Metals

Topics: Oxygen, Iron, Carbon dioxide Pages: 4 (801 words) Published: August 4, 2013
Metals
Physical Properties of Metals versus Non-metals
Properties| Electrical conductivity| Heat conductivity| Melting and Boiling points| Malleability & ductility| Lustre| Metals| Good| Good| High| High| Shiny|
Non-metals| Poor| Poor| Low| Low (Brittle)| Dull|

Chemical Properties of Metals versus Non-Metals
Properties| Metals| Non- metals|
Reaction with oxygen| Form basic or amphoteric oxides| Form acidic or neutral oxides| Ionisation| Lose electrons to form positively charged ions| Gain electrons to form negatively charged ions|

Why are Alloys stronger & harder than pure metals?
* Different sizes of atoms
* Disruption in the orderly arrangement of atoms
* Layers of atoms cannot slide over each other easily

Reactivity of Metals
Metals| Reaction with oxygen| Reaction with water| Reaction with steam| Reaction with dilute acid| Reduction of oxides by carbon / carbon monoxide| Reduction of oxides by hydrogen| K| Forms oxides and peroxides| Violent, metal darts on surface of water, hissing sound, sparks formed; Metal hydroxide and hydrogen gas formed.| Very Violent reaction| Very Violent| No reaction (Metals are very reactive and form very stable oxides; A lot of energy is required to overcome the strong electrostatic forces of attraction between the ions)| No reaction (Metals are very reactive and form very stable oxides; A lot of energy is required to overcome the strong electrostatic forces of attraction between the ions)| Na| | | | | | |

Ca| Forms oxides| Metal sinks in water, effervescence seen;Metal hydroxide and hydrogen gas formed.| Violent reaction| Reacts violently to form salt and hydrogen gas| | | Mg| | Very slow reaction, few bubbles on surface of solid; Metal hydroxide and hydrogen gas formed.| Fast reaction, forming oxide and hydrogen gas| Reacts fast to form salt and hydrogen gas| | | Al| | No reaction with water| No reaction due to oxide...
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