7. Metals Flashcards
Basic characteristics of metals
There are reactive metals, less reactive metals, the structural metals and coinage metals.
Physical properties: Good conductors, low densities, grey shiny surfaces
Chemical properties: Very reactive, form ionic compounds with non-metals
What are combustion reactions
Combustion is the process when reactions deals with oxygen. Metals react readily with oxygen to form oxide.
What happens when metals react with acids?
Metals also react with acids, produce salt and hydrogen gas.
What is the product when metals react with water?
They produce hydroxides and hydrogen gas
amphoteric characteristics of aluminum oxide
- It has crystalline form
- It is an electrical insulator , and hard
- Insoluble in water
- It reacts with basic ex. NaOH and acidic ex. HCl solutions forming salt, it is neutralizing reactions
- It acts as catalyst in Claus process
amphoteric characteristics of aluminum hydroxide
- it is white amorphous powder
- it can act as either acid or base, can act as Bronsted-lowry bas (accepting proton), or Lewis acid (accepting electron pair), depending on the reaction
- Al(OH)3 is largely insoluble in water
- In acidic solution is goes neutralization reaction ex. HCl produce water and salt AlCl3
- It react also with basic solution where Al(OH)3 picks up one hydrogen ion to form Al(OH)4-.
comparison of chemical activity of various metals (basic)
- All metals have tendency to lose electrons and form metal ions.
- They are reducing agents and can oxidize themselves.
There are reactive metals, the less reactive metals, the structural metals and coinage metals. Ionization energy decrease down the group, the larger the ionization energy the more reactive the metal is. It forms ionic bonds with non-metals
High reactive metal + water = ?
oxides soluble in water
Medium reactive metal + water =?
less soluble oxides
Low reactive metal + water =?
insoluble oxides
