CHAPTER 8

Question 1

what is normal melting point

Answer 1

the temperature where a solid and liquid can coexist at a pressure of 1atm.

Question 2

what is normal boiling point

Answer 2

the temperature where liquid and vapour can coexist at a pressure of 1atmw

Question 3

when does a liquid vapourize

Answer 3

when it leaves the liquid phase faster than when captured by the gas phase

Question 4

when does a gas condense

Answer 4

when it leaves the gas phase faster than when captured by the liquid phase

Question 5

explain dispersion forces

Answer 5

when the negatively charged electron cloud of a molecule attracts the positively charged nuclei of a neighbouring molecule

Question 6

explain ion-dipole

Answer 6

when an ion is attracted to a permanent dipole

Question 7

explain why the boiling point of n-pentane is higher than the boiling point of 2,2-dimethylpropane

Answer 7

n-pentane has an extended electron cloud making it bigger and more polarizable meaning it will have a higher boiling point compared to 2,2-dimethylpropane which is more compacted