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Author Question: Cesium-137 undergoes beta decay and has a half-life of 30.0 years. How many beta particles are ... (Read 52 times)

viki

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on: Aug 27, 2018
Cesium-137 undergoes beta decay and has a half-life of 30.0 years. How many beta particles are emitted by a 14.0-g sample of cesium-137 in three minutes?
 
  A) 6.1  1013
  B) 6.2  1022
  C) 8.4  1015
  D) 1.3  10-8
  E) 8.1  1015

Question 2

Calcium hydride (CaH2 ) reacts with water to form hydrogen gas: CaH2 (s) + 2H2O (l)  Ca(OH)2 (aq) + 2H2 (g) How many grams of CaH2 are needed to generate 48.0 L of H2 gas at a pressure of 0.995 atm and a temperature of 32 C?
 
  A) 56.8
  B) 0.954
  C) 161
  D) 40.1
  E) 80.3

Question 3

Complexes containing metals with d10 electron configurations are typically colorless because ________.
 
  A) there is no d electron that can be promoted via the absorption of visible light
  B) the empty d orbitals absorb all of the visible wavelengths
  C) there are no d electrons to form bonds to ligands
  D) a complex must be charged to be colored
  E) d electrons must be emitted by the complex in order for it to appear colored
Chemistry: The Central Science ¦ Brown, LeMay, Bursten ¦ 14th Edition
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parker125

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Reply #1 on: Aug 27, 2018
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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viki

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Reply 2 on: Aug 27, 2018
Gracias!

juliaf

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Reply 3 on: Yesterday
Excellent

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