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Explain the 3 pieces of evidence that disprove Kekule's model of benzene.

Kekulé's model of benzene is that it has 3 double bonds, in a ring of 6 carbons. One - Benzene isn't very reactive, so if Kekulé's model were to be correct, there would be 3 double bonds in benzene, and so i...
EW
Answered by Ellie W. • Chemistry tutor
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2HCl (aq)+CaCO3 (s)->H20(l)+CaCl2(aq)+CO2(g). If using 40cm^3 of 2.5mol.dm^-3 Hcl and 5.67g of CaCO3, determine the limiting reagent and how much CO2(g) could be theoretically produced by this reaction.

First, we have to convert the starting measurements for the HCl and CaCO3 content into moles so we can compare the ratios to the formula. 40cm^3=0.04dm^30.04dm^3 2.5mol.dm^-3=0.1 moles of HClmass/molar mass=...
DR
Answered by Daniel R. • Chemistry tutor
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How do endothermic and exothermic reactions differ?

Endothermic reactions take in heat from the surroundings, whereas exothermic reactions release heat to the surroundings. Exothermic reactions release heat as the energy released from the bonds being made in ...
ML
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Why is a benzene ring so stable (3 marks)?

The p orbitals on each carbon atom in benzene overlapThere is delocalisation of electrons in the ring (not 3 localised C==C double bonds)This makes benzene more thermodynamically stable than predictedIt ther...
AC
Answered by Aadil C. • Chemistry tutor
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How does pH relate to pKa?

pH measures the concentration of H + (protons) in an aqueous solution. pK a measures the ability for an acid to dissociate in an aquesous solution. Their relationship can be described my the Henderson-hassel...
CW
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