45 Questions
What is the product formed when zinc reacts with oxygen?
Zinc oxide
What property of zinc oxide makes it an effective protective layer?
Non-porousness
What is the purpose of galvanizing steel?
To protect it from corrosion
Where are galvanised flooring commonly used?
Industrial settings
What accelerates rusting?
Moist or corrosive environments
What makes the environment near the ocean more corrosive?
Presence of salt in the air
Where can galvanised watering cans be commonly found?
Gardening
What happens when the zinc coating is scratched?
The underlying zinc can still protect the iron
What is the primary reason for rust formation?
Reaction with oxygen
What is the main purpose of painting metal?
To protect it from corrosion
What is the disadvantage of using paint to prevent rust?
It can be scratched or peel off over time
What is the purpose of coating iron with chromium?
To prevent it from rusting
What is the process of coating iron with a thin layer of zinc?
Galvanising
What is an example of a material that can be used as a barrier to prevent rust?
Paint
Why is chromed metal resistant to rust?
Because chromium does not react with oxygen in the same way as iron
What is the primary function of a barrier in preventing rust?
To provide a protective layer between the metal and oxygen
Why is galvanising with zinc effective in preventing rust?
Zinc is less reactive than iron and forms a protective layer
What happens when the paint on a metal surface is scratched or peeled off?
The metal is exposed to oxygen and can rust
What is the advantage of using chromed metal over galvanised metal?
Chromed metal is more resistant to corrosion
Why does rust form on metal surfaces?
When metal comes into contact with oxygen
What is the common feature of chromed metal and galvanised metal?
They are both coated with a protective layer
What is the outcome of oxidisation of iron?
The formation of iron oxide
What is the chemical equation for the reaction between zinc and oxygen?
2Zn + O2 → 2ZnO
What is the primary function of galvanised products?
To protect the underlying material from corrosion
Which of the following environments is most conducive to rusting?
Moist and corrosive
What type of oxide layer is formed when zinc reacts with oxygen?
Non-porous and dense
What is a common application of galvanised panels?
Roofs and walls
What happens to the underlying zinc when the galvanised coating is scratched?
It forms a new protective oxide layer
What accelerates rusting in industrial areas?
Presence of acids
What is a common use of galvanised nuts and bolts?
In construction for their durability
What is the primary mechanism by which paint prevents rust?
By providing a physical barrier between the metal and oxygen
What is the main advantage of using chromium coating over galvanising with zinc?
Chromium coating is more durable and resistant to scratches
What happens when the zinc coating on a galvanised metal is scratched or peeled off?
The metal surface becomes more exposed to the environment, allowing rust to form
What is the primary reason why chromed metal is resistant to rust?
Chromium does not react with oxygen in the same way as iron
What is the main limitation of using paint as a barrier to prevent rust?
Paint can be easily scratched or peeled off, exposing the metal underneath
What is the primary function of a barrier in preventing rust?
To provide a physical barrier between the metal and oxygen
Why is galvanising with zinc effective in preventing rust?
Zinc reacts with oxygen to form a protective oxide layer
What is the primary reason why galvanised products are preferred in construction and household items?
Corrosion resistance and rust prevention
What is the result of the reaction between zinc and oxygen?
Creation of a dense and non-porous oxide layer
Why does rusting occur more rapidly in environments with high humidity and salt presence?
The combination of salt and moisture increases the corrosion rate
What is the primary advantage of using galvanised products over other corrosion protection methods?
Self-healing properties of the zinc oxide layer
What is the primary difference between the oxide layer formed by zinc and chromium?
Porous vs non-porous structure
Why do galvanised products continue to protect the underlying metal even when scratched?
A new protective oxide layer forms upon exposure to oxygen
What is the common feature of environments that accelerate rusting?
Moisture and presence of acids
What is the primary benefit of using galvanised products in industrial settings?
Improved corrosion resistance and rust prevention
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