Alloys and their properties：练习题

What is the best description of an alloy?

Why is brass harder and stronger than pure copper?

Stainless steel is an alloy used to make cutlery and surgical instruments because it does not rust.
Which elements are typically mixed with iron to produce stainless steel?

The diagram represents the arrangement of atoms in an alloy.
Which statement correctly explains, in terms of structure, why this arrangement makes the alloy harder than a pure metal?

Explain, in terms of structure, why alloys are harder and stronger than pure metals.

State the two primary elements that compose the alloy brass and identify one physical advantage it has over pure copper.

In a diagram showing the microscopic structure of an alloy, atoms of different sizes are present. Explain how this specific arrangement makes alloys harder than pure metals.

The diagram represents the arrangement of atoms in a sample of pure iron and a sample of stainless steel.
(a) Identify the type of substance represented by stainless steel and name the main element added to iron to create it.
(b) Explain, in terms of their structures, why stainless steel is harder and stronger than pure iron.