chem revision ws
hey ppl!rem that ws ms ho gave us?some hol revision thing.the one w the cow.haha.here are the ans,courtesy of ms ho=)
Disclaimer: may not be 100% correct because I did them on the spot as I can’t find my original answers.
3. b. [Cu2+] = 8.02 x 10-6 mol dm-3
c. level of Cu after 20 yrs = 676.7ppm hence not safe
6. 3d electrons shouldn’t be paired when there’s an empty orbital available. And only electrons of opposite spin should be paired. lose 4s first ie. 4s orbital should be empty.
10. HF, N2, CO, NaF, MgO
15. amount of O2 needed = 73.4 mol
vol of air needed = 8.42 dm3
a more highly branched isomer will have higher vap. pressure
Disclaimer: may not be 100% correct because I did them on the spot as I can’t find my original answers.
3. b. [Cu2+] = 8.02 x 10-6 mol dm-3
c. level of Cu after 20 yrs = 676.7ppm hence not safe
6. 3d electrons shouldn’t be paired when there’s an empty orbital available. And only electrons of opposite spin should be paired. lose 4s first ie. 4s orbital should be empty.
10. HF, N2, CO, NaF, MgO
15. amount of O2 needed = 73.4 mol
vol of air needed = 8.42 dm3
a more highly branched isomer will have higher vap. pressure
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