Question

Which of the following is an example of a chemical change?

water boiling to produce a gas

baking soda and vinegar combining to form a gas and a solid

grinding cinnamon and sugar together

adding hot water to freeze-dried coffee

Answer 1

Hello)
I think that baking soda and vinegar combining to form a gas and a solid

Answer 2

I'd say B, because A is only undergoing a physical change, C is just getting grinded, so nothing is going on chemically, and D is just adding some water to coffee. This might be wrong, so sorry if it is!