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What is the evidence that disproves the Kekule model for benzene?

The enthalpy change of hydrogenation of benzene was shown to be less exothermic than 3 times that of hexene, therefore meaning that benzene does not contain three double bonds. X-ray imaging showed that b...

Answered by Ioana P. • Chemistry tutor

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Why is benzene more stable than the theoretical model cyclohexa-1,3,5-triene?

In cyclohexa-1,3,5-triene the molecule has 3 single bonds and 3 double bonds where all the electrons are localised. As a result the energy needed to hydrogenate cyclohexa-1,3,5-triene is (3x -120kJ/mol) =...

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What are the 3 main types of chemical bonding? Give definitions of them.

IonicCovalentMetallic
Ionic bonding The electrostatic attraction between positive and negative ions
Covalent bonding Electrostatic attraction between a shared pair of electrons and the nuclei <...

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List simple experimental tests to determine if either Hydrogen, Oxygen, Chlorine or Carbon Dioxide gas was produced in a reaction. State conditions and expected positive results for each

Presence of:H₂: Squeaky Pop Test: use a lit split to light a small sample of gas in a test tube. If Hydrogen, then a Squeaky pop will occur. O₂: Glowing Splint Test: Add a still glow...

Answered by Daniel S. • Chemistry tutor

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i)Give the Correct full electronic configuration for the Mg2+ ion, ii) and state why it is easier to form the 2+ state for Mg than Ben

Mg electronic configuration - [Ne] 3s2, 2+ charge - 2 Electrons removed, Mg2+ configuration - [Ne] - 1s2 2s2 2p6
Be is directly above Mg in the periodic table, meaning Be has its valence electrons in...

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