Last week we tried a basic chemical reaction to investigate alka seltzer reacting through water. We’ve additionally observed the reaction between baking soda and vinegar before, both of which are an extremely safe for also young children to observe.

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Taking this a step more we’re going to investigate how to rate up a chemistry reaction, while still maintaining things very straightforward and easy to understand.

The nature of the reactants

Reactants are the 2 substances you combine to get the reaction. Part react slowly and also some much faster depending on the bonds that should be broken. Because that example, gold is very unreactive, when sodium and potassium are so reactive that they tarnish instantly once exposed to the air.

Particle Size

The smaller sized the corpuscle the much faster the reaction, this is since there is a larger surface area easily accessible to react with the other substance.


The higher the concentration, the faster the reaction, this is since there is an ext of the reactive substance easily accessible to react. We’ve observed this very simply in the previous by adding an ext alka seltzer to a lava desk lamp which provides a bigger and faster reaction.


The greater the temperature the faster the reaction, this is because if you warmth up a substance the corpuscle have more energy and move roughly faster definition they have much more contact through the various other reactive substance.

We’ve design a very basic experiment to demonstrate this using alka seltzer and also hot and also cold water.

Please be careful when trying this at residence that the water you use isn’t too hot as it can spill out or burst the balloon, specifically if you usage a smaller container.

How to speed up a chemical reaction

Can girlfriend guess which of these 4 jars consisted of the warmest water?


A Catalyst is a substance that speeds up a chemistry reaction however is not changed itself by the reaction and can be provided again. Instances of catalysts incorporate platinium i beg your pardon is used in auto exhausts to malfunction harmful emissions and yeast is a organic catalyst that increases the process of fermentation.

The opposite result is prove by food in a fridge, the cooler temperature slows down the reaction in between oxygen and also bacteria that makes the food spoil. Maintaining your food fresher for longer.

Suitable for vital Stage 3 – chemical Reactions


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These activities are designed to be lugged out by youngsters working through a parent, guardian or other appropriate adult. The adult affiliated is totally responsible for ensuring the the tasks are carried out safely.