Metals And Nonmetals Flashcards
Corrosion
Iron ferric oxide brought.
Copper green copper carbonate basic
Aluminium oxide
Silver reacts with sulphur
2Ag + H2S will give ag2s + h2
Prevention of corrosion
- Painting
Oiling .
Galvanisation
Zinc layer protection, zinc contues to protect because zinc oxide is formed
Ally’s
Homogeneous mixture of metals and non metals
Melting the main and adding
Iron and carbon which makes it hard and string
Resistivity is more and low melting point
Minerals ore gangue
Homogeneous elements which occur naturally
Minerals metals extraction
Earthly impurities
Why oxides ores
Oxygen in reactive and abundant
Free metals ,a moderately reactive
At,au,pt
Zn pb fe, oxides sulphites and carbonate
Highly reactive, k,na,ca,mg,al
Never free
Enrichment
Removal
Reduction
Metals from oxides
Low reactivity mercury
Roasting heating in presence of oxygen cause sulphites
HgS + 02. Hgo so2
Ion formation steps
- Metal valency
- Ionisation rhs for metals lhs for non metals
- Transfer
4 bracket
Ionic compounds property vs covalent computer
Ionic
Non metal metal
High melting and boiling points
Good conductor of electricity
Strong inter molecular bonds
Soluble in water and insoluble in kerosene petroleum
Covalent
2 non metals
No conduction
low melting and boiling
Insoluble in water and soluble in organic solvents
Diamond structure
Lustrous
Colourless
Tranceparenr
4 covalent bonds
No free bonds
Graphite structure
High melting point and good conductor
Layers of Har on
3 bonds one is double bond
Hexagonal
Sheets
C60
Fullerene
Why graphite for lead
Slippery
Brittle
