Open Tay Learning

Rates of reaction

If you add vinegar to bicarbonate of soda, the mixture will fizz – this shows that a gas is being given off.

If you boil water in a kettle, steam is produced.


Only one of these is an example of a chemical reaction – which do you think it is?

A) Boiling a kettle                                         B) Adding vinegar to bicarbonate of soda


Clue: The answer is the one which produces a new substance



When water boils, the liquid water turns to steam, but it is still water even though it has changed into a gas.Steam can also change back to water. So this is an example of a physical change.

When vinegar and bicarbonate of soda meet, the gas given off is a new substance called CARBON DIOXIDE. It is not possible to separate these back into vinegar and bicarbonate of soda.

So in this case: a chemical reaction has taken place. Adding vinegar to bicarbonate of soda is the correct answer.

Our Collaborators
Open Tay Learning CollaboratorsOpen Tay Learning Collaborators

© 2023 Tayside Regional Improvement Collaborative

Website by Internet Creation Ltd

Skip to content