optical isomerism And Test Tube Reactions

Question 1

State the relationship between two chiral molecules with the same structural formula.

Answer 1

non-superimposable mirror images

Question 2

Give the chemical formula of the reagent used to test for the following ion and the observation made.

CO32-

Answer 2

reagent: acid
observation: effervescence

Question 3

Give the chemical formula of the reagent used to test for the following ion and the observation made.

SO42-

Answer 3

reagent: BaCl2
observation: white precipitate

Question 4

define chiral centre

Answer 4

the carbon which is attached to four different groups

Question 5

give another name for chiral centre

Answer 5

asymmetric carbon
stereogenic centre

Question 6

How to form a racemic mixture

Answer 6

Enantiomer/optical isomer has a planar shape so it’s flat so there’s an equal chance of nucleophile attacking from either side which results in equal proportions of each enantiomer forming a racemic mixture

Question 7

What is a racemic mixture

Answer 7

A mixture which contains equal quantities of enantiomer

Question 8

What’s the reagent and observations for Ba2+

Answer 8

Reagent: H2SO4
Observation: white ppt

Question 9

State the reagent and observation for SO4 2-

Answer 9

Reagent: BaCl2
Observation: white ppt

Question 10

The ionic equation linking BaCl2 and SO4 2-

Answer 10

Ba2+ SO4 2- ————> BaSO4

Question 11

Name the reagent and observation for Mg2+

Answer 11

Reagent: NaOH
Observation: white ppt

Question 12

Name the reagent and observation for OH-

Answer 12

Reagent: MgCl2
Observation: white ppt

Question 13

What the reagent and observation for Cl- Br- and I-

Answer 13

Reagents: NH3 and AgNO3
Observation:
Cl —> white ppt
Br —> cream ppt
I —> yellow ppt

Question 14

What reagent and observation made for AgCl and AgBr

Answer 14

AgCl:
Reagent: dilute ammonia
Observation: ppt dissolves

AgBr:
Reagent: conc ammonia
Observation: ppt dissolves