Send the link below via email or IMCopy
Present to your audienceStart remote presentation
- Invited audience members will follow you as you navigate and present
- People invited to a presentation do not need a Prezi account
- This link expires 10 minutes after you close the presentation
- A maximum of 30 users can follow your presentation
- Learn more about this feature in our knowledge base article
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 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.
2. State changes
Lets have a go at some!