Rate Of Reaction Flashcards
(12 cards)
Explain the difference in rate of reaction.
If you were to use sugar cube it would take longer to dissolve in the tea because the particle have to work around the sugar cube to get to the middle. Whereas a spoonful of sugar would dissolve much quicker because the particle can access it much easier.
Why will the sugar dissolve quicker than the sugar cube?
Because the particles can access all of the sugar but it has to work its way to the middle of the cube until it dissolves.
What name is given to the minimum amount of energy needed by particles for them to react when they collide?
Activation energy
Catalytic energy
Threshold energy
Activation energy
What is the name of the model which is used to explain how different factors affect the rate of a reaction?
Particle theory
Big Bang theory
Collision theory
Collision theory
What piece of apparatus could be used to measure the volume of gas produced in a reaction
Gas syringe
Beaker
Top pan balance
Gas syringe
Which of the following is a possible unit for rate of reaction?
cm3/s
m/s
N
cm3/s
Which of the following would speed up a reaction?
Using lumps instead of powder
Increasing the concentration of an acid
Decreasing the temperature
Increasing the concentration of an acid
Which of the following will increase the frequency of successful collisions?
Increasing the temperature
Decreasing the pressure
Decreasing the concentration
Increasing temperature
Which of the following has the smallest surface area to volume ratio?
Powder
Gauze
Lumps
Lumps
Which of the following statements about catalysts is false?
They speed up reactions
They provide an alternative reaction pathway with a lower activation energy
They become chemically changed at the end of the reaction
They become chemically changed at the end of the reaction
Which of the following will increase the proportion of successful collisions?
Increasing the temperature
Increasing the pressure
Increasing the concentration
Increasing the temperature
Which of the following would give a steeper curve on a graph of volume of gas against time?
Low temperature
Low concentration
Using a catalyst
Using a catalyst
