CHE 113 Review & Preparatory Assignment Answers

1c

2b, recall B only want 6 pairs, carbonate has 24 valence electrons

3c

4a

5a

6c

7a

8. London dispersion force – it is a nonpolar molecule

9. Dipole force – it is a polar molecule

10. Dipole force - it is a polar molecule

11. London dispersion force – it is a nonpolar molecule due to its symmetry (trigonal planar)

12. London dispersion force – it is a nonpolar molecule due to its symmetry (linear)

13. hydrogen bond (note this is not a true bond, it is a very special case of a dipole force)

14. HF due to hydrogen bonding

15. NO, dipole force > dispersion force for comparably sized molecules

16. H₂Se, dispersion forces increase as size increases

17. 2.356

18. 2.354

19. 0.0006570

20. 213.2

21. 3.218 x 10³

22. 1.234 x 10⁷

23. 4

24. 4

25. 8

26. 3

27. ambiguous, could be 2,3, or 4

28. 6

29. 5

30 – 41, Recall there is one rule for addition & subtraction, & a different rule for multiplication & division.

30. 0.89

31. 117          

32.1.5 x 10³

33. 4.30

34. 1.97 x 10^-3

35. 123

36. 87.6

37. –91

38. 108.8

39. 51

40. 8.4

41. 2.05

42. 0.0874 mole

43. 0.308 mole

44. 2.9 x 10² g

45. 15 g

46. 31.4 g CO₂

47. O₂ is limiting; 9.17 g CO₂

48. 88.4%