contact, nitrate

Question 1

contact proc stage 1

Answer 1

3 stage: solid Sulphur melted, then burnt-> SO2

Question 2

contact stage 2

Answer 2

from SO2:

SO3 made from reversible rxn w O2 (vanadium oxide cat)

Question 3

contact stage 3

Answer 3

from SO3:
add sulphuric acid->H2S2O7 (oleum)
+wr-> sulphuric acid (v exotherm

Question 4

df where = molecular formula, dif stt formula

Answer 4

structural isomer

Question 5

ds sulphur (5

Answer 5

in nature ‘octosulphur’ -8S in ring
burns w blue flame
melts into deep red lqd
smelly compounds eg in gas so c smell if leak
creates cross links in rubber when volcanised w it
//ring. burns red a blue. smoke smells. smoke forms into poles (repr cross links

Question 6

df serial dilutions

Answer 6

mk v dilute

Question 7

formula conc b4, after dilution (https://www.youtube.com/watch?v=9xILNX37H_0&list=PLW0gavSzhMlReKGMVfUt6YuNQsO0bqSMV&index=65

Answer 7

m1v1= m2v2, m=conc, v=volume

Question 8

df any proc where N becomes nitrate ion

Answer 8

fixing

Question 9

nm 4 ways fixing

Answer 9

bacteria in soil, ocean algae
decomposers
lightning:
pollution: relase nitrous oxide, change to nitric acid

Question 10

ds fixing by decomposers

Answer 10

N in excretion, dead things to soil as NH3

then to NO2 then bacteria turn it to nitrate

Question 11

ds fixing by lightning

Answer 11

cause N->NO2 (nitrous acid),
then NO2+ O-> nitric acid,
dissolve a fall in rain
rain increase conc nitrate in soil

Question 12

electronegativtiy H,C

Answer 12

2.2, 2.55