C8 Flashcards
(22 cards)
What do you measure to determine the rate of a chemical reaction (in general)?
Amount reactants used up or amount of products formed
What are the main two methods used to determine the rate of reaction?
Decreasing mass, volume of gas formed
What units are used for the rate of reaction?
g/s or cm³/s
What formula do we use to calculate the mean rate of reaction?
What theory explains how particles must behave in order to react?
Collision theory
What is the name used to describe the minimum amount of energy particles must have to react?
Activation energy
What happens to the rate of a chemical reaction if the surface area to volume ratio is increased?
Rate also increases
How does increasing temperature change the rate of a reaction?
Rate increases
What two things are affected by increasing temperature?
- Frequency of collisions
- Energy of particles
How does increasing the concentration of reactants change the rate of a reaction?
Rate increases
Why does increasing concentration affect the rate of reaction?
Frequency of collisions increases
What is the name of a substance that changes the rate of a reaction?
A catalyst
What is a special feature of catalysts that means they can be reused?
Not used up in a reaction
How do catalysts change the rate of a reaction?
Lower activation energy
What are some examples of catalysts used in industry?
- Iron
- Platinum
What is the name of a type of reaction where the products can turn back into the reactants?
Reversible reaction
What symbol is used to represent a reversible reaction?
What method can be used to follow a chemical reaction that produces a precipitate?
How long it takes for it to go cloudy
How do we calculate the rate of reaction at a specific time?
Draw a tangent and find the gradient
How can we calculate the initial rate of a reaction?
Draw tangent at time = 0s
Why does increasing pressure or concentration increase the frequency of collisions?
More particles in the same volume
What type of metals are usually used as catalysts?
Transition metals
