C2 Rates of Reaction Flashcards
What effect will increasing the temperature have on the rate of reaction?
Increase
What effect will decreasing the concentration of a solution have on the rate of reaction?
Decrease
What effect will using smaller pieces of solid have on the rate of reaction?
Increase
What will happen to the rate of reaction if the temperature is decreased?
Decrease
How does changing the surface area of a solid affect the rate of a reaction?
Increasing the surface area will increase the rate of reaction
How do you increase the surface area of a solid?
Break it up into smaller pieces
What do atoms need to do to react?
Collide with enough force
Why does increasing the temperature increase the rate of reaction?
Increasing the temperature gives the particles more energy, so they move faster. This means - they collide more often - they collide with more force
Why does increasing the concentration increase the rate of reaction?
A higher concentration means there are more particles present, so they are more likely to collide.
Why does increasing the surface area increase the rate of reaction?
More particles are available to react, so the number of collisions increases.
What effect does a catalyst have on the rate of reaction?
Increases the rate of reaction.
Why does a catalyst increase the rate of reaction?
It provides an alternative pathway that requires less activation energy.
How does increasing the pressure affect the rate of reaction?
Increases
Why does increasing the pressure increase the rate of reaction?
The particles are closer together therefore collide more often.
What are the different ways we can measure the rate of a reaction?
- Measure the time taken for a reactant to be used up. 2. Measure the volume of gas produced. 3. Measure the decrease in mass (if a gas is produced). 4. Measure the time taken for a cross to no longer be visible (if a solid is produced).
Which would react faster - a reaction at 50 degrees C or one at 80 degrees C?
80 degrees
Which would react faster - a reaction using 2.0M acid or one using 1.5M?
2.0M
Which would react faster, 2g of powdered limestone or limestone chips?
Powdered limestone
Give some advantages of using catalysts.
Reaction can be carried out at lower temperature so saves money and less pollution made Product can be made at a faster rate Catalyst does not get used up in the reaction
Give some disadvantages of using catalysts
Often very expensive Can be poisonous to the environment Different catalysts are needed for different reactions
What is a catalyst?
Something that speeds up the rate of a reaction without being used up.
What happens in an exothermic reaction?
Energy is released as heat and the temperature goes up.
What happens in an endothermic reaction?
Energy is taken in and the temperature goes down.
A reaction is carried out between zinc metal and copper sulfate. The temperature increases during the reaction. Is it exothermic or endothermic?
Exothermic - the temperature goes up.
