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Select the effect on the energy of a system in each case.

Action Energy A proton moves away from another proton. 1 decreases
nochange    
increases
Two electrons move toward one another.
2 decreases
nochange    
increases
An electron moves away from a proton.
3 decreases
nochange    
increases
Two neutral sodium atoms move toward oneanother.
4 decreases
nochange    
increases
A cation moves toward an anion.
5 decreases
nochange    
increases

1 decreases
nochange    
increases
1 decreases
nochange    
increases
1 2 decreases
nochange    
increases
2 decreases
nochange    
increases
2 3 decreases
nochange    
increases
3 decreases
nochange    
increases
3 4 decreases
nochange    
increases
4 decreases
nochange    
increases
4 5 decreases
nochange    
increases
5 decreases
nochange    
increases
5 Action Energy A proton moves away from another proton. 1 decreases
nochange    
increases
Two electrons move toward one another.
2 decreases
nochange    
increases
An electron moves away from a proton.
3 decreases
nochange    
increases
Two neutral sodium atoms move toward oneanother.
4 decreases
nochange    
increases
A cation moves toward an anion.
5 decreases
nochange    
increases

Explanation / Answer

1) Decreases. The protons will naturally try to move away from eachother because they carry the same charge, so you have a decrease inpotential energy when they do. 2) Increases. Because they have the same charge, they want to moveaway from each other [same as the protons] so when they get closer,PE [potential energy] increases. 3) Increases. They naturally want to move closer because oppositesattract. So PE increases when they move away. 4) No change. They're neutral. no charge 5) Decrease. This is the same reason as #3.

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