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CHM111-practiceexam1

# CHM111-practiceexam1 - Practice Exam#1 Name Read...

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Practice Exam #1 Name ___________________ Read instructions carefully and follow them. Show calculations to receive maximum credit. Significant figures should be correct. Formulas and constants: c = v λ E = hv = h c λ E = 2 k 2 e 4 π 2 m n 2 h 2 r = n 2 h 2 4 ke 2 π 2 m λ = h m v Δ ( m v ) ⋅ Δ x h 4 π h = 6.63 x 10 -34 J s c = 3.00 x 10 8 m s -1 k = 8.99 x 10 9 J m C -2 m e = 9.11 x 10 -31 kg e = 1.60 x 10 -19 Avogadro’s number = 6.02 x 10 23 atoms mol -1

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1) Answer the following questions regarding these atoms: a) Complete the table: Element # protons # neutrons # electrons Electron configuration 69 Ga 71 Ga +3 10 B b) Which is larger, Ga +3 or Ga? State the trend that this exemplifies and explain it. c) Which element requires less energy to form a positive ion, Ga or B? State the trend that this exemplifies and explain it.
2) In different solar systems, the relative abundances of the elements can be different than those on Earth, affecting the atomic weight of an element.

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