1. Chapter 1 HW Solutions

2. Ch 1.1 – 1.3  #2  A) solid  B) gas  C) liquid  D) gas

3. #4  A) homogeneous mixture  B) heterogeneous mixture  C) pure substance  D) mixture (hetero vs. homo can’t be determined by visual inspection)

4. #8  A) Be B) Cs C) F  D) Mn E) As F) Xe G) P  H) Sc

5. #10  A) Barium  B) Californium  C) Molybdenum  D) SeleniumE) Thallium  F) VanadiumG) Gold  H) Zirconium

6. #11  A is a compound – rationale CO 2 produced  B is probably compound because it is a white solid

7. Ch1.4 – 1.6  #18a

8. 18b

9. 18 c, d, e

10. 18 f, g

11. #20

12. #24  Vol = length 3 ; density = mass/vol

13. #27  Thickness=volume/area

14. CH 1.7 – 1.9

15. #34  A) 4  B) 3  C) ambiguous 5,6, or 7  D) 6  E) 6

16. #36  A) 1.44 X 10 5  B) 9.75 X 10 2  C) 8.90 X 10 5  D) 6.76 X 10 4  E) 3.40 X 10 4  F) –6.56

17. #38  A) -2.3 X 10 3  B) 8.260 X 10 7  C) 3.4 X 10 4  D) 7.62 X 10 5

18. #41

19. #43 a-d

20. #43 e & f

21. #45

22. Chapter 2 HW Solutions

23. 2.1 – 2.3  #2 A) 6.500 g compound -.384 g H = 6.116g S B) Conservation of Mass C) Atoms are not created or destroyed so if a compound has only H and S and.384 grams is H the rest must be sulfur

24. #4 integer ratio indicates combining F units that are indivisible

25. #5  Evidence that cathode rays were negatively charged was the electric and magnetic field deflected the ray the same way it would a negative charge and that the negative plate exposed to the cathode rays acquired a negative charge.

26. #11

27. #14  A) 32 P has 15 p, 17n, 15 e  B) 51 Cr has 24p, 27n  C) 60 Co has 27 p, 33 n

28. Ch 2.4 – 2.5  #20  A) Lithium (metal) B) scandium (metal)  C) germanium (Metalloid) D) ytterbium (metal)  E) manganese (metal) F) gold (metal)  G) tellurium (metalloid)

29. #21  A) K, alkali metals (metal)  B) I, halogens (nonmetal)  C) Mg, alkaline earth metals (metal)  D) Ar, noble gases (nonmetal)  E) S, chalcogens (nonmetals)

30. #23  An empirical formula shows the simplest ratio of the different atoms in a molecule.  A molecular formula shows the exact number and kinds of atoms in a molecule.  A structural formulas shows how these atoms are arranged.

31. #26  A) 4  B) 6  C) 9

32. #28  See board  A) Draw C 2 H 5 Br (1-bromo-ethane)  B) Draw C 2 H 7 N ( dimethylamine)  C) Draw CH 2 Cl 2 ( dichloromethane)  D) Draw NH 2 Cl (chloroamine)

33. #30  A) SN  B) C 7 H 15  C) C 3 H 5 O  D) P 2 O 3  E) C 3 H 5 F 4  F)SiO 3

34. #32  A) Ba 2+  B) La 2 + or La 3+  C) Ga 3+  D) S 2-  E) Br -

35. #61 Symbol 52 Cr 3+130 I -107 Ag +119 Sn 2+75 As 3- Protons 2453475033 Neutron 2877606942 Electron 2154464836 Net charge 3+1-1+2+3-

36. Chapter 2.6 – 2.7 #38  Molecular (all atoms are nonmetals) c) SCl 2  Ionic (formed by a cation and an anion, usually contains a metal cation)— a) Sc 2 O 3 b) NaI d) Ca(NO 3 ) 2 e) FeCl 3 f) LaP g) CoCO 3 h) (NH 4 ) 2 SO 4

37. #39  A) ClO 2 - B) Cl-C) ClO 3 -  D) ClO 4 - E) ClO -

38. #42  A) silver sulfide  B) barium phosphate  C) magnesium chlorate  D) strontium sulfite  E) cobalt (II) bromide (cobaltous bromide)  F) tin (II) iodide (stannous iodide)  G) chromium (III) nitrate (chromic nitrate)

39. #42 continued  H) zinc hydrogen phosphate (notice the lack of roman numerals—it has a definite charge of +2)  I) silver perchlorate (notice the lack of roman numerals—it has a definite charge of +1)  J) ammonium dichromate

40. #44  A) Mg 3 N 2  B) FeSO 3  C) Cr 2 (CO 3 ) 3  D) CaH 2  E) Mg(HCO 3 ) 2  F) KClO  G) Cu(C 2 H 3 O 2 ) 2

41. #46  A) HBr  B) H 2 SO 3  C) HNO 2  D) carbonic acid  E) chloric acid  F) acetic acid

42. #48  A) dinitrogen monoxide  B) nitrogen monoxide  C) nitrogen dioxide  D) dinitrogen pentoxide  E) dinitrogen tetroxide

43. #58  A) alkali metal – K  B) an alkaline earth metal – Ca  C) a noble gas – Ar  D) a halogen – Br  E) a metalliod – Ge  F) a nonmetal in 1A – H  G) a metal that forms a 3+ charge- Al  H) a nonmetal that forms a 2- charge – O  I) a metal that resembles Al - Ga

44. #62  A) Nickel (II) oxide, 2+  B) Manganese (IV) oxide, 4+  C) Chromium (III) oxide, 3+  D) Molybdenium (VI) oxide, 6+

45. #63  Fe 3 S 4 could be aq homo mixture where the Fe 2+ and the Fe 3+ ions are portions of the lattice structure

46. #64  A) IO 3 -  B) IO 4 -  C) IO -  D) HIO  E) HIO4 (or H 5 IO 6 )

47. #67  A) potassium nitrate  B) sodium carbonate  C) calcium oxide  D) hydrochloric acid  E) magnesium sulfate  F) magnesium hydroxide