Скачать или смотреть Extraction of Zinc Cambridge IGCSE O level Chemistry 0620 0971 5070 Lesson 57 part c

10 Metals
10.1 Properties of metals
Core
•• List the general physical properties of metals
•• Describe the general chemical properties of
metals, e.g. reaction with dilute acids and
reaction with oxygen
•• Explain in terms of their properties why alloys are
used instead of pure metals
•• Identify representations of alloys from diagrams
of structure
10.2 Reactivity series
Core
•• Place in order of reactivity: potassium, sodium,
calcium, magnesium, zinc, iron, (hydrogen) and
copper, by reference to the reactions, if any, of
the metals with:
–– water or steam
–– dilute hydrochloric acid
and the reduction of their oxides with carbon
•• Deduce an order of reactivity from a given set of
experimental results
Supplement
•• Describe the reactivity series as related to the
tendency of a metal to form its positive ion,
illustrated by its reaction, if any, with:
–– the aqueous ions
–– the oxides
of the other listed metals
•• Describe and explain the action of heat on the
hydroxides, carbonates and nitrates of the listed
metals
•• Account for the apparent unreactivity of
aluminium in terms of the oxide layer which
adheres to the metal
10.3 Extraction of metals
Core
•• Describe the ease in obtaining metals from their
ores by relating the elements to the reactivity
series
•• Describe and state the essential reactions in the
extraction of iron from hematite
•• Describe the conversion of iron into steel using
basic oxides and oxygen
•• Know that aluminium is extracted from the ore
bauxite by electrolysis
•• Discuss the advantages and disadvantages
of recycling metals, limited to iron/steel and
aluminium
Supplement
•• Describe in outline, the extraction of zinc from
zinc blende
•• Describe in outline, the extraction of aluminium
from bauxite including the role of cryolite and
the reactions at the electrodes
10.4 Uses of metals
Core
•• Name the uses of aluminium:
–– in the manufacture of aircraft because of its
strength and low density
–– in food containers because of its resistance
to corrosion
•• Name the uses of copper related to its properties
(electrical wiring and in cooking utensils)
•• Name the uses of mild steel (car bodies and
machinery) and stainless steel (chemical plant
and cutlery)
Supplement
•• Explain the uses of zinc for galvanising and for
making brass
•• Describe the idea of changing the properties of
iron by the controlled use of additives to form
steel alloys
Below is the link for IGCSE/O level Chemistry Notes/Exercises and Assignments
https://drive.google.com/drive/folder...