Updated Oct.15/04	

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NUMERICAL ANSWERS TO ASSIGNED TUTORIAL PROBLEM SETS FOR CHEM205
FROM KOTZ & TREICHEL'S CHEMISTRY & CHEMICAL REACTIVITY			
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NOTE:  none of the answers from Ch.2 have been verified 
NOTE:  "^" means "raised to the power of..." to indicate scientific notation...


Ch.	Q#	Answer		Units		SFs	Comments
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2	1						in nucleus: protons (+1), neutrons (0)
2	1						electrons (-1), least massive
2	5						Thomson:  mass-to-charge ratio of e-; Millikan: charge on e-; together --> mass of e-
2	5						Rutherford: disproved Thomson's model; proved +, massive nucleus at centre with e-s surrounding it
2	7						Radon, Rn
2	15						see world wide web…e.g., www.webelements.com
2	23a						(superscript 19)(subscript 9)F
2	23b						(superscript 52)(subscript 24)Cr
2	23c						(superscript 132)(subscript 54)Xe
2	25a						6e-, 6p+, 7n
2	25b						29e-, 29p+, 34n
2	25c						83e-, 83p+, 122n
2	29						isotopes of X:  (superscript 19)(subscript 9)X, (superscript 20)(subscript 9)X, (superscript 21)(subscript 9)X
2	33	24.31		amu		4	
2	35	57.20		%		4	antimony-121
2	35	42.80		%		4	antimony-123
2	37a	835		g		3	Au
2	37b	62.4		g		3	He
2	37c	12		g		2	Pt
2	37d	0.0888		g		3	Pu
2	39a	0.696		mol		3	Na
2	39b	7.38x10^-3	mol		3	Sn
2	39c	1.7x10^-5	mol		2	Pt
2	39d	7.49x10^-3	mol		3	Xe
2	43	18		elements			metals: K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga,
2	43						metalloids: Ge, As
2	43						nonmetals: Se, Br, Kr
2	47						copper  65Cu: 29p+, 36n, 29e-
2	47						krypton  86Kr:  36p+, 50n, 36e-
2	47						platinum  195Pt:  78p+, 117n, 78e-
2	47						bromine  81Br:  35p+, 46n, 35e-
2	49						top:  S  N    bottom:  B  I
2	53						Ba more reactive than Ca (more vigorous H2 evolution; perhaps flame)
2	53						Mg period 3; Ca period 4; Ba period 6
2	53						reactivity increases going down a group
2	57						Zn zinc, Cd cadmium or Hg mercury
2	57						18 possible answers…
2	57						Pb, lead
2	57						Se, selenium
2	57						Na, sodium
2	57						Xe, xenon
2	57						Se, selenium
2	57						Ge, germanium OR As, arsenic
2	59	1.6x10^20	Fe atoms		2	iron…
2	61	14.9		cm		3	edge length
2	65	2.3x10^14	g/cm3		2	density of nucleus -- HUGE!
2	65	3.34x10-3	g/cm3		3	density of electron cloud -- very low!
2	65						nucleus is much more dense…
2	66	1.0028x10^23	C atoms 	5	max mass of C on balance = 20001g, so used this mass…