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Chemical reactions

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Harvey Buckle

on 25 September 2017

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Transcript of Chemical reactions

To know the differences between physical and chemical changes
To be able to demonstrate this with a series of processes
To answer related questions
1. Change in appearance
Rusting involves shiny, grey coloured iron becoming red and crumbly iron oxide

Another example of change in appearance is seen when adding iodine solution to starch. This will cause a reaction which changes the iodine solution from orange-brown to blue-black.
2. Energy change
Car engines release the chemical energy trapped in petrol to allow cars to move:

hydrocarbons + oxygen → carbon dioxide + water

However, even though energy is released, it is omitted from the equation as only the names of chemicals are included in equations.
3. Making a new substance
Burning charcoal has a main reaction of:

carbon + oxygen → carbon dioxide
Describe a chemical reaction that happens in your home. Write it down.
Chemical changes
Chemical reactions usually involve a change in appearance (e.g. colour) or a detectable energy change (e.g. involving heat, light or sound).

All chemical reactions involve the formation of one or more new substances.
Chemical reactions
1. Dissolving
2. State changes
Physical changes
Lets have a go at some!
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