CHEM1 AQA AS DEFINITIONS

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  • Created by: kyle
  • Created on: 09-05-12 15:49

Mass Number (A) - Total number of protons and neutrons in the nucleus of one atom of the element.

Atomic Number (Z) - Number of protons in the nucleus of an atom.

Isotope - Element with same atomic number but with a different number of neutrons.

Ionisation Energy - The enthalpy change to remove 1 mol of electrons from 1 mol of gaseous atoms.

Relative Atomic Mass - Average mass of one atom of an element ÷ one twelfth the mass of one atom of carbon-12.

Relative Molecular Mass - average mass of one molecule ÷ one twelfth the mass of one atom of carbon-12.

Ideal Gas Equation - pV=nRT

Moles Calculation - No. of mols = mass in grams ÷ The Mr of the element/compound.

Titration Calculation - No. of mols = (volume in cm³ ÷ 1000) x the molarity

Empirical Formula - The simplest ratio of atoms of each element in a compound.

Molecular Formula - The actual number of

Comments

HD

Great notes :) the only thing I would add would be 'simplest whole number ratio' for the definition of empirical formula

Kim

HD wrote:

Great notes :) the only thing I would add would be 'simplest whole number ratio' for the definition of empirical formula

trybreathing

Thanks

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