Top answers

Chemistry
A Level

What is the definition of 'first ionisation energy'?

The first ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms from its valence shell.

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Answered by Shreyas B. Chemistry tutor
19848 Views

Describe, with the aid of diagrams, what hydrogen bonding is in water.

Hydrogen bonding is a strong dipole-dipole attraction between a lone pair of electrons on a highly electronegative atom, such as oxygen or nitrogen, and a hydrogen atom on another molecule. In the case of...

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Answered by Anna H. Chemistry tutor
8232 Views

Construct expressions for pH, Kw and Gibbs Free energy

pH=-log[H+] Kw=[H+][OH-] GFE=enthalpy-(temp*entropy)

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Answered by Joe D. Chemistry tutor
4090 Views

Why can endothermic reactions occur spontaneously if the entropy change is negative for a cooling process?

An endothermic process is one which cools as the reaction proceeds meaning that the entropy change of the reaction will be negative. These reactions may still be feasible as the spontaneous nature of a re...

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Answered by Eve R. Chemistry tutor
14987 Views

A sample of hydrochloric acid has a pH of 2.34. 
Write an expression for pH and calculate the concentration of this acid.

pH = -log([H+])

Therefore, 10^(-pH) = [H+]

[H+] = 4.57x10^-3

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Answered by Charlie N. Chemistry tutor
10287 Views

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