energ changes - cells and batteries

Question 1

what happens when we take 2 different metals and place them into an electrolyte?

Answer 1

we produce electricity

Question 2

what is an electrolyte?

Answer 2

a solution that can conduct electricity e.g solution of ionic compound

Question 3

what do cells produce?

Answer 3

electricity

Question 4

how long do cells produce electricity for?

Answer 4

only for a certain period of time until eventually the chemicals in the cell run out and reaction stops

Question 5

what is another factor for cells producing electricity?

Answer 5

if we use metals with different reactivities

Question 6

A _______ difference between the _________ of metals = a greater ____________ produced by a _____

Answer 6

greater, reactivity, potential difference, cell
e.g magnesium and copper have a big potential difference
zinc and tin only have a small p.d

Question 7

what else affects the p.d?

Answer 7

the electrolyte

Question 8

what does a battery contain?

Answer 8

2 or more cells connected in series to produce a greater voltage

Question 9

what are alkaline batteries?

Answer 9

they are batteries where the reactants can run out and no more electricity will be produced. you cannot reverse these reactions as they are non-rechargeable

Question 10

what are rechargeable batteries?

Answer 10

batteries where chemical reactions can be reversed when electrical current is applied