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How should I approach answering moles calculation questions?

The key to answering any moles calculation question in chemistry is working out which equation you need to use. Generally, if moles are involved it will be moles = volume x concentration or moles = mass/RFM....
JS
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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 benz...
IP
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) = -3...
AP
Answered by Afia P. • Chemistry tutor
28130 Views

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 Metallic bondin...
Answered by • Chemistry tutor
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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:H 2 : 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. O 2 : Glowing Splint Test: Add a still glowing splint to a small...
DS
Answered by Daniel S. • Chemistry tutor
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