90780 Describe properties ofparticles and thermochemical        principles 2010  Questions 3 and 4 thermochemistry
90780 Describe properties of       particles and thermochemical             principles Q3 2010QUESTION THREE(a) (i) Write ...
90780 Describe properties of particles and       thermochemical principles Q3 2010(b) The equation for the combustion of e...
90780 Describe properties of particles and thermochemical principles Q4                2010(a) (i) Write the equation for ...
90780 Describe properties of particles and thermochemical principles Q4                2010(b) Ethanol (CH3CH2OH) and prop...
90780 Describe properties of particles   and thermochemical principles Q4                  2010  © Account for the differe...
Upcoming SlideShare
Loading in …5
×

90780 2010 particles and thermochemistry

1,675 views

Published on

thermochemistry questions from 90780 2010

Published in: Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,675
On SlideShare
0
From Embeds
0
Number of Embeds
285
Actions
Shares
0
Downloads
3
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

90780 2010 particles and thermochemistry

  1. 1. 90780 Describe properties ofparticles and thermochemical principles 2010 Questions 3 and 4 thermochemistry
  2. 2. 90780 Describe properties of particles and thermochemical principles Q3 2010QUESTION THREE(a) (i) Write the equation for which the enthalpy change is the enthalpy of formation, Δf H°, for zinc oxide.(a) (ii) Zinc oxide is formed when zinc sulfide is heated in air.2ZnS(s) + 3O2(g) → 2ZnO(s) + 2SO2(g)Calculate the enthalpy change, ΔrH°, for this reaction, usingthe following data.Δf H° (ZnS(s)) = –200 kJ mol–1Δf H° (ZnO(s)) = –348 kJ mol–1Δf H° (SO2(g)) = –297 kJ mol–1
  3. 3. 90780 Describe properties of particles and thermochemical principles Q3 2010(b) The equation for the combustion of ethanolis:CH3CH2OH(g) + 3O2(g) → 2CO2(g) + 3H2O(g) ΔrH° = –1379 kJ mol–1Calculate the bond enthalpy for the O–H bondusing the enthalpy of the reaction above and thebond enthalpy data in the table. Bond Bond enthalpy / kJ mol–1 C-H +412 C-O +360 O=O +496 C-C +348 C=O +743
  4. 4. 90780 Describe properties of particles and thermochemical principles Q4 2010(a) (i) Write the equation for which the enthalpy change is the enthalpy of fusion, ΔfusH°, for zinc sulfide.(ii) Give a reason why ΔfusH° is always greaterthan zero.
  5. 5. 90780 Describe properties of particles and thermochemical principles Q4 2010(b) Ethanol (CH3CH2OH) and propane(CH3CH2CH3) have similar molar masses butethanol is a liquid at room temperature, whilepropane is a gas.Identify the types of intermolecular forces foreach of these substances and explain whyethanol has a higher boiling point than propane.
  6. 6. 90780 Describe properties of particles and thermochemical principles Q4 2010 © Account for the difference in the boiling points of the two substances in the table below by comparing all the intermolecular forces.Name Structure Boiling Point / °Cbutan-1-ol CH3CH2CH2CH2OH 117.72-methylpropan-2-ol 82.6

×