Negative v. Positive when calculating energy

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Ashita Tanwar 3H
Posts: 30
Joined: Fri Sep 28, 2018 12:23 am

Negative v. Positive when calculating energy

Postby Ashita Tanwar 3H » Sat Oct 13, 2018 5:54 pm

What does it mean when delta E turns out to be negative after calculating the energy difference between two energy levels? I'm not sure if the sign makes a difference

amogha_koka3I
Posts: 62
Joined: Fri Sep 28, 2018 12:24 am

Re: Negative v. Positive when calculating energy

Postby amogha_koka3I » Sat Oct 13, 2018 5:55 pm

It is negative because the electron's energy has decreased and the energy is released as electromagnetic radiation, hope this helps!

mahika_nayak_3L
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: Negative v. Positive when calculating energy

Postby mahika_nayak_3L » Sat Oct 13, 2018 6:13 pm

The negative sign means that the bound electron has a lower energy value that a free electron, and in the calculations the sign is negative because energy is released and decreasing as a result of the reaction. The distinction does matter and it is important to ensure that ΔE is calculated using the final minus the initial n level.

804994652
Posts: 68
Joined: Fri Sep 28, 2018 12:26 am

Re: Negative v. Positive when calculating energy

Postby 804994652 » Sat Oct 13, 2018 9:03 pm

Anytime energy is released it is considered negative.

904914909
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: Negative v. Positive when calculating energy

Postby 904914909 » Mon Oct 15, 2018 8:47 pm

When energy is released, it is negative/exothermic and when energy is absorbed, the reaction is positive/endothermic

Kaylee Kang 1G
Posts: 65
Joined: Fri Sep 28, 2018 12:24 am

Re: Negative v. Positive when calculating energy

Postby Kaylee Kang 1G » Mon Oct 15, 2018 10:53 pm

When delta E turns out to be negative, it means that the reaction released energy.

Chris Freking 2G
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

Re: Negative v. Positive when calculating energy

Postby Chris Freking 2G » Mon Oct 15, 2018 11:11 pm

When delta E is negative, it means that energy has been released. Positive delta E refers to the absorption of energy.

angelagd3l
Posts: 32
Joined: Fri Sep 28, 2018 12:26 am

Re: Negative v. Positive when calculating energy

Postby angelagd3l » Mon Oct 15, 2018 11:41 pm

Does the answer always have to be negative? Since its decreasing?

Sydney Tay 2B
Posts: 64
Joined: Fri Sep 28, 2018 12:20 am

Re: Negative v. Positive when calculating energy

Postby Sydney Tay 2B » Tue Oct 16, 2018 12:14 am

Since the electron is decreasing in energy levels, it is losing energy and therefore would have a negative value. However, as it decreases in energy level it releases a photon which has a positive value in order to offset the previous negative values since energy can neither be created nor destroyed.


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