Giant Structures (C2.6-2.7)

What are giant covalent structures?

• Gaseous elements with no structure

• Liquid compounds with ionic bonds

• Macromolecules with strong covalent bonds

• Small molecules with weak bonds

What are allotropes?

• Compounds with the same formula

• Different structural forms of the same element

• Mixtures of metals and non-metals

• Different elements in the same group

Why does diamond not conduct electricity?

• It has a liquid structure

• All outer shell electrons are in covalent bonds

• It is a metal

• It has free electrons

What is the structure of graphite?

• Tetrahedral structure with strong bonds

• Random arrangement of carbon atoms

• Hexagonal layers with delocalised electrons

• Linear chains of carbon atoms

What is silicon(IV) oxide commonly known as?

• Silicon tetrachloride

• Silicon dioxide

• Silica

• Silicon carbide

What type of bonding is present in silicon(IV) oxide?

• Hydrogen bonding

• Metallic bonding

• Covalent bonding

• Ionic bonding

What allows metals to be malleable and ductile?

• Layers of positive ions sliding over each other

• Weak intermolecular forces

• Strong ionic bonds

• Rigid structures with no movement

What is metallic bonding?

• Attraction between positive ions and delocalised electrons

• Attraction between negative ions and electrons

• Weak forces between metal atoms

• Covalent bonds between metal atoms

Why do metals have high melting and boiling points?

• They have weak bonds

• They are composed of gases

• They have low density

• They contain many strong metallic bonds

What is another name for silicon(IV) oxide?

• Silicon nitride

• Silicon dioxide

• Silicon sulfide

• Silicon phosphate