Is a clear liquid vinegar and a white powder, baking soda and physical reaction?

Yes, when you combine a clear liquid vinegar (which is an acetic acid solution) and a white powder baking soda (which is sodium bicarbonate), a physical and chemical reaction occurs. This reaction produces carbon dioxide gas, water, and sodium acetate. The visible signs of the reaction include bubbling and fizzing as the carbon dioxide gas is released.

This process is primarily a chemical reaction, but the mixing of the two substances can also be considered a physical reaction because it involves the combination of different states of matter (liquid and solid) to produce a new mixture and gas.