Search our library of Chemistry A Level questions

Top answers

Chemistry

A Level

Explain the trend in Ionisation energy when moving across a period and down a group

Key definitions/explanation of terms

Ionisation energy is the energy required to remove one mole of electrons from

Answered by Olivia F. • Chemistry tutor

13477 Views

Explain why the second ionisation energy of boron is higher than the first ionisation energy of boron?

Boron is the 5th element in the periodic table, and has an electron configuration 1s²2s²2p¹. The first ionization energy of Boron is the energy required to remove the sing...

Answered by Henry P. • Chemistry tutor

12351 Views

What's the difference between an electrophile and a nucleophile?

It's really useful to know that 'phile' means love.Electrophiles 'love' negative charge - this means they are attracted to regions of negative charge. And as such they tend to be positively charged.Simila...

Answered by Henry P. • Chemistry tutor

6250 Views

What are isotopes and how do they differ from each other?

An isotope is a different form of the same element. They differ from each other by the number of neutrons, however they have the same number of protons and electrons. This results in a different atomic...

Answered by Hayden T. • Chemistry tutor

31473 Views