Baking powder mixed with vinegar is physical change?

* Baking powder contains sodium bicarbonate (NaHCO₃) and an acidic component.

* Vinegar is a dilute solution of acetic acid (CH₃COOH).

When you mix these together, the acid in the vinegar reacts with the sodium bicarbonate in the baking powder. This chemical reaction produces:

* Carbon dioxide gas (CO₂) which causes bubbles and helps leavening in baking.

* Sodium acetate (NaCH₃COO)

* Water (H₂O)

Key characteristics of a chemical change:

* New substances are formed. In this case, the baking powder and vinegar react to produce carbon dioxide, sodium acetate, and water – these are different substances from the original ingredients.

* The change is usually irreversible. You can't easily separate the carbon dioxide back out of the mixture.

* There is often a change in energy. The reaction between the baking powder and vinegar releases heat, which you might feel.

Therefore, the reaction between baking powder and vinegar is a chemical change, not a physical change.