Question

In order to break water into hydrogen and oxygen, water is heated to more than 500°C. Which kind of reaction is this and
why?
It is endothermic because heat needs to be absorbed by the reactants to form the products.

It is exothermic because heat needs to be released by the reactants to form the products.

It is endothermic because heat needs to be released by the reactants to form the products.

It is exothermic because heat needs to be absorbed by the reactants to form the products.

Answer 1

It is exothermic because heat needs to be released by the reactants to form the products.

Splitting of water molecules

Water molecule is made up of two atoms of hydrogen and one atom of oxygen. That is H2O.

An exothermic reaction is the reaction in which energy, in the form of heat, is released into the environment. Some examples of exothermic reaction are:

• Splitting of water molecules

• Rusting of iron and

• Burning of sugar.

Splitting of water molecule involves a process called thermal dissociation reaction which uses high temperature to split water molecules into its two components such as hydrogen and oxygen.

Here, the reactants absorbs the heat which is needed to form the products.

Learn more about exothermic reaction here:

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