- Metals are generally hard and are found as solid at room temperature.
- Metals have metallic luster, ductility, malleability and sonority.
- Metals are good conductors of heat and electricity.
- Non-metals are found in all the three states of matter at room temperature.
- Non-metals are bad conductors of heat and electricity.
- Most of the metals combine with oxygen to form oxides.
- The process to form a thick layer of aluminium oxide is called annodising.
- Metal reacts with water to form oxides.
- Metals react with acid to form salt and hydrogen gas.
- When a more reactive metal reacts with salt of a less reactive metal, it displaces the less reactive metal to form its own salt.
- A compound formed by transfer of electrons from one element to another is called ionic compound.
- Oxides of metals at the bottom of reactivity series are heated to obtain pure metal. Sulphides of these ores are first heated to obtain oxides. After that, oxide is heated to obtain the pure metal.
- Sulphide ore is subjected to roasting to obtain oxide.
- Carbonate ore is subjected to calcinations to obtain oxide.
- Metals at the top of the reactivity series are obtained by electrolytic reduction of their oxides.
- The brown layer of iron oxide deposited on iron articles is called rust. The process of formation of rust is called rusting.
These main points are highly helpful for last minute preparation for examination. You can glance through them while going for examination. You can view them in the school bus, in car, in elevator, etc.