1.5) Energy Changes Flashcards
What is an exothermic reaction?
A reaction that causes a rise in temperature to surroundings- it releases energy
What is an endothermic reaction?
A reaction that causes a decrease in temperature in the surroundings-it takes in energy
If a reversible reaction if exothermic in one direction what will it be in the reverse direction?
Endothermic
What is the activation energy?
The minimum amount of energy that particles must have to take place
Is breaking a bond in a chemical reaction an endothermic or exothermic process?
Endothermic
Is forming a bond in a chemical reaction an endothermic or exothermic process?
Exothermic
What determines if a reaction is exothermic?
If the energy released when bonds are formed is greater than the energy needed to break bonds
What determines if a reaction is endothermic?
If the energy needed to break bonds is more than the energy released as bonds formed
what is a fuel cell?
a fuel cell contains chemical energy into electrical energy in a similar fashion.
advantages of hydrogen fuel cells
Easy to maintain as there are no moving parts; small size; water is the only chemical product
disadvantages of hydrogen fuel cells
Very expensive to manufacture; need a constant supply of hydrogen fuel, which is a flammable gas
advantages of Rechargeable cells
Can be recharged many times before being recycled, reducing the use of resources
disadvantages of
