Topic 4-inorganic chemistry

Question 1

Testing for barium carbonate with sulphuric acid

Answer 1

It will be seen as not valid as most carbonates produce gas but barium sulphate is an insoluble precipitate

Question 2

Reactivity of group 1 and 2

Answer 2

Outer ELECTRON further away
Increased shielding
First ionisation energy decrease so reactivity increase

Question 3

Thermal stability of group 1 and 2

Answer 3

Group 2 has more electrons (similar size due to same subshell)
Group 2 more likely to polarise

Question 4

HCL and carbonate

Answer 4

-effervesence
2H++Co32-_____>Co2+H2O

Question 5

Flame test

Answer 5

energy released as visible light
diff amount of energy released so colour is different

Question 6

Ammonium and hydroxide

Answer 6

NH4+ + OH-____>NH3+H2O

Question 7

Hydrated magnesium chloride heated

Answer 7

-Brown gas
-solid dissolves
-White solid forms

Question 8

Chlorine content

Answer 8

-low cl-HCLO lower so not effective
-high-HCL high so strongly acidic

Question 9

HCl

Answer 9

conduct electricity as covalent bond changes to ionic in aq solution

Question 10

Ammonia and HCl equation

Answer 10

HCl + NH3-> NH4Cl

Question 11

Obtaining solid from sample

Answer 11

-Cool
-filter off
-dry

Question 12

Potassium bromide added to iodine

Answer 12

No reaction as iodine is a weaker oxidising agent