Combined Chemistry - C5 Energy Changes Flashcards
Name the following reactions that:
a) Take in heat from the surroundings
b) Give out heat to the surroundings
a) Endothermic
b) Exothermic
Name the type of reaction used in self-heating cups and hand warmers.
Exothermic reaction
Give an example of a chemical reaction that is exothermic.
Examples include: Combustion, Oxidation, Neutralisation
How do you know the reaction profile below is for an exothermic reaction?
Energy of products is lower than the energy of reactants
What can be said about the amount of energy before a chemical reaction and the amount of energy after a chemical reaction?
They are equal
Give an example of a chemical reaction that is endothermic.
Examples include: Thermal Decomposition and Reacting Citric Acid with Sodium hydrogencarbonate
Name the type of reaction is used in sports injury packs.
Endothermic reaction
How do you know the reaction profile below is for an endothermic reaction?
Energy of products is higher than the energy of reactants
Draw an energy level diagram (reaction profile) for an exothermic reaction.
What is the name for the minimum amount of energy needed for a reaction to happen?
Activation energy
Draw an energy level diagram (reaction profile) for an endothermic reaction.
Look at the reaction profiles below. Which arrows show the activation energy and which arrows show the overall energy change?
