Energetics Flashcards
(6 cards)
1
Q
How do you know a reaction is exothermic?
A
Energy is released to surroundings
- measure temp. rise
- deltaH is negative
- more energy is released when bonds are made in the products than what is absorbed to break them in the reactants
2
Q
How do to know a reaction is endothermic?
A
Energy is absorbed from surroundings
- measure temp. decrease
- deltaH is positive
- more energy is absorbed breaking bonds in the reactants than is released when bonds are made in products
3
Q
What is the equation for enthalpy change?
A
Q = m x c x deltaT
4
Q
What is bond breaking?
A
An endothermic process - needs energy
5
Q
What is bond making?
A
An exothermic process - releases energy
6
Q
What is bond energies?
A
energy required to break 1 mole of covalent bond
