Gr 9 NATURAL SCIENCES: CH 2.3.5 Ways to prevent rust

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What is the product formed when zinc reacts with oxygen?

Zinc nitrate

Zinc sulfide

Zinc hydroxide

Zinc oxide (correct)

What property of zinc oxide makes it an effective protective layer?

Reactivity

Non-porousness (correct)

Porosity

Porousness

What is the purpose of galvanizing steel?

To protect it from corrosion (correct)

To make it more durable

To change its color

To increase its strength

Where are galvanised flooring commonly used?

Industrial settings Signup and view all the answers

What accelerates rusting?

Moist or corrosive environments Signup and view all the answers

What makes the environment near the ocean more corrosive?

Presence of salt in the air Signup and view all the answers

Where can galvanised watering cans be commonly found?

Gardening Signup and view all the answers

What happens when the zinc coating is scratched?

The underlying zinc can still protect the iron Signup and view all the answers

What is the primary reason for rust formation?

Reaction with oxygen Signup and view all the answers

What is the main purpose of painting metal?

To protect it from corrosion Signup and view all the answers

What is the disadvantage of using paint to prevent rust?

It can be scratched or peel off over time Signup and view all the answers

What is the purpose of coating iron with chromium?

To prevent it from rusting Signup and view all the answers

What is the process of coating iron with a thin layer of zinc?

Galvanising Signup and view all the answers

What is an example of a material that can be used as a barrier to prevent rust?

Paint Signup and view all the answers

Why is chromed metal resistant to rust?

Because chromium does not react with oxygen in the same way as iron Signup and view all the answers

What is the primary function of a barrier in preventing rust?

To provide a protective layer between the metal and oxygen Signup and view all the answers

Why is galvanising with zinc effective in preventing rust?

Zinc is less reactive than iron and forms a protective layer Signup and view all the answers

What happens when the paint on a metal surface is scratched or peeled off?

The metal is exposed to oxygen and can rust Signup and view all the answers

What is the advantage of using chromed metal over galvanised metal?

Chromed metal is more resistant to corrosion Signup and view all the answers

Why does rust form on metal surfaces?

When metal comes into contact with oxygen Signup and view all the answers

What is the common feature of chromed metal and galvanised metal?

They are both coated with a protective layer Signup and view all the answers

What is the outcome of oxidisation of iron?

The formation of iron oxide Signup and view all the answers

What is the chemical equation for the reaction between zinc and oxygen?

2Zn + O2 → 2ZnO Signup and view all the answers

What is the primary function of galvanised products?

To protect the underlying material from corrosion Signup and view all the answers

Which of the following environments is most conducive to rusting?

Moist and corrosive Signup and view all the answers

What type of oxide layer is formed when zinc reacts with oxygen?

Non-porous and dense Signup and view all the answers

What is a common application of galvanised panels?

Roofs and walls Signup and view all the answers

What happens to the underlying zinc when the galvanised coating is scratched?

It forms a new protective oxide layer Signup and view all the answers

What accelerates rusting in industrial areas?

Presence of acids Signup and view all the answers

What is a common use of galvanised nuts and bolts?

In construction for their durability Signup and view all the answers

What is the primary mechanism by which paint prevents rust?

By providing a physical barrier between the metal and oxygen Signup and view all the answers

What is the main advantage of using chromium coating over galvanising with zinc?

Chromium coating is more durable and resistant to scratches Signup and view all the answers

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 Signup and view all the answers

What is the primary reason why chromed metal is resistant to rust?

Chromium does not react with oxygen in the same way as iron Signup and view all the answers

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 Signup and view all the answers

What is the primary function of a barrier in preventing rust?

To provide a physical barrier between the metal and oxygen Signup and view all the answers

Why is galvanising with zinc effective in preventing rust?

Zinc reacts with oxygen to form a protective oxide layer Signup and view all the answers

What is the primary reason why galvanised products are preferred in construction and household items?

Corrosion resistance and rust prevention Signup and view all the answers

What is the result of the reaction between zinc and oxygen?

Creation of a dense and non-porous oxide layer Signup and view all the answers

Why does rusting occur more rapidly in environments with high humidity and salt presence?

The combination of salt and moisture increases the corrosion rate Signup and view all the answers

What is the primary advantage of using galvanised products over other corrosion protection methods?

Self-healing properties of the zinc oxide layer Signup and view all the answers

What is the primary difference between the oxide layer formed by zinc and chromium?

Porous vs non-porous structure Signup and view all the answers

Why do galvanised products continue to protect the underlying metal even when scratched?

A new protective oxide layer forms upon exposure to oxygen Signup and view all the answers

What is the common feature of environments that accelerate rusting?

Moisture and presence of acids Signup and view all the answers

What is the primary benefit of using galvanised products in industrial settings?

Improved corrosion resistance and rust prevention Signup and view all the answers

Gr 9 NATURAL SCIENCES: CH 2.3.5 Ways to prevent rust

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Questions and Answers

What is the product formed when zinc reacts with oxygen?

What property of zinc oxide makes it an effective protective layer?

What is the purpose of galvanizing steel?

Where are galvanised flooring commonly used?

What accelerates rusting?

What makes the environment near the ocean more corrosive?

Where can galvanised watering cans be commonly found?

What happens when the zinc coating is scratched?

What is the primary reason for rust formation?

What is the main purpose of painting metal?

What is the disadvantage of using paint to prevent rust?

What is the purpose of coating iron with chromium?

What is the process of coating iron with a thin layer of zinc?

What is an example of a material that can be used as a barrier to prevent rust?

Why is chromed metal resistant to rust?

What is the primary function of a barrier in preventing rust?

Why is galvanising with zinc effective in preventing rust?

What happens when the paint on a metal surface is scratched or peeled off?

What is the advantage of using chromed metal over galvanised metal?

Why does rust form on metal surfaces?

What is the common feature of chromed metal and galvanised metal?

What is the outcome of oxidisation of iron?

What is the chemical equation for the reaction between zinc and oxygen?

What is the primary function of galvanised products?

Which of the following environments is most conducive to rusting?

What type of oxide layer is formed when zinc reacts with oxygen?

What is a common application of galvanised panels?

What happens to the underlying zinc when the galvanised coating is scratched?

What accelerates rusting in industrial areas?

What is a common use of galvanised nuts and bolts?

What is the primary mechanism by which paint prevents rust?

What is the main advantage of using chromium coating over galvanising with zinc?

What happens when the zinc coating on a galvanised metal is scratched or peeled off?

What is the primary reason why chromed metal is resistant to rust?

What is the main limitation of using paint as a barrier to prevent rust?

What is the primary function of a barrier in preventing rust?

Why is galvanising with zinc effective in preventing rust?

What is the primary reason why galvanised products are preferred in construction and household items?

What is the result of the reaction between zinc and oxygen?

Why does rusting occur more rapidly in environments with high humidity and salt presence?

What is the primary advantage of using galvanised products over other corrosion protection methods?

What is the primary difference between the oxide layer formed by zinc and chromium?

Why do galvanised products continue to protect the underlying metal even when scratched?

What is the common feature of environments that accelerate rusting?

What is the primary benefit of using galvanised products in industrial settings?

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