iron becomes rusty a gold bar is melted lake water evaporates a granite rock is polished
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Emily made a chart that included physical changes and chemical changes. Which change should be categorized as a chemical change?
Possibilities:
- iron becomes rusty
- a gold bar is melted
- lake water evaporates
- a granite rock is polished

iron becomes rusty