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why does silicon dioxide have such a high melting/boiling point?

It has a giant lattice structure, strong covalent bonds are difficult to break etc.

Answered by Kian D. • Chemistry tutor

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The recommended daily allowance of methionine for an adult is 15 mg per kg of body mass. Tuna contains 755 mg of methionine per 100 g portion. Calculate the mass, in grams, of tuna that would provide the RDA of methionine for a 60 kg adult.

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What is a formula of Potassium Sulfate?

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3.786g of hydrated zinc sulphate, ZnSO4•xH2O, is heated to remove all water of crystallisation. The mass of anhydrous ZnSO4 formed is 2.122g. What is the formula of the hydrated zinc sulphate?

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