Reactions Flashcards
How do you tell if a reaction has happened
There could be a change in colour, temperature, weight or fizzing
What is a physical reaction
A reaction like melting or cutting that is reversible
What is a chemical reaction
A reaction where chemical bonds change
What is an endothermic reaction
A reaction where the system gets colder as it takes energy in from its surroundings
What is an exothermic reaction
A reaction where the system heats up as the energy is released into the surroundings
If chemical bonds are made, will it be an endo or exothermic reaction
Exothermic
Why does the system’s temperature increase during an exothermic reaction
Chemical bonds are being made, which means that energy is released, increasing the temperature
What is oxidation
Where oxygen is added to a reaction
What is reduction
Where oxygen is removed from a reaction.
What is a catalyst
A substance that is not used up in the reaction but speeds it up
What is the energy barrier
The amount of energy needed for a reaction to start
What is combustion
Burning
How does a fire extinguisher work
It removes one part of the fire triangle
What is the fire triangle
Three things needed for a fire to start
Heat, fuel, oxygen
What is thermal decomposition
The breaking down of a system under heat
