Question

Which of these is a chemical change?

OA lake freezes solid.
O A copper bar is rolled into a flat sheet.
O Gravel, sand, and water are mixed.
O Vinegar bubbles when baking soda is added.

Answer 1

Vinegar when baking soda is added!!! The vinegar reacts with the baking soda and it makes it bubble :)

Xoxoxo

Answer 2

Vinegar and baking soda

Step-by-step explanation:

The others are physical changes, not chemical changes. This is because they do not change chemical properties or undergo a reaction.

However, when vinegar and baking soda are added together, it is a chemical change, because there is not only a reaction, but a change in its properties. Hopefully this helps!