The rate and extent of chemical change Flashcards
What are the two equations to calculate rate of reaction?
Rate of reaction = amount of reactant used / time
Rate of reaction = amount of product formed / time
What are the three units for rate of reaction?
- g/s
- cm³
- mol/s
How do you find the rate of reaction at a specific time graphically?
- Draw a tangent to the curve on the graph.
- Construct a right-angle triangle using the tangent as its hypotenuse.
- Calculate the gradient (difference in y’s / difference in x’s).
- Include units.
Which five factors affect the rate of reaction?
- Concentration
- Pressure
- Surface area
- Temperature
- Catalysts
What does collision theory state?
Chemical reactions can occur only when reacting particles collide with each other and with sufficient energy.
What is the definition of activation energy?
The minimum amount of energy needed to start a reaction.
How does increase of concentration affect the rate of reaction?
How does the increase of pressure of gases affect the rate of reaction?
How does the increase of surface area of solids affect the rate of reaction?
How does the increase of temperature affect the rate of reaction?
What is the definition of catalyst?
How do catalysts affect the rate of reaction?
It provides an alternative pathway for the reaction as it lowers activation energy. This means that a higher proportion of reactant particles have sufficient energy to react, increasing the frequency of effective collisions, increasing the rate of reaction.
What are the three common ways of measuring rate of reaction?
Describe a method to find the rate of reaction by measuring loss of mass.
Describe a method to find the rate of reaction by measuring volume of gas.
