Which of the following is/are chemical changes? Select all that apply. 1. water boiling

2. vinegar and baking soda mixing and creating bubbles

3. dumping baking soda into water

4. a bike rusting while it sits outside

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!