Pure metals and alloys

A metal is hit with a hammer. If it dents and changes shape easily it is..

• Malleable

• Hard

• Ductile

• Brittle

Why do jewelers not create jewelry with pure gold, silver, or copper?

• It is too hard to shape into a design

• Pure metals do not stay shiny

• It is impossible to find a pure form of these metals.

• Pure metals are soft, so it will rub or scratch away over time.

Which of the following is NOT usually a property of a metal?

• Shiny when cut

• Good electrical conductor

• Thermal insulator

• Malleable

• High melting point

Which statement about the uses of metals is correct?

• Aluminium is used in the manufacture of aircraft as it has a high density.

• Aluminium is used to make food containers as it conducts electricity.

• Stainless steel for cutlery is made by adding other elements to iron.

• Stainless steel is used to make chemical reactors as it corrodes readily.

Pure metals conduct electricity and can be hammered into different shapes. Why are metals sometimes used as alloys?

• Alloys are cheaper than the metals they are made from.

• Alloys are easier to hammer into different shapes.

• Alloys are harder and keep their shape better.

• Alloys conduct electricity better.

If a material can easily be drawn into the shape of a wire, it is

• Ductile
• Magnetic
• Malleable
• Reactive

Pure iron is _________________ .

• soft and weak

• hard and stong

• bendy and brittle

An alloy always contains...

• A mixture of types of atom, at least one of which is a metal

• A mixture of types of atom, all of which must be metals

• just one type of atom, arranged in neat rows

• two or more types of atom, chemically bonded together

Atoms in metals are arranged in layers that can slide over each other. This makes them...

• dense

• conductive

• easy to bend and shape

• shiny

In steel, iron is mixed with small amounts of non-metal, _______ .

• Copper

• Carbon

• Diamonds

• Wood