EASY
Upper Secondary: IGCSE
IMPORTANT
Earn 100
Iron is extracted in a blast furnace. The list below gives some of the substances used or formed in the extraction. Carbon monoxide, coke, iron ore, limestone, slag.
(ii) Which substance is formed when impurities in the ore react with calcium oxide?
Important Questions on Cambridge IGCSE Exam Questions from Paper 3
EASY
Upper Secondary: IGCSE
IMPORTANT
Iron is extracted in a blast furnace. The list below gives some substances used or formed in the extraction. Carbon monoxide, coke, iron ore, limestone, slag.
(iii) Which substance is also called hematite?
EASY
Upper Secondary: IGCSE
IMPORTANT
State two functions of the coke used in the blast furnace.
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Most of the iron is converted into mild steel or stainless steel. Give one use for each.
EASY
Upper Secondary: IGCSE
IMPORTANT
The first three elements in Group IV are carbon, silicon, germanium. The element germanium has a diamond-type structure. Describe the structure of germanium. A diagram is acceptable.
EASY
Upper Secondary: IGCSE
IMPORTANT
The first three elements in Group IV are carbon, silicon, germanium. Unlike diamond, graphite is soft and is a good conductor of electricity.
(i) Explain why graphite has these properties.
EASY
Upper Secondary: IGCSE
IMPORTANT
Unlike diamond, graphite is soft and is a good conductor of electricity. Give a use of graphite that depends on one of these properties.
EASY
Upper Secondary: IGCSE
IMPORTANT
Carbon dioxide and silicon(IV) oxide have similar formulae but different types of structure. (i) Give the formulae of these oxides.
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Carbon dioxide and silicon(IV) oxide have similar formulae but different types of structure. (ii) How are their structures different?
