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Worksheets4.2a Metals & Metallic Alloys L1 Retrieval
Total questions: 10
Worksheet time: 5mins
What is ore?
Rock found in the earths crust
Rock that contains metal that can be economically extracted
Rock that is found deep in the earth's mantle
Rock that contains minerals
The two different ways of extracting metal form ore are _____&_____
(a)
Why might electrolysis be used instead of smelting?
Electrolysis is faster than smelting
Electrolysis is most inexpensive
Electrolysis is used on highly reactive metals that form strong bonds within the ore.
Electrolysis is used on low reactive metals that form weak bonds within the ore
The rate at which a metal cools can affect the grain size. True or false, a quickly cooled metal increases brittleness while decreasing tensile strength, toughness and ductility
True
False
Work hardening increases the hardness of a metal. What property does work hardening also increase?
Malleability
Toughness
Brittleness
Ductility
What is the purpose of annealing metal and when does metal need to be annealed?
Annealing is used to remove dents after work hardening
Annealing is used to toughen the metal after work hardening
Annealing is used to soften the metal after work hardening
Annealing is used to harden the metal after tempering
Why are metals not useful in their pure form and need to be alloyed?
Most metals are too soft and brittle
Most metals are too tough and brittle
Most metals are too hard and difficult to shape
Most metals are too expensive
True or false, annealing regrows a new grain structure (recystallisation) which allows it to be further work hardened.
True
False
True or false, metal cannot be recycled indefinitely because it degrades in quality
True
False
Recycled aluminium uses _____ less energy than mining and processing bauxite.
65%
75%
85%
95%
