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(solution) Nuclides above the valley of stability can become more stable


Nuclides above the valley of stability can become more stable through which of the following processes?

 

           

beta emission
positron emission
gamma emission
electron capture
neutron bombardment

Fluorine-18 undergoes positron emission with a half-life of 1.10 x 102 minutes.  If a patient is given a 248 mg dose for a PET scan, how long will it take for the amount of fluorine-18 to drop to 83 mg?  (Assume that none of the fluorine is excreted from the body.)

174 min
99 min
132 min
300. min
211 min

In which of the following does americium-241 have the longest half-life?

1.0 g of molten americium-241
it is the same in all of these
1.0 L of 1.00 M americium-241 chloride solution
1 kg of pure solid americium-241


Which of the following statements is TRUE?

All of these are true
An alpha particle is a helium 2+ ion.
A positron is the antiparticle of the electron.
Beta decay occurs when a neutron changes into a proton while emitting an electron.
Positrons are similar in ionizing power and penetrating power to beta particles.

Nickel can be plated from aqueous solution according to the following half reaction. How long would it take (in min) to plate 29.6 g of nickel at 4.7 A?

 

            Ni2+(aq) +  2 e? ? Ni(s)

350 min
620 min
480 min
170 min

A galvanic cell consists of a Ni2+/Ni half-cell and a standard hydrogen electrode. If the Ni2+/Ni half-cell standard cell functions as the anode, and the standard cell potential is 0.26 V, what is the standard reduction potential for the Ni2+/Ni half-cell?

-0.13 V
+0.26 V
+0.13 V
-0.26 V

What element is being reduced in the following redox reaction?

 

            MnO4?(aq) + H2C2O4(aq) ?  Mn2+(aq) + CO2(g)

O
Mn
H
C


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What element is the oxidizing agent in the following redox reaction?

 

            Cr(OH)4?(aq) + ClO?(aq) ? CrO42-(aq) + Cl?(aq)

Cr
H
Cl
O


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Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of Br2 and OH? in the balanced reaction?

 

            Br2(l) ?  BrO3?(aq) + Br?(aq)

Br2 = 3, OH? = 3
Br2 = 3, OH? = 6
Br2 = 1, OH? = 2
Br2 = 2, OH? = 5


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Determine the cell notation for the redox reaction given below.

 

            3 Cl2(g) + 2 Fe(s) ? 6 Cl?(aq) + 2 Fe3+(aq)

Fe(s) ? Fe3+(aq) ?? Cl2(g) ? Cl?(aq) ? Pt
Fe3+(aq) ? Fe(s) ?? Cl?(aq) ? Cl2(g) ? Pt
Cl?(aq) ? Cl2(g) ? Pt ?? Fe3+(aq) ? Fe(s
Fe(s) ? Cl2(g) ?? Fe3+(aq) ? Cl?(aq) ? Pt


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Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. (The equation is balanced.)

 

            2 K(s) + I2(s) ? 2 K?(aq) + 2 I?(aq)

 

K+(aq) + e? ? K(s)                E° = -2.93 V

I2(s) + 2 e?  ? 2 I?(aq)          E° = +0.54 V

+1.85 V
+3.47 V
+6.40 V
-5.32 V

Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C.

 

            3 Cl2(g) + 2 Fe(s) ? 6 Cl?(aq) + 2 Fe3+(aq)

 

Cl2(g) + 2 e? ? 2 Cl?(aq)       E° = +1.36 V

Fe3+(aq) + 3 e?  ?  Fe(s)      E° = -0.04 V

+4.16 V
-1.32V
+1.40 V
-1.40 V

. How many electrons are transferred in the following reaction? (The reaction is unbalanced.)

 

            I2(s) + Fe(s)  ?  Fe3+(aq) + I?(aq)

3
1
4
6
2

 


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