Topic 4: Chemical Reactions and Energy Flashcards
What is an exothermic reaction?
A reaction that transfers energy from the reacting molecules to the surroundings.
What will happen to the surroundings of an exothermic reaction?
The temperature will increase. (Hotter)
What is are 3 examples of exothermic reactions?
Combustion
Neutralisation
Hand warmers
What is combustion?
A reaction involving a fuel burning in oxygen.
What is neutralisation?
The reaction between an acid and a base to form a salt plus water.
What is an energy profile?
Graphs that show the reaction
In an exothermic energy profile, do the reactants or the products have less energy? Why?
Products. Energy is transferred from the reaction to the surroundings.
How do you calculate the energy transferred in an exothermic energy profile?
Reactants - products = energy transferred
What is an endothermic reaction?
A reaction that takes in energy from its surroundings.
What happens to the surroundings of an endothermic reaction?
The temperature decreases.
What is are 4 examples of endothermic reactions?
In an endothermic energy profile, do the reactants or the products have less energy? Why?
Reactants. Energy is taken in from the surroundings.
How do you calculate the energy taken in an endothermic energy profile?
Product - reactant = energy taken in
What is the activation energy?
The peak.
How do you calculate activation energy?
The peak - reactants = activation energy
