Unit 16 Flashcards
(11 cards)
Define oxidation number
The charge atoms in a molecule will develop if the most electronegative atom in the molecule took electrons from the least electronegative atom
What must the oxidation numbers of all atoms in a molecule add up to
The charge of the molecule
What is oxidation
When an atom loses electrons
What is reduction
When an atom gains electrons
Would there ever be a case where oxidation could occur without reduction
No
What is the charge of a cathode
Positive
What is the charge of an anode
Negative
What are the 3 reactants for a lead acid battery
PbO2+Pb+H2SO4
Why are some batteries rechargeable and others are not
Because in some batteries the internal structure gets destroyed and the reaction can not be reversed
What are the differences between alkaline dry cell and lead acid batteries
Alkaline dry cell can not be recharged has no aqueous solution
Lead acid batteries can be recharged has an aqueous solution
When is a reaction a redox reaction
When the oxidation number changes in atoms from the reactant side to the product side
