Natalie, a great question. Before answering it I thought that we needed to think about what was meant by the term ‘Chemical’. So I asked my team.
So the salt that you put on your food is a chemical. The food is made up of chemicals. Water is a chemical and so is Oxygen, the gas that you breathe. Washing up liquid is made of chemicals as is milk and butter.
Sometimes, very, very rarely adding one chemical to another causes an explosion. So there is no need to worry. Please ask another question.