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What is an exothermic reaction?
A reaction that releases energy to the surroundings, usually as heat.
Give an example of an exothermic reaction.
Combustion of fuels.
How can you tell a reaction is exothermic?
The temperature of the surroundings increases.
Write the word equation for the combustion of methane.
Methane + Oxygen → Carbon dioxide + Water
Why are exothermic reactions useful in everyday life?
They provide energy, e.g., for heating or powering engines.
Is respiration exothermic or endothermic?
Exothermic, as it releases energy.
What happens to bonds during an exothermic reaction?
Bonds are formed, releasing energy.
How is energy transferred in an exothermic reaction?
To the surroundings as heat.
Why does the temperature increase during an exothermic reaction?
More energy is released than absorbed.
What type of reaction occurs in hand warmers?
Exothermic reaction, often the oxidation of iron.
Is the neutralization of an acid and an alkali exothermic or endothermic?
Exothermic.
Write a chemical equation for an exothermic reaction.
2H2+O2→2H2O+energy
Why are fuels considered exothermic?
Their combustion releases large amounts of energy.
What type of reaction occurs when water freezes?
Exothermic, as energy is released to the surroundings.
What is the role of exothermic reactions in energy production?
They are used to generate heat or electricity.
