



Appearance,of,G7,elements:,Chlorine,,,ANS,-Pale,green,gas,,poisonous,in,high,concentrations



Appearance,of,G7,elements:,Bromine,,,ANS,-Red,liquid,,gives,off,dense,brown,or,orange,poisonous,fumes



Appearance,of,G7,elements:,Iodine,,,ANS,-Shiny,grey,solid,that,sublimes,to,a,purple,gas



Appearance,of,G7,elements:,Astatine,,,ANS,-Black,solid,,is,radioactive



Trends,of,G7:,Boiling,point,as,you,go,down,the,group,,,ANS,-Increases

-Number,of,VDW,forces,increase,between,molecules,as,they're,larger

-More,energy,is,needed,to,break,the,bonds



Trends,of,G7:,Electronegativity,,,ANS,-Decreases

-Atomic,radius,increases

-Shielding,increases

, -Less,attraction,between,the,outer,electrons,and,the,protons,in,the,nucleus



Are,the,halogens,oxidising,or,reducing,agents?,,,ANS,-Oxidising

-They,can,accept,electrons,and,are,reduced

F2(g),+,2e-,-->,2F-(aq)

Cl2(g),+,2e-,-->,2Cl-(aq)

Br2(l),+,2e-,-->,2Br-(aq)

I2(aq),+,2e-,-->,2I-(aq)



Trends,of,G7:,Oxidising,power,,,ANS,-Decrease

-Atoms,become,larger

-Shielding,increases

-Outer,e-'s,are,less,attracted,to,the,nucleus



Are,halides,oxidising,or,reducing,agents?,,,ANS,-Reducing

-They,can,lose,electrons,and,can,get,oxidised

2F-(aq),-->,F2(g),+,2e-

2Cl-(aq),-->,Cl2(g),+,2e-

2Br-(aq),-->,Br2(l),+,2e-

2I-(aq),-->,I2(aq),+,2e-



Trends,of,G7:,Reducing,power,,,ANS,-Increase

-Atoms,larger

-Shielding,increases

-Electrons,aren't,attracted,to,the,nucleus,as,strongly,so,they're,more,easily,lost



Trends,of,G7:,Displacement,reactions,,,ANS,-
The,more,reactive,halogens,(strongest,oxidising,agents),will,displace,the,more,reactive,halides,(strongest,
reducing,agents),from,solutions,of,their,ions