6.2: group 7

Question 1

what is chlorine

Answer 1

a yellow-green gas

Question 2

what is bromine

Answer 2

red-brown liquid

Question 3

iodine

Answer 3

purple solid

Question 4

what is the trend in state for group 7

Answer 4

trend​ ​in​ ​state​ ​from​ ​gas​ ​to​ ​liquid​ ​to​ ​solid​ ​down​ ​the​ ​group

Question 5

what is the chemical test for chlorine

Answer 5

When​ ​damp​ ​litmus​ ​paper​ ​is​ ​put​ ​into​ ​chlorine​ ​gas​ ​the​ ​litmus​ ​paper​ ​is​ ​bleached
and​ ​turns​ ​white

Question 6

what is a displacement reaction

Answer 6

A​ ​more​ ​reactive​ ​halogen​ ​can​ ​displace​ ​a​ ​less​ ​reactive​ ​in​ ​an​ ​aqueous​ ​solution​ ​of​ ​its salt.

Question 7

why does group 7 decrease in reactivity going down the group

Answer 7

outer​ ​shell​ ​becomes​ ​further​ ​from​ ​the​ ​nucleus so electron​ ​shielding​ ​increases and attraction​ ​decreases​ ​between​ ​nucleus​ ​and​ ​outer​ ​electrons so electrons​ ​are​ ​gained​ ​less​ ​easily and halogens​ ​become​ ​less​ ​reactive

Question 8

what is oxidation

Answer 8

the loss of electrons

Question 9

what is reduction

Answer 9

gain of electrons