Search our library of Chemistry A Level questions

Top answers

Chemistry

A Level

What is the trend in ionization energy across period 3 in the periodic table?

Ionization energy generally increases across period 3 because the nuclear charge increases but the shielding of the outer electrons remains relatively the same. This means that the electrostatic force of ...

Answered by Tamara A. • Chemistry tutor

126436 Views

Why do branch chained isomers have lower boiling point than straight chain equivalents?

As branching increases the boiling point decreases because there are fewer points of contact. This also means van der Waals forces are weaker in branch chained isomers and thus less energy is required to ...

Answered by Kishen L. • Chemistry tutor

29034 Views

What happens to a primary secondary and tertiary alcohol when an excess solution of Potassium Dichromate is added under acidic conditions, state the chemical formula of potassium dichromate?

pottasium dichromate (K₂SO₄) is an example of an oxidising reagent. If added to a primary alcohol, under reflux, carboxcylic acid will form, a secondray alcohol will form a ketone an...

Answered by Christian S. • Chemistry tutor

5314 Views

i) Write a full balanced equation for (a) the complete combustion of glucose and (b) the incomplete combustion of glucose. ii) Following from part i) suggest a reason (and explain) the difference with the product in reaction (a) and that of reaction (b).

Part I (4 marks) a) C₆H₁₂O₆+ 6O₂-> 6CO₂+ 6H₂O b) C₆H₁₂O₆+ 3O₂ -> 6C...

Answered by Lavan G. • Chemistry tutor

9629 Views

The boiling points of ammonia (NH3), fluorine (F2) and bromine (Br2) are -33, -188 and +59 degrees celsius respectively. Explain the differences in these boiling points, including the names of any relevant forces and particles.

Differences in boiling points between molecules are due to varying strength of intermolecular forces. From the data given, we know Br₂ must have the strongest intermolecular forces as it has th...

Answered by Alex H. • Chemistry tutor

68431 Views