reversible reactions Flashcards
what does equilibrium mean?
when the forward and backward rate of reactions begin to become stable, resulting in the concentration of products and reactants in a closed system to remain the same.
what is a reversible reaction
when reactants can react into products and products can react back into reactants.
describe the enthalpy of a forward reaction when it releases 71kJ into the surroundings compared to the backwards reaction.
the forward reaction is exothermic, meaning the backwards reaction would be endothermic.
what’s the rule about enthalpy in reversible reactions
if one reaction experiences a temperature change the other reaction will be the same but opposite.
what is le chatelier’s principle?
whatever change is made on the outside of a system, there is an internal opposing change that occurs naturally within the system.
what three factor can affect le chatelier’s principle?
temperature, pressure, concentration
if the forward energy change is negative would it be an exo/endo thermic reaction?
exothermic, because energy is being lost from the system to the surroundings.
do breaking bonds require or release energy? is this a exo or end thermic reaction?
breaking bonds require energy, meaning it is an endothermic reaction because energy is taken in.
do making bonds require or release energy? is this a exo or end thermic reaction?
making bonds release energy, therefore is an exothermic reaction because energy is given out.
State how can you find out the rate of a chemical reaction:
- by seeing how long it takes for products to be made
- by seeing how long it takes for reactants to be used up
what is collision theory.
theory which reactions can only take place when particles collide with each other, these particles need enough energy to successfully collide.
how does changing the surface area of a reactant effect the rate of reaction
how does changing the temperature of a reactant effect the rate of reaction
how does changing the pressure of a reactant effect the rate of reaction
