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Questions and Answers
Burning is always accompanied by the production of heat.
Burning is always accompanied by the production of heat.
True (A)
Photosynthesis is a physical change.
Photosynthesis is a physical change.
False (B)
Digestion is a chemical change.
Digestion is a chemical change.
True (A)
The change of colour in a slice of apple is a physical change.
The change of colour in a slice of apple is a physical change.
Rusting is a chemical change that affects copper articles.
Rusting is a chemical change that affects copper articles.
Oxygen plays a crucial role in rusting.
Oxygen plays a crucial role in rusting.
Galvanisation prevents rusting by coating iron with copper.
Galvanisation prevents rusting by coating iron with copper.
Rusting can be prevented by storing iron articles in airtight containers.
Rusting can be prevented by storing iron articles in airtight containers.
The monetary loss due to rusting is very low.
The monetary loss due to rusting is very low.
Neutralisation is a physical change.
Neutralisation is a physical change.
Study Notes
Rusting of Iron
- Rusting is a process that can be represented by the equation: Iron (Fe) + Oxygen (O2) + water (H2O) → rust (iron oxide Fe2O3)
- Rusting requires the presence of both oxygen and water (or water vapor)
- High moisture content in the air accelerates rusting
- Ways to prevent rusting:
- Applying a coat of paint or grease to prevent contact with oxygen and water
- Depositing a layer of metal like chromium or zinc on iron
Ozone Layer
- The ozone layer protects us from harmful ultraviolet radiation from the sun
- Ozone breaks down to form oxygen when absorbing ultraviolet radiation
- The breaking down of ozone is a chemical change
Chemical Changes
- Other examples of chemical changes:
- Magnesium ribbon burning in air to form magnesium oxide
- Food spoilage producing a foul smell
- Digestion
- Photosynthesis
- Neutralization of an acid with a base
- Chemical changes involve the formation of new substances
- Chemical equations use an arrow to imply "becomes" and do not need to be balanced at this stage
Physical and Chemical Changes
- Burning is accompanied by production of heat
- Fireworks explosion is a chemical change producing heat, light, sound, and unpleasant gases
- Chemical changes can result in significant effects, such as monetary loss due to rusting
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Description
Learn about the process of rusting, its chemical equation, and the required conditions for rusting to occur.
