The activation energy: Exothermic chemical reactions

How large the activation energy is depends on the reaction partners and the given conditions. The activation energy cannot or does not always have to be supplied as heat - do my php assignment . It can also trigger the chemical reaction as light or in the form of mechanical work.

In the case of bang biscuits, for example, the chemical reaction that leads to the bang is activated by mechanical energy. Sometimes the thermal energy present in the environment is sufficient as activation energy.

The rusting of iron in air and the hardening of a cement-gravel-water mixture to concrete are such reactions. In chemical reactions - solve my chemistry problem , substance transformations are always associated with energy transformations, e.g. combustion of magnesium.

In chemical reactions, substance transformations are always associated with energy transformations, e.g. combustion of magnesium.

Exothermic chemical reactions

Chemical reactions in which thermal energy is released in the form of heat are called exothermic chemical reactions. Energy is released that can be used, for example, to emit heat and light or to perform electrical or mechanical work - https://domyhomework.club . The reaction products have a lower energy content than the starting materials. The heat of reaction Q has a negative sign.

Typical exothermic reactions are, for example, the burning of petrol in the cylinder of an engine or the burning of coal in a furnace. The following applies to all these reactions: The energy stored in the starting materials is greater than the energy contained in the reaction products. This energy difference is also called the heat of reaction.

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