Chemistry Ions (alevel, Ocr A)

proton – a stable particle with positive charge equal to the negative charge of an electron
Pauli Exclusion Principle – No more than 2 electrons may occupy an orbital and they must have opposite spin.
products – The compounds that are formed when a reaction goes to completion
How many electrons can an orbital house? – 1-2
law of conservation of mass – States that matter can be neither destroyed nor created during ordinary chemical reactions or physical changes
What is the hydrosphere? – The part of the Earth mostly made up of water and certain dissolved compounds.
Which of the following processes is endothermic?
put the intermolecular forces in order of reactivity (starting with the least reactive) – (weakest) london dispersion forces, permanent dipole to permanent dipole interactions and hydrogen bonding (strongest)
Reduction – the gain of electrons
Which оf the fоllоwing processes is endothermic?
a compound is ____atoms bonded together – different
Robert Millikan – American Scientist – determined the relative charge and mass of an electron
Enthalpy Changes (Dissolving, displacement and neutralisation reactions) –
How do you write the formula for an ionic compound? – Find the charge for each element on the periodic table and criss cross.

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