Do You Know?
1. We say water is a molecule. But isn't it also a compound because hydrogen and oxygen have been chemically combined?  If so, how do you determine whether a substance is a compound or a molecule?
2. Does the size of a magnet make it stronger?
3. How many atoms are there in the world?
4. How does baking soda help in cooking chickpeas (chana / kondaikadalai)?