Rate of reaction Flashcards
What is the relative rate equation?
relative rate= 1/time
4 Factors effecting rate
Concentration
Surface area
Temperature
Catalyst
Catalyst definition
A catalyst provides an alternative reaction pathway with a lower activation energy.
2 Methods of measuring rate?
- Using a gas syringe to measure gas produced.
2. Weighting substance before and after to see mass loss of gas.
Activation energy definition
The minimum energy required by colliding particles to form activated complex.
What is the relationship between activation energy and rate?
Smaller the activation, the faster the reaction occurs.
What 2 things do particles need for collisions to be successful?
- Energy greater or equal activation energy.
2. Correct collision geometry
Activated complex definition?
The activated complex is the unstable immediate arrangement of atoms, as new bonds form and old ones break
By how much does the rate of reaction increase by every 10*C increase in temp?
It roughly doubles.
What do energy distribution graphs show?
Y axis- number of particles
X axis- kinetic energy
What direction is the Ea shifted in a energy distribution graph when a catalyst is added?
Left
Heterogeneous catalyst definition?
The catalyst and reactants are in different states
Homogeneous catalyst definition?
The catalyst and reactants are in the same state.
Homo=1
Enthalpy change equation
H=Hproducts - Hreactants
