Physical or Chemical Change

Question

1. Calcium chloride + water
2. Sodium hydrogen carbonate + Hydrochloric acid

I think # 2 is chemical change because carbon dioxide and water are form. Is that correct?

But for #1 reaction, it produces heat, but if the water evaporated, still the same substance? So it this a physical or chemical change?

Thank you!

Answer 1

Yes, #2 is a CHEMICAL change.

For #1, it is somewhat of an unfair question. Many consider it a chemical change because heat is absorbed, but others consider it a physical change because there is no change in the chemical nature of the calcium chloride, and as you point out, removing the water results in the original calcium chloride. Either answer is considered correct.