Topic #5: Energy Changes Flashcards Preview

Chemistry > Topic #5: Energy Changes > Flashcards

Flashcards in Topic #5: Energy Changes Deck (7):
1

What are endo and exothermic reactions?

Endo- takes in heat, positive enthalpy change
Exo- gives out heat, negative enthalpy change

2

Reaction profile features

Activation energy must be on
Curve
Final energy
Energy change

3

Formula for energy change?

Bonds broken - bonds formed = energy change

In endothermic, more energy is taken in to break bonds than is given out making them, and vice versa

4

What is a cell and a battery?

Cell- 2 metals in contact with electrolyte
Battery- 2 or more cells

5

Non-rechargeable batteries stop when?

When the reactants have all been used up

6

What are fuel cells?

Powered by oxidation of hydrogen to make water, only waste product is water

7

What are the disadvantages of hydrogen fuel cells?

Explosive hydrogen
Expensive to obtain
Not environmentally freindly to obtain
Needs storage tanks
Volatile