Chemistry 0620 · IGCSE · Giant covalent structures

Giant covalent structures — practice question

Carbon and silicon are elements in Group IV of the Periodic Table, and each occurs in more than one isotope.
(a)[2]

Define what is meant by the term isotopes.

(b)[3]

Complete the table that shows information about carbon atoms and silicon atoms.

(c(i))[1]

Name the type of bond that is found between silicon atoms in silicon.

(c(ii))[4]

Suggest two physical properties of silicon, and explain them using your knowledge of structure and bonding.

(d(i))[2]

Explain how this carbon monoxide comes to be formed.

(d(ii))[1]

State why carbon monoxide should not be breathed in.

(e(i))[2]

Name the type of structure that each of the following compounds has: carbon dioxide; silicon(IV) oxide.

(e(ii))[3]

Use your understanding of structure and bonding to explain why carbon dioxide is a gas at room temperature and pressure, whereas silicon(IV) oxide is a solid.

(f)[2]

Write a chemical equation for the reaction of silicon(IV) oxide with aqueous sodium hydroxide.

Worked solution & mark scheme

This 20-mark question has a full step-by-step worked solution and mark scheme. One marking point: Atoms belonging to the same element / sharing the same proton (atomic) number

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