EASY
Upper Secondary: IGCSE
IMPORTANT
Earn 100
Two of the elements in chalcopyrite are the metal, copper, and the non-metal, sulfur. These have different properties. Copper is an excellent conductor of electricity and is malleable. Sulfur is a poor conductor and is non-malleable, it is brittle. Explain, in terms of their structures, why this is so: difference in electrical conductivity.
Important Questions on Cambridge IGCSE Exam Questions from Paper 3
EASY
Upper Secondary: IGCSE
IMPORTANT
Two of the elements in chalcopyrite are the metal, copper, and the non-metal, sulfur. These have different properties. Copper is an excellent conductor of electricity and is malleable. Sulfur is a poor conductor and is non-malleable, it is brittle. Explain, in terms of their structures, why this is so: difference in malleability.
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
There are three types of giant structure - ionic, metallic and macromolecular. Sodium nitride is an ionic compound. Draw a diagram that shows the formula of the compound, the charges on the ions, and the arrangement of the valency electrons around the negative ion. Use x to represent an electron from a sodium atom. Use o to represent an electron from a nitrogen atom.
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
There are three types of giant structure - ionic, metallic and macromolecular. Describe metallic bonding.
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
There are three types of giant structure - ionic, metallic and macromolecular. Use the above ideas to explain why metals are
A: good conductors of electricity,
B: metals are malleable.
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
There are three types of giant structure - ionic, metallic and macromolecular. Silicon oxide has a macromolecular structure. Describe the structure of silicon oxide (a diagram is not acceptable).
EASY
Upper Secondary: IGCSE
IMPORTANT
There are three types of giant structure - ionic, metallic and macromolecular. Silicon oxide has a macromolecular structure. Diamond has a similar structure and consequently similar properties. Give two physical properties common to both diamond and silicon oxide.
EASY
Upper Secondary: IGCSE
IMPORTANT
Calcium carbonate is an important raw material. Name a rock made up of calcium carbonate.
EASY
Upper Secondary: IGCSE
IMPORTANT
Calcium carbonate is an important raw material. When calcium carbonate is heated strongly, it decomposes: . Calculate the relative formula mass of .
