错题

Question 1

Why is major organic product more stable than minor

Answer 1

It has a greater number of alkyl group bonded to the C showing largest inductive effect.

Question 2

why does N2 not behave as an ideal gas at very high pressure

Answer 2

Particles are forced to be together therefore increased intermolecular force. Molecule’s volume will no longer be negligible

Question 3

Why does lithium sulfide have a high melting point( explain in terms of the structure)

Answer 3

It has a giant structure which there will be many strong ionic bonds

Question 4

A sample of BaBr2 is dissolved in water. Chlorine gas is then bubbled into the solution .
Describe the observations for this reaction:

Answer 4

Solution will turn from colorless to brown due to bromine.

Question 5

Predict the effect of using 2-chloro-2-methylpropane compared to 2-bromo-2-methylpropane on the time taken for the pink colour to disappear. Explain your answer

Answer 5

• Chlorine is a bad leaving group as it has a smaller atomic radius than bromine. This means that chlorine has a higher electron density which makes it a stronger base than bromine as it will attract protons easier. This will cause the pink color to take longer to disappear

Question 6

Name two physical property typical of ceramic materials

Answer 6

Strong
High melting points

Question 7

SiCl4 + H2O
Observations:

Answer 7

SiCl₄ + 2H₂O → SiO₂ + 4HCl
Misty fumes + white solid (SiO₂)

Question 8

Which two group 2 compounds can produce gas when heated and what gases are produced

Answer 8

Metal Carbonates - CO2
Metal Nitrates - NO2 + O2

Question 9

Difference between elimination and oxidation reaction

Answer 9

Elimination removes an hydrogen AND a group (e.g. OH)
Oxidation only removes hydrogen from the compound

Question 10

In nucleophilic substitution, does bromoalkane react faster or iodoalkane

Answer 10

Iodoalkane as it has a longer bond length therefore the bond is very weak, so faster reaction will happen.