00:01
So, this chemical reaction first we will understand what is chemical reaction.
00:06
So, chemical reaction is the reaction in which the product is formed with different properties, product is formed with different properties, formed with different properties as compared to the original reactants, as compared to the original reactants.
00:55
These properties are different in chemical reaction and the product has different properties, different composition as compared to the original one.
01:04
So, these are the chemical changes.
01:06
So, also there is changes in composition, in chemical composition, we can say that changes in chemical composition, chemical composition.
01:25
So, here some processes are given and you have to find out whether it is chemical reaction or physical.
01:34
So, first we have burning wood.
01:38
So, burning wood is a chemical reaction, it is a chemical reaction because when the wood is like burnt in fire, so there is the changes in its like the solid state will change to the liquid state and you can say that after the reaction it cannot be reversed to its original one.
02:07
So, it is completely, now it completely forms a new product that has different properties as compared to the original wood and also it cannot be reversed back to the original one.
02:21
So, this one is the example of chemical change.
02:24
Now we have melting ice.
02:29
So, melting ice, when we melt an ice, so that is a physical change, not a chemical change, why? because when we melt the ice, it only converted into the water.
02:43
Ice has also chemical composition, its chemical formula is h2o and water has also chemical formula that is h2o.
02:51
So, when we melt the ice, it only converted into water, there is no change in its chemical composition or no change in its properties.
03:00
So, water and ice has same property, only the state change...