Ch - 8 (Rates of Reaction) Flashcards
What are the factors that affect the rate of reaction?
- Concentration of reactant in solution
- Pressure of reacting gases.
- Temperature
- Surface area of solid reactant
- Use of catalyst
What is one use of the rate?
Economic Interest
On a graph, of increased concentration or pressure, how will u determine the line with more concentration?
- Steeper line - Higher concentration
- Less steeper line - Less concentration.
On a graph, of surface area, how will u determine the line with more surface area?
- Steeper line - More surface area (powder)
- less steeper line - Less surface area (lumps)
On a graph, on temp, how will u determine the line with more temp?
- Steeper Line - Higher temp.
- Less steeper line - Lower temp.
What is a catalyst?
- Speeds up the rate of reaction, without being altered or consumed itself.
What is one important thing to note about a reaction?
Mass of reactant = Mass of product
On a graph, on catalyst, how will u determine the line with a catalyst?
- Steeper line - with a catalyst
- less steeper line - without a catalyst
What does the collision theory state?
- the particles must collide with each other
- collision must have sufficient energy to cause reaction
What is activation energy?
The minimum energy that colliding particles must have.
What is it called if a collision occurs?
Successful collisions.
What does the no. of successful collisions depend on?
- No. of particles per unit volume
- Frequency of collisions
- Kinetic energy of particles
- Activation energy
How does temp affect the rate of reaction?
Increasing the temp will increase the rate of reaction.
Explain according to particle theory the effect of temp.
- More frequent collisions
- Higher proportion of particles have energy greater than the activation energy.
What is the rule of thumb for aqueous and gaseous systems?
- For every 10°C increase in temp, the rate of reaction approx doubles.
