Reactions Flashcards
How do you produce energy using a simple cell?
2 electrodes and an electrolyte generate electricity.
Why is a reaction exothermic?
Relate to bonds
The energy needed for bond breaking is less than the energy released in bond making.
How do you produce energy using a hydrogen fuel cell?
Hydrogen is a potential fuel that reacts with oxygen to generate electricity in a fuel cell.
List 4 methods to produce energy.
- Radioactive isotopes
- Combustion of fuels
- Hydrogen fuel cells
- Simple cells
Why is a reaction endothermic?
The energy released in bond making is less than the energy needed for bond breaking.
Define exothermic reactions.
Reactions where energy is given out of the surroundings because the products contain less overall energy than reactants.
Does bond breaking release/require energy?
Require
Define endothermic reactions.
Reactions where energy os taken in from the surroundings because the products contain more overall energy than the reactants.
How do you produce energy using radioactive isotopes?
Bombard uranium-235 with neutrons which splits the atom into smaller atoms, more neutrons and lots of energy.
Does bond making release/require energy?
Release
