Question

Q1: Rank compounds in order of decreasing vapor pressure, assuming neat (e.g., pure).

- water

- methanol

- acetone (CH₃)₂CO

Q2: Which molecule would be expected to expect the highest boiling point as a pure substance that are molecular isomers with the same molecular formula, C5H12? 10 vs 40 ⁰C.

- neopentane ( Hint: (CH3)4 C )

- normal pentane or n-pentane ( Hint: CH3 (CH2)3 CH3 )

Q3: Indicate the following families, or trending groups or clusters on a periodic table.

- metals

- nonmetals

- metalloids

- noble gas

- chalcogens

- alkali metal cations

- pnictogen

- transition metal cations

- alkaline earth metals

- halogen

Answer 1

Q1: Rank compounds in order of decreasing vapor pressure, assuming neat (e.g., pure).

as P vap decreases ---> Tboil increases; therefore

- water = lowest

- methanol = highest

- acetone (CH3)2CO = medium

Q2: Which molecule would be expected to expect the highest boiling point as a pure substance that are molecular isomers with the same molecular formula, C5H12? 10 vs 40 0C.

The more linear, the higher BP

- neopentane ( Hint: (CH3)4 C )

- normal pentane or n-pentane ( Hint: CH3 (CH2)3 CH3 ) they have the same (since they are the same)

Q3: Indicate the following families, or trending groups or clusters on a periodic table.

- metals - all those on the left, right

- nonmetals -- all those on the group 7,8 and N,C, O, P, Si,

- metalloids -- elemnts such as B, Si, Ge, As, Sb, Te

- noble gas - family 8 (right column)

- chalcogens - all those on gorup 6A (oxygen family)

- alkali metal cations - Those on Group IA, such as Na,Li, K, etc...

- pnictogen -- all those in the Nitrogen Family (Group 5A) such as N, P , As, Sb, etc..

- transition metal cations -- All those between group 2A and 3A (metals starting from Sc to Cn

- alkaline earth metals - those on Group 2A (calcium, Ba, Mg, etc..)

- halogen