Metallic bonding (AQA GCSE Chemistry Combined Science): Flashcards
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What is metallic bonding?
What is metallic bonding?
Attraction between positive metal ions & delocalised electrons
Delocalised electrons meaning
Delocalised electrons meaning
Outer electrons that move freely around the structure
Lattice in metallic bonding
Lattice in metallic bonding
Regular pattern of positive metal ions
Sea of electrons
Sea of electrons
Freely moving delocalised electrons in metals
What holds metallic bonds together?
What holds metallic bonds together?
Electrical attraction between positive ions & negative electrons
Why are alloys made?
Why are alloys made?
Pure metals too soft, alloys harder & more useful
Definition of alloys
Definition of alloys
Mixtures of different metals
Why alloys harder than pure metals
Why alloys harder than pure metals
Different sized atoms disrupt pattern, layers can't slide easily
Why metals conduct electricity
Why metals conduct electricity
Delocalised electrons move freely through structure
Solder composition
Solder composition
Alloy of tin and lead
Solder melting point
Solder melting point
183°C (low temperature)
Copper melting point
Copper melting point
1085°C (high)
Why copper used for cooking pans
Why copper used for cooking pans
High melting point & conducts heat well
Sodium melting point
Sodium melting point
98°C
Why Na & Mg not used for cooking pans
Why Na & Mg not used for cooking pans
Low melting points, would melt & be dangerous