C5 Flashcards
What is an exothermic reaction?
Reaction the transfers energy from the reactant molecules to the surrounding
What is an endothermic reaction?
A reaction which takes in energy from the surroundings
What is activation energy?
The minimum amount of energy that particles need to react
Breaking bonds in is an example of what type of reaction?
Breaking bonds is an example of endothermic reaction (+) symbol,energy is gained
Making bonds is example of what type of reaction?
Making bones is an Exothermic (-) symbol, energy is lost
what is a reaction profile
a graph which shows the relative energies of reactants and products, as well as activation energy
what is a cell
A cell is composed of two electrodes dipped in an electrolyte solution. it produces electricity from a chemical reaction
what is a battery
consisted of two more cells connected in series
why is electrolysis used to extract metals
some metals are too reactive to be extracted using carbon
where do metals go in electrolosys
cathode
What happens to non metals in electrolysis
Loses electrons
(Oxidised)
What happens to metals in electrolysis
Gain electrons
(Reduced)
hot sodium is put in a jar of chlorine
what happens
before
during
after
reaction
before-silver solid
during-yellow flame
after-white powder
What happens to non metals in electrolysis
Gain electrons(reduces)
