Explanation:

Toasting bread is a chemical change because, there is a change of colour, a new substance is formed and it is irreversible. You can't "untoast" toast ! An example ofchemical change is toasting bread because, the bread's sugars and proteins are altered. Chemical changes result in the formation of new substances, and the changes that occur cannot be reversed (at least without other chemical changes). The heat from frying an egg causes the egg's protein to change permanently in texture and in appearance through a process called denaturing.so prapring lemonade and sublimation of ice is not a chemical change.