Summary
Metals have distinct physical and chemical properties, including being shiny, dense, malleable, and excellent conductors of heat and electricity. They form positive ions and react with acids to produce hydrogen gas and a salt.
- Malleable and Ductile — metals can be shaped or stretched without breaking Example: Copper wires
- High Melting and Boiling Points — metals require high temperatures to change state Example: Iron melting at 1538°C
- Conductivity — metals allow heat and electricity to pass through them Example: Aluminum used in electrical cables
- Metallic Bonding — a lattice of positive ions in a sea of delocalized electrons Example: Explains why metals are malleable and conductive
- Alloys — mixtures of metals with other elements to improve properties Example: Brass is an alloy of copper and zinc
- Reactivity Series — ranks metals by their reactivity Example: Potassium is more reactive than gold
- Displacement Reactions — a more reactive metal displaces a less reactive one from a compound Example: Magnesium displacing copper from copper sulfate
- Extraction of Metals — methods depend on reactivity Example: Iron is extracted using carbon reduction
Exam Tips
Key Definitions to Remember
- Malleable and Ductile
- High Melting and Boiling Points
- Conductivity
- Metallic Bonding
- Alloys
- Reactivity Series
- Displacement Reactions
- Extraction of Metals
Common Confusions
- Confusing malleability with brittleness
- Misunderstanding the role of delocalized electrons in conductivity
- Mixing up alloys with compounds
Typical Exam Questions
- What is an alloy? A mixture of a metal with other elements.
- Why are metals good conductors of electricity? Due to the presence of delocalized electrons.
- How does the reactivity series affect metal extraction? Metals less reactive than carbon can be extracted by reduction with carbon.
What Examiners Usually Test
- Understanding of physical and chemical properties of metals
- Ability to explain metallic bonding
- Knowledge of the reactivity series and its implications
- Application of concepts in displacement reactions and metal extraction