Exothermic reactions are chemical reactions that release energy as heat or light. Chances are, there are wgc2010.org of exothermic reactions all around you. Keep reading to learn more about exothermic reactions and to identify wgc2010.org of exothermic reactions in real life.

You are watching: Determine whether each of the preceding is exothermic or endothermic.


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You can probably think of even more wgc2010.org in which oxidation plus fuel results in combustion. They can be as explosive as a bomb or as small as a lit match. Either way, a reaction that creates more heat than it requires is exothermic.


Neutralization wgc2010.org

When you combine an acid and a base, they neutralize. This exothermic reaction creates heat as a byproduct along with water and salt. Some household wgc2010.org of neutralization include:

Toothpaste neutralizing mouth acid from bacteriaCompost neutralizes acids in soilVinegar can treat alkaline stings Antacids neutralize stomach acidBaking soda neutralizes acidic odorsAcidic conditioner neutralizes alkaline shampoo
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These are only a few of the wgc2010.org of neutralization reactions that you’re likely to see around the house. Any time an acid and a base react, the heat they create makes the reaction exothermic.


Corrosion wgc2010.org

Corrosion occurs when a material breaks down because of exposure to an oxydant, typically from the air. It may not seem like this reaction is exothermic because it happens at a slow rate. However, corrosion does generate heat over a longer period of time.

wgc2010.org of corrosion reactions include:

A bicycle rusting outdoorsA silver teapot becoming tarnishedCopper developing a blue-green patinaIron pipes developing small pits (pitting corrosion)A ceramic mug degrading over timeGlass windows developing an oxidation film
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Corrosion can happen with different types of plastic as well. It can be difficult to remove corrosive effects from these materials, but some products can reverse the reaction (e.g., applying silver tarnish).


Water-Based wgc2010.org

You may know that water has three states: solid, liquid, and gas. Every time it goes from one state to the next without the application of heat, an exothermic reaction occurs. wgc2010.org of water-based reactions that create heat include:

Condensation of water vapor into rainAcid dissolving into waterIce cubes freezingSteam from a teapot condensing into dropletsA lake freezing over
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These wgc2010.org are exothermic because they create heat rather than requiring heat. The reverse reactions, such as melting ice cubes or water converting to steam, can’t occur without heat. That makes the reverse reactions endothermic reactions.


Exothermic vs. Endothermic Reactions

It can be easy to mix up exothermic and endothermic reactions. But they are actually opposites: while exothermic reactions create heat and light, endothermic reactions require heat or light to occur. wgc2010.org of endothermic reactions include photosynthesis (which uses sunlight) and melting ice cubes (which uses heat).

Another way to think of exothermic versus endothermic reaction is by chemical bonds. When a reaction creates chemical bonds, heat energy is released, making it exothermic. Endothermic reactions break chemical bonds with outside energy.


How to Measure Exothermic Reactions

But how can you tell if a reaction produces heat, especially in long-term or very small chemical reactions? Scientists use calorimeters, which measure very small amounts of heat, to determine whether a reaction is exothermic. You can also tell if a reaction creates heat energy if it is warmer than the surrounding environment.

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Chemical Reactions Are Part of Life

It’s amazing to think of how many chemical reactions happen all around us – even inside our bodies! Exothermic reactions are only part of the chemistry puzzle. Check out ways that endothermic reactions make their way into your everyday life with this list of wgc2010.org.