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Which of the following processes is spontaneous? Check all that apply. a. The battery in a cell...

Question:

Which of the following processes is spontaneous? Check all that apply.

a. The battery in a cell phone discharging

b. Radioactive decay

c. A rose blooming

d. A helium balloon rising above Earth's surface

But I would greatly appreciate an explanation for what the correct answer is. When the assignment told me this answer was incorrect, it also provided a hint that stated, "Are radioactive isotopes stable? What occurs in a radioactive element over time?" & the hint for the over all problem is: For each process described, we will decide whether it is spontaneous or non spontaneous. What makes a process spontaneous? Which, if any, of the processes requires an input of chemical resources or of energy in order to occur?

Spontaneous Reaction

Spontaneous reaction occurs without input of external energy. For a redox reaction, the overall cell potential would be positive for a spontaneous reaction. The {eq}\Delta G {/eq} of a spontaneous reaction is negative and the equilibrium constant of a spontaneous reaction would be greater than 1.

Answer and Explanation: 1

The spontaneous reaction would be:

a. The battery in a cell phone discharging

  • battery discharge is spontaneous. The energy generated is then used to power the cell phone.

b. Radioactive decay

  • radioactive isotope are unstable and so they undergo radioactive decay to a more stable isotope.

d. A helium balloon rising above Earth's surface

  • this is also a spontaneous process because the lower density of He vs air. This allows greater distribution of position for the He atoms.

c. A rose blooming would require input of energy from the sun.


Learn more about this topic:

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Spontaneous Process: Definition & Examples

from

Chapter 13 / Lesson 9
20K

Learn about spontaneous process and reaction. Understand what a spontaneous reaction is, how it processes, factors determining spontaneity, and see examples.


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