inorganic-enthalpy of formation

Question 1

standard enthalpy of formation is

Answer 1

the enthalpy change when one mole of a substance is formed from its elements in their standard state

Question 2

the 3 standard states are

Answer 2

1-atmosphere pressure
1 mol l^-1 concentration
298k(25 degrees)

Question 3

entropy of a system is a

Answer 3

measure of the disorder present, the greater the entropy the greater the disorder

Question 4

entropy increases when

Answer 4

the temperature rises
substance melts, boils or dissolve(solids have low entropy and gases have high entropy)

Question 5

the second law of thermodynamics states

Answer 5

that the entropy of a reaction system and its surroundings increases for a spontaneous process.

Question 6

The third law of thermodynamics states

Answer 6

that the entropy of a perfect crystal at 0K is zero

Question 7

for a reaction to be feasible it has to

Answer 7

have a negative change in free energy between reactants and products.

Question 8

a reaction can not go faster than the

Answer 8

slowest step in the mechanisms. this is called the rate-determining step