C2.5 Exothermic and endothermic reactions

In what ways are endothermic reactions used every day?

Everyday uses of endothermic reactions include: • Sports injury packs. They take in heat and the pack becomes very cold- much more convenient than carrying ice around.

In what ways are exothermic reactions used every day?

Everyday uses of exothermic reactions include: • Hand warmers- they use the exothermic reaction of oxidation of iron in the air (with a salt solution catalyst) to generate heat. • Self-heating cans (eg for coffee)- rely on exothermic reactions between chemicals in their bases.

What is an example of a reversible reaction, and what is the equation?

The thermal decomposition of hydrated copper sulphate. A Bunsen burner is used to heat blue hydrated copper sulfate in order to drive the water away- endothermic. Water is added to the white anhydrous copper sulfate- exothermic.

What is an endothermic reaction?

Endothermic reaction: a reaction that takes in energy from the surroundings- usually as heat. Its reactants have more energy than its products.

What are some examples of types of reactions that are endothermic?

Endothermic reactions include: • Thermal decomposition.

What are some examples of types of reactions that are exothermic?

Examples of exothermic reactions include: • Combustion • Many oxidation reactions • Neutralisation.

What is an exothermic reaction?

Exothermic reaction: a reaction that transfers energy to the surroundings- usually as heat. The products have more energy than the reactants.

How do endothermic and exothermic reactions relate to reversible reactions?

If a reversible reaction is exothermic in one direction, it is endothermic in the opposite direction. The same amount of energy is transferred in each case.