Q:

What are chemical reactions that produce heat?

A:

Chemical reactions that produce heat are called exothermic reactions. Exothermic reactions involve physical or chemical changes that generate heat in various quantities, which is then dispersed into the surrounding environment. Exothermic reactions come in several forms, and require more energy to occur than they produce.

Exothermic reactions take place throughout the world and may occur in the water, land, and in the atmosphere. Examples of exothermic reactions include combustion reactions of fuels, the addition of concentrated acid to water (also called neutralization), the burning of certain substances, and the addition of water to anhydrous copper sulfate. Most exothermic reactions take place when triggered by an external catalyst, although some come from internally produced sources of heat, such as the eruption of volcanoes.

The reaction that occurs when metals oxidize and corrode is another type of an exothermic reaction, as respiration and even the decomposition of decaying plant and food matter into compost or humus. Some exothermic reactions, such as the combustion of fuels in car and plane engines, take place through mechanical means. Others, such as the decomposition of vegetable matter to waste, occur solely through natural forces. Exothermic reactions are the opposite of endothermic reactions, which result in systems absorbing heat energy from their surroundings.


Is this answer helpful?

Similar Questions

  • Q:

    What are chemical reactions that release energy?

    A:

    Chemical reactions that release energy are described by Education.com as exothermic reactions, and their equations follow the form: reactants = products + energy. Examples of exothermic reactions are explosions, such as fireworks, or combustion, such as with engines. The reactants of exothermic reactions contain stored energy which is then released as exothermic heat once the chemical reaction has occurred, states Scientific American.

    Full Answer >
    Filed Under:
  • Q:

    Where are combustion reactions used?

    A:

    Combustion reactions have a variety of uses including the burning of fuel that provides heat for the home or power for an automobile. Combustion of natural gas or propane gives the heat to cook one's food. Combustion of waste products powers generators while reducing the volume of the material to more manageable sizes.

    Full Answer >
    Filed Under:
  • Q:

    How do enzymes speed up chemical reactions?

    A:

    Enzymes speed up chemical reactions by lowering activation rates. In general, the lower amount of activation energy that a potential reaction has, the faster the rate of reaction will be. Enzymes change shape during the reaction process, which allows them to efficiently reduce activation rates.

    Full Answer >
    Filed Under:
  • Q:

    What are four types of chemical reactions?

    A:

    Synthesis, decomposition, substitution and double displacement are four types of chemical reactions. A synthesis reaction is when two or more reactants combine to form one product.

    Full Answer >
    Filed Under:

Explore