Metallic bonding and alloysIB MYP Chemistry: Mind map

Exam questions on Metallic bonding and alloys

1. An electrician in Johannesburg chooses copper for the electrical cables in a new school building because copper conducts electricity very well. Copper is a metal.
   Describe the structure of a metal such as copper.2 marks
2. A craftsperson in Marrakech hammers a flat sheet of copper into a bowl. The copper changes shape without cracking or breaking.
   Explain why the copper changes shape without breaking.2 marks
3. A student compares the hardness of pure copper with brass, an alloy of copper and zinc. She drops the same steel ball bearing from the same height onto a strip of each metal and measures the diameter of the dent. She does three trials on each strip. The dents in copper measured 3.5 mm, 3.4 mm and 3.3 mm. The dents in brass measured 2.2 mm, 2.0 mm and 2.1 mm.
   Calculate the mean dent diameter for each metal and state which metal is harder, giving a reason.3 marks