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Describe the structure of silicon dioxide

A giant macromolecular covalent structure with a high melting point and covalent intramolecular bonds between all atoms.

Answered by Rohan K. • Chemistry tutor

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Explain trend in why the ionisation energies increase across the period

Use the following data to explain why NaCl is soluble in water: ∆H = +31 kJmol-1, S(Na+(aq)) = 320.9 JK-1mol-1, S(Cl-(aq)) = 56.5 JK-1mol-1, S(NaCl(s)) = 72.1 JK-1mol-1 Are there any temperatures at which you would not expect NaCl to dissolve?

Describe how to perform a flame test to identify an unknown compound.

Describe the enthalpy change of formation of butane.

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