[C10] Metals

Question 1

What are the general physical properties of metal?

Answer 1

• high melting and boiling point.
• Malleable
• Ductile
• Good conductor of heat and electricity

Question 2

What is an alloy

Answer 2

Mixtures of a metal with other elements

Question 3

Why are alloys used instead of pure metals

Answer 3

Other elements in the structure can change the properties of the alloy and make the alloy stronger than the parent metal.

Question 4

What is a metallic bonding

Answer 4

Lattice of positive ions in a ‘sea of electrons.’

Question 5

Place in order the reactivity series

Answer 5

Potassium
Sodium
Calcium
Magnesium
Aluminium
(Carbon)
Zinc
Iron
(Hydrogen)
Copper

Question 6

Use of aluminium

Answer 6

-In aircraft parts because of it strengths and low density
-In food containers because of its resistance

Question 7

General equation of reactivity of metal with water

Answer 7

Metal + water —> metal hydroxide + hydrogen

Question 8

General equation of reactivity of metal with acid

Answer 8

Metal + acid —> salt + hydrogen
(Unreactive metal e.g. gold, copper do not react)

Question 9

General equation of reactivity of metal with oxygen

Answer 9

Metal + oxygen —> metal oxide

Question 10

Name three different types of steel and what they are alloyed with

Answer 10

1. Stainless steel (20% Chromium and 10% Nickel)
2. Tungsten steel (5% tungsten)
3. Manganese steel (13% Manganese)