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Suppose the amount of a certain radioactive substance in a sample decays from 7.50mg to 1.00mg over a period of 60.0 years. Calculate the half life of the substance. Round your answer to 2  significant digits.

Suppose the amount of a certain radioactive substance in a sample decays from 7.50mg to 1.00mg over a period of 60.0 years. Calculate the half life of the substance. Round your answer to 2  significant digits.

Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter21: Nuclear Chemistry
Section: Chapter Questions
Problem 21.39QE
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Question

Suppose the amount of a certain radioactive substance in a sample decays from

7.50mg

to

1.00mg

over a period of

60.0

years. Calculate the half life of the substance.

Round your answer to

2

 significant digits.

 

 

For each chemical reaction listed in the table below, decide whether the highlighted atom is being oxidized or reduced.
reaction highlighted atom is being...
oxidized reduced neither oxidized nor reduced
CO
(g)
+
H2O
(g) →
CO2
(g)
+
H2
(g)
 
 
 
 
 
 
2H2S
(aq)
+
O2
(g) →
2S
(s)
+
2H2O
(l)
 
 
 
 
 
 
CuSO4
(aq)
+
Zn
(s) →
ZnSO4
(aq)
+
Cu
(s)
 
 
 
 
 
 
Na2CO3
(s)
+
H3PO4
(aq) →
Na2HPO4
(aq)
+
CO2
(g)
+
H2O
(l)
 
 
 
 
 
 
 
 
 

 

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