Lesson 3 - Classification and Properties SAQ
This lesson allows you to test yourself on the material covered in the lesson on Classification and Properties and determine the level to which you have met the learning outcomes.
Suggested Response - Q2
*Indicate whether the following statements are true or false. Provide a reason if they are false.
a) Metals are characterised by a crystal lattice structure of negative metallic ions.
b) Iron is an alloy.
c) Aluminium is a ferrous metal.
d) Steel is a noble metal.
e) Tension refers to a material under a pulling force.
f) Glass is a crystalline ceramic.
g) Stick welding is suitable for fixing a leak on your beer mains.
h) Copper is widely used as the metal of choice for modern brewing.
i) Thermosets make excellent gaskets.
Response:
a) False. Metals are characterised by a crystal lattice structure of positive metallic ions.
b) False. Iron is a pure metal. Steel is an alloy.
c) False. Aluminium is a non-ferrous metal.
d) False. Steel is an alloy. Steel also contains iron and iron exists as iron oxide in its base form.
e) True.
f) False. Glass is a non-crystalline ceramic.
g) False. Stick welding is not suitable for welding stainless steel and especially poorly suited to hygienic applications.
h) False. Copper has been replaced by stainless steel as the metal of choice for modern brewing.
i) False. Thermosets are hard and thus are not suitable for use as gaskets.