Flashcards in Collision Theory, Reactions, Catalysts Deck (18):
What happens when the temperature is increased?
When the temperature is increased the particles all move quicker , if they're moving quicker theyre going to collide more often
What does it mean in terms of reaction when is solution is made more concentrated?
It means there are more particles of reactant between the water molecules which makes collisions more likely
What does larger surface area mean in terms of reaction ?
This means the particles around The broken up reactant will have more area to work on so there will be more frequent collisions
What is the definition of a catalyst?
A catalyst is a substance which speeds up a reaction without being changed or used up in the reaction
How does a solid catalyst work?
A solid catalyst works by giving the reacting particles a surface to stick to which increases the number of successful collisions
What is the main advantage of using a catalyst for industrial purposes?
Catalysts increase the rate of reaction, which saves a lot of money as the plant doesn't need to operate for as long to produce the same amount of stuff
How do catalysts reduce the energy costs for industrial purpose?
A catalyst will allow the reaction to work at a much lower temperature which reduces the energy used up in the reaction which is good for sustainable development to save money
Name the disadvantages of using the catalyst
1) expensive to buy and after need to be removed from the product and cleaned
2) different reactions use different catalysts so if you make more than one product at your plant you're probably need to buy different catalysts
3) Catalysts can be poisoned by impurities and stop working
What is an exothermic reaction?
An exothermic reaction gives out energy to the surroundings in the form of heat and shown by a rise in temperature
What is the best example of an exothermic reaction?
Burning fuels which is called combustion
Name three exothermic reactions
1) Burning fuels
2) neutralisation reactions
3) oxidisation reactions
What is an endothermic reaction?
An endothermic reaction takes in energy from the surroundings in the form of heat and shown by a fall in temperature
When do endothermic reactions take place?
In thermal decomposition
According to the collision theory what must happen in order for two particles to react?
They must collide with enough energy
Why doesn't increase in concentration of solutions increase the rate of reaction?
There will be more frequent collisions so the rate of reaction will increase
Give a definition of a catalyst
A catalyst is a substance which speeds up a reaction without being used up in the reaction
And endothermic reaction happens when ammonium nitrate is dissolved in water. Predict how the temperature of the solution will change during the solution
The temperature will decrease