Exothermic and Endothermic Reactions Flashcards
What is transferred in Chemical reactions?
energy
What do chemicals do with energy?
They store it
What does it mean when products store more energy than the original reactants?
They must have taken in the difference in energy between the products and the reactants from the surroundings
What does it mean when products store less energy than the original reactants?
The excess energy was transferred to the surroundings
What happens to heat in an Exothermic Reaction?
Heat is given out
What is an exothermic reaction?
It transfers energy to the surroundings. This is shown by the rise in temp
What is the best example of an Exothermic reaction?
Burning fuels (Combustion) This gives out a lot of energy
What are some real-world products that use Exothermic Reactions?
Handwarmers use oxidation of iron in the air, Self heating cans
What happens to heat in an Endothermic Reaction?
Heat is taken in
What is an Endothermic Reaction?
It takes in energy from the surroundings, temp decreases
What are some examples of Endothermic Reactions?
The reaction between citric acid and sodium hydrogen carbonate, Thermal decomposition
What are some real-world products that use Endothermic Reactions?
Sports Injury packs
How can you measure the amount of energy released by a chemical reaction?
Take the temp of the reagents mixing them in a polystyrene cup, measure the temp of the solution at end of the reaction
How can you reduce the energy lost to the surroundings?
Put the polystyrene cup into a beaker of cotton wool with a lid on the cup
What are Reaction Profiles?
Diagrams that show the relative energies of the reactants
