Year 11 Recap

Question 1

What is activation energy? (Ea)

Answer 1

the energy required to increase the energy of the reactants such that they undergo the reaction

Question 2

What is the enthalpy of the reaction?

Answer 2

the difference in energy of the reactants and products (the amount of energy released or absorbed by the reaction)

Question 3

What is intermolecular bonding?

Answer 3

the bonds that exist BETWEEN molecules

Question 4

What are the 3 types of intermolecular bonding?

Answer 4

dispersion forces
dipole dipole bonding
H bonding

Question 5

Dispersion forces?

Answer 5

very weak intermolecular bonds
exist between all molecules
dispersion forces increase with molar mass (as more electrons)

Question 6

What is different about dispersion forces compared to diople diple and H bonding?

Answer 6

they are the only intermolecular bonds between non polar moelcueles

Question 7

What is net dipole?

Answer 7

when dipoles in a molecule add up, + and - end.

Question 8

Dipole-dipole bonding?

Answer 8

when molecules with net dipoles bond. (Stronger than weak dispersion forces)

Question 9

Hydrogen bonding is

Answer 9

intermolecular, strong dipole-dipole bonds

H atom bonded to N,O,F atom .

Question 10

Dipole dipole bonds depend on what?

Answer 10

the attraction between the negative part of one molecule and the positive part of another
(only work in polar molecules)

Question 11

What is solubility a result of?

Answer 11

Solute X will dissolve solute Y if the intermolecular bonds in each are of similar strength