Endothermic & Exothermic- Which is Positive & Which is Negative
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Endothermic & Exothermic- Which is Positive & Which is Negative

[From: ] [author: ] [Date: 11-04-26] [Hit: ]
Kelly :-)-A + B ->C + 180kJ This one is exothermic. The + indicates that energy has been given out the the surrounding area (commonly in the form of heat).-There are two common ways to indicate if a reaction is exo or endothermic.Method 1 is to put the energy term in the chemical equation as in your first example. When the heat term is on the product side then heat is produced = exothermic.The second method is to indicate the change in heat,......
Hey, thanks for coming :-)

So I'm getting confused about this.. if I have substances A + B --> C + 180 kJ is the forward reaction exothermic or endothermic?

If I have substances A + B --> C -180 kJ is the forward reaction exothermic or endothermic?


THANKS I REALLY APPRECIATE IT :-)
Kelly :-)

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A + B ->C + 180kJ This one is exothermic. The + indicates that energy has been given out the the surrounding area (commonly in the form of heat).

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There are two common ways to indicate if a reaction is exo or endothermic.

Method 1 is to put the energy term in the chemical equation as in your first example. When the heat term is on the product side then heat is "produced" = exothermic. If you wanted to show the reaction was endothermic you would put the heat term on the reactant side as in A + B + 180 kJ = C

The second method is to indicate the "change in heat", known as delta H (the "delta" is actually a triangle), somewhere off to the side. I THINK that is what you are trying to show in your second example but it isn't exactly clear. You would write the reaction: A + B = C and then you would put, off to one side,
"delta"H = - 180 KJ. If you wanted to show the reaction was endothermic the "delta" H would be a +180 KJ

You don't normally see an equation with the heat term written as a negative as in your second example.,

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When its positive, it means energy has been added to the reaction, aka u used some energy, so its endothermic.
When its negative, u released energy and its exothermic.
Right?

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Exothermic means there is a release of energy in the equation.

Endothermic means there is a consumption of energy in the equation, meaning the area around it gets cold when the reaction occurs.

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Endo is IN
Exo is OUT

When you squish a sponge and put it in the water, it sucks up water. Thats Endo
When you take it out and squish it and all the water blasts out, thats exo.

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Endothermic reactions consume energy. Exothermic reactions emit energy.

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Sorry, I needed 2 points.
1
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