What is an exothermic reaction?

An exothermic reaction is a reaction that transfers energy to the surroundings, so the temperature of the surroundings increases.

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What is an endothermic reaction?

An endothermic reaction is a reaction that takes in energy from the surroundings, so the temperature of the surroundings decreases.

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What is a reaction (or enthalpy) profile diagram?

A diagram that shows the energy change during a chemical reaction.

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Give 3 examples of exothermic reactions.

  1. Combustion.
  2. Neutralisation.
  3. Oxidation.

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Give 2 examples of endothermic reactions.

  1. Citric acid + sodium hydrogen carbonate.
  2. Thermal decomposition.

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Exothermic. The energy of the products is lower than the reactants, so energy has been lost to the surroundings.

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Endothermic. The energy of the products is higher than the reactants, so energy has been gained from the surroundings.

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Do hand warmers and self heating cans use exothermic or endothermic chemical reactions?

Exothermic chemical reactions (they increase the temperature of their surroundings).

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Do sports injury cold packs use exothermic or endothermic chemical reactions?

Endothermic chemical reactions (they decrease the temperature of their surroundings).

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