Radioactive elements decay via first-order kinetics. Consider a certain type of nucleus that has a rate constant of 2.4 × 10-2 h-1. A sample contains 6.5 × 108 radioactive nuclides. Calculate the time required for 59% of the nuclides to decompose. ?12=0.693?t12=0.693k ln[?]?=−??+ln[?]?ln⁡[A]t=−kt+ln⁡[A]o Group of answer choices A. 2.2 × 10-1 h B. 1.6× 101 h C. 2.2 × 101 h D. 1.0 × 101 h E. 3.7 × 101 h

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Chapter1: Chemical Foundations
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Radioactive elements decay via first-order kinetics. Consider a certain type of nucleus that has a rate constant of 2.4 × 10-2 h-1. A sample contains 6.5 × 108 radioactive nuclides. Calculate the time required for 59% of the nuclides to decompose.

?12=0.693?t12=0.693k

ln[?]?=−??+ln[?]?ln⁡[A]t=−kt+ln⁡[A]o

Group of answer choices
A. 2.2 × 10-1 h
B. 1.6× 101 h
C. 2.2 × 101 h
D. 1.0 × 101 h
E. 3.7 × 101 h
 
2.
Which metal is the best reducing agent?
Group of answer choices
A. ??+(??)+1?Ag+(aq)+1e- ⟶??(?);?∘=0.80?⟶Ag(s);E∘=0.80V
B. ??3+(??)+3?Au3+(aq)+3e ⟶??(?);?∘=1.50?⟶Au(s);E∘=1.50V
C. ??2(?)+2?Cl2(g)+2e- ⟶2??⟶2Cl-; ?∘=1.36?E∘=1.36V
D. ?2(?)+2?F2(g)+2e- ⟶2?⟶2F-1; ?∘=2.87?E∘=2.87V
E. ??4+(??)+4?Sn4+(aq)+4e- ⟶??(?);?∘=0.15?
 
3.

In an acidic solution, balance the following redox reaction with lowest possible coefficients. What is the coefficient in front of Fe2+?

??2+(??)+???−4(??)⟶??3+(??)+??2+(??)Fe2+(aq)+MnO4−(aq)⟶Fe3+(aq)+Mn2+(aq)

 

Group of answer choices
A. 3
B. 4
C. 8
D. 1
E. 5
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