Energy changes 5

Cards (12)

What is exothermic reaction? 
energy to surroundings
What is endothermic reaction?
taken in heat energy from the surroundings
What is activation energy? The minimum amount of energy required for a chemical reaction to occur.
What is avogadros constant?
6.022 x 10^23 (number of particles in one mole of a substance)
What is bond energy?
The energy required to break a chemical bond.
What is breaking a bond called?
endothermic
What is forming a bond called? 
exothermic
What are cells?
use chemical reactions to produce electricity.
What are batteries? 
two or more cells connected together in series.
What are rechargeable batteries?
Batteries that can be recharged.
What are non-rechargeable batteries?
Batteries that can not be re charged
Equation for fuel cells:
hydrogen + 02 -> water