UNIT 3 Flashcards
(38 cards)
What does it mean if atom economy is 100%?
All of the reactant is converted to product
What is molar volume?
The molar volume of a gas is the volume occupied by 1 mole of a gas at a stated temperature and pressure
What is activation energy?
Activation energy is the minimum kinetic energy required for a reaction to occur
How does a catalyst work in a potential energy diagram?
Catalysts work by providing an alternative pathway for a reaction which is lower in energy
What does a catalyst do to the activation energy?
Catalysts lower the activation energy required for molecules to collide successfully
What are heterogeneous catalysts?
Heterogeneous catalysts are in a different state from the reactants
What are homogeneous catalysts?
Homogeneous catalysts are in the same state as the reactants
Do catalysts have an effect on 🔺H?
No
What is exothermic?
Heat given out to the surroundings
What is endothermic?
Energy absorbed from the surroundings
What is it when energy is required to break bonds?
Endothermic
What is it when energy is released when new bonds are made?
Exothermic
How to work out activation energy?
EA - Reactants
How to work out enthalpy change?
Products - Reactants
How to work out reverse Activation Energy?
EA - Products
How to work out reverse Enthalpy Change?
Reactants - Products
What is enthalpy of combustion?
The enthalpy of combustion is the heat energy given out when 1 mole of fuel burns completely in oxygen
What does the draught shield do?
Keeps heat in
What does Hess’s Law state?
That enthalpy change for a reaction depends only on the initial and final states of the reaction and is independent of the route by which the reaction may occur
What does Le Chatelier’s principle state?
That if a system at equilibrium is subjected to any change, the system will adjust itself to counteract the applied change
What does a catalyst do to equilibrium?
Increases the rate of the forward and the backward reaction allowing equilibrium to be reached faster
Does a catalyst affect the position of equilibrium?
No
What does an increase in concentrations of reactants favour?
The products
What does a decrease in concentrations of reactants favour?
The reactants
