9. Chemical change:
A substance can completely change into different
substance and a new substance is formed.
Metals and non metals react differently with
oxygen,water,acids,bases,etc and produce new
substances.
10. REACTION of Metals WITH OXYGEN:
different metals combine with oxygen to form metal
oxide
*Metals+oxygen----------->metal oxide ---basic in nature
* 4Na+O2----->2Na2O RED TO BLUE
*2Mg+O2------>2MgO
Non Metals
Non metals +oxygen---->non metallic oxide
C+O2-->CO2
S+O2---->SO2 acidic in nature BLUE TO RED
11. 1. Metal oxide is basic oxide as they form bases when dissolved in
water.
Turn red litmus blue.
1. Non-metallic oxides are called acidic oxide as they form acids
when dissolved in water
Turn blue litmus to red litmus.
CO2+H2O--->H2CO3 Carbonic acid
SO2+H2O------.>H2SO3 Sulphurous acid
