Preparation of Ether
Here are the reactions involving the preparation of ethers
Yes it is a chemical change as it involves the formation of ash and releases heat. Which can not be reversed to get fuel. In a chemical change the change of properties take place . For example we can write on paper and can fold it ,but if we burn it we get ash and
Density depends upon the number of particles in a unit area. So it doesn’t matter what kind of particles are used. So it is a physical property.
No, dissolving is a physical process, provided that the substances which are being mixed should not react with each other.