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Chemistry

A Level

What is enthalpy?

Enthalpy (given the symbol H) is a measure of how much heat energy can be released by a chemical. ΔH is defined as the amount of heat energy released or taken in when two chemicals rea...

Answered by Chris M. • Chemistry tutor

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What are the different types of bonding in chemicals?

There are 2 types of bonding in chemicals; ionic bonding and covalent bonding. Both of these aim to fill the outer shells of the atoms. You can also have bonds between molecules called intramolecular b...

Answered by Chris M. • Chemistry tutor

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What is an isotope?

Isotopes are different forms of the same element by mass. While an atom is classified as a particular element based on the number of ...

Answered by Chris M. • Chemistry tutor

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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

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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

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