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Chemical Change - Evidence of Chemical Change
What happens when bicarbonate soda is added to vinegar?

Carbon dioxide forms which foams and bubbles inside the beaker. Bubbling is evidence of a chemical change.

Carbon dioxide extinguishes the flame by displacing oxygen the fire needs to burn.

A physical change is a change in the physical properties of a substance. A chemical change is a change in the composition of a substance. Chemical changes can happen even if no heat or energy is used and the substances do not react with each other. Physical changes require heat or energy to happen.

How does the different states of matter relate to chemical reactions?

Different states of matter can be used to determine which type of reaction will take place. Solid substances cannot dissolve in water, so they will not undergo chemical reactions. Liquids will undergo chemical reactions because they can dissolve in water and react with each other, and gases will react because they are able to move around and react with each other.

What chemical reaction takes place when bicarbonate soda and vinegar are mixed?

The reaction is a chemical reaction called an acid-base reaction. The acid in the vinegar reacts with the base in the bicarbonate soda to create carbon dioxide gas and sodium acetate.