thermodynamics and kinetics, heat work and molecules

Question 1

what are thermodynamics and kinetics

Answer 1

thermodynamics tell us whether the reaction is feasible and the energetic changes involved, energy changes

kinetics tells us how fast chemical changes happen, rates of reaction

Question 2

what is potential energy

Answer 2

stored energy of an object

Question 3

on an energy diagram, what do the Ea curve and net energy change stand for

Answer 3

Ea - ROR

E change - determines if the reaction is spontaneous

Question 4

what is internal energy

Answer 4

the total contributions from all the energies of a molecule

Question 5

what assumptions is the kinetic theory of gases based on

Answer 5

1) gas consists of molecules of mass (m) and diameter (d) which are in constant random motion
2) Size of molecules is negligible compared to the average distance travelled
3) no interactions between molecules except thru perfect elastic collisions.

Question 6

what are elastic collisions

Answer 6

collision where the total translational kinetic energy of the molecules is conserved.

Question 7

what is temperature

Answer 7

measure of the amount of kinetic energy the particles in a material have

Question 8

what is heat

Answer 8

a form of energy can flow between two objects of different temperatures

Question 9

how is heat conducted between objects

Answer 9

collisions between the molecules at the interface, some momentum also exchanged

Question 10

what is work

Answer 10

the specific form of energy, done when a force moves through a distance, W=Fd

Question 11

how to combine work and pressure

Answer 11

Force = P x A
w = P x A x (d2 - d1) 
w= P(Ad2 - Ad1) 
= P(V2 - V1) 
=P(deltaV)

Question 12

what are the types of elementary steps of a chemical process

Answer 12

bimolecular - single collision between two molecules

unimolecular - dissociation or isomerisation of a single molecule (eg cyclopropane to propene)