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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 48 times)

viki

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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


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parker125

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viki

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Reply 2 on: Aug 27, 2018
Excellent


epscape

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Reply 3 on: Yesterday
:D TYSM

 

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