<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  Provide an example of a chemical reaction. Context: A chemical reaction is the process by which two or more substances combine to form a new substance with different properties. Answer: [/INST]It is the process by which two or more substances combine to form a new substance with different properties.</s>