Read the given situation and answer the following question:
Riya poured water into a kettle and heated it on the stove. After some time, bubbles appeared and steam started coming out from the spout. She observed that the water level inside the kettle slowly reduced. Riya wanted to know whether this change was physical or chemical.
1. What happened to the water when it was heated?
2. What state did the water change into?
3. Is this a physical change or a chemical change?
4. Why is no new substance formed here?
5. What evidence shows that this is a change in state?