Causes of rusting practice exercise 4

A farmer noticed that his jembe, left under a leaking roof, had brown patches after three days. What most likely caused the rust?

A farmer noticed that his jembe, left under a leaking roof, had brown patches after three days. What most likely caused the rust?  (1 mark)

A farmer noticed that his jembe, left under a leaking roof, had brown patches after three days. What most likely caused the rust?  (1 mark)

A machine part made of iron is left outdoors where dew forms every night. Why does rusting occur more at night than during the day?

A machine part made of iron is left outdoors where dew forms every night. Why does rusting occur more at night than during the day?  (1 mark)

A machine part made of iron is left outdoors where dew forms every night. Why does rusting occur more at night than during the day?  (1 mark)

A pupil noticed her school gate rusted more at the bottom than the top. What could be the reason?

A pupil noticed her school gate rusted more at the bottom than the top. What could be the reason?  (1 mark)

A pupil noticed her school gate rusted more at the bottom than the top. What could be the reason?  (1 mark)

In a classroom activity, learners placed three identical nails in different liquids: tap water, salty water, and cooking oil. Which nail is most likely to rust?

In a classroom activity, learners placed three identical nails in different liquids: tap water, salty water, and cooking oil. Which nail is most likely to rust?  (1 mark)

In a classroom activity, learners placed three identical nails in different liquids: tap water, salty water, and cooking oil. Which nail is most likely to rust?  (1 mark)

The diagram below shows two iron buckets: one is covered and dry, the other is left outside in the rain. Which one will rust, and why? Diagram Description: Bucket A under a shed and dry; Bucket B exposed to rain with water droplets on it.

The diagram below shows two iron buckets: one is covered and dry, the other is left outside in the rain. Which one will rust, and why? (1 mark)

The diagram below shows two iron buckets: one is covered and dry, the other is left outside in the rain. Which one will rust, and why? (1 mark)

The diagram shows two iron tools: one left outside on wet grass overnight and one stored in a dry toolbox. Which tool is likely to rust, and why? Diagram Description: Tool A on wet grass; Tool B inside a dry box.

The diagram shows two iron tools: one left outside on wet grass overnight and one stored in a dry toolbox. Which tool is likely to rust, and why?  (1 mark)

The diagram below shows two iron tools: one left outside on wet grass overnight and one stored in a dry toolbox. Which tool is likely to rust, and why?  (1 mark)

The table shows four iron samples in different environments. Which sample will rust the fastest? SampleEnvironmentCondition Description ADesert areaVery dry, high temperatures BCoastal regionHumid with salty air CMountain topCold, thin air, little moisture DIndoor storageDry and covered

The table shows four iron samples in different environments. Which sample will rust the fastest?  (1 mark) Sample Environment Condition Description A Desert area Very dry, high temperatures B Coastal region Humid with salty air C Mountain top Cold, thin air, little moisture D Indoor storage Dry and covered

The table shows four iron samples in different environments. Which sample will rust the fastest?  (1 mark) Sample Environment Condition Description A Desert area Very dry, high temperatures B Coastal region Humid with salty air C Mountain top Cold, thin air, little moisture D Indoor storage Dry and covered

The table below shows four iron samples in different environments. Which sample will rust the fastest?  (1 mark) Sample Environment Condition Description A Desert area Very dry, high temperatures B Coastal region Humid with salty air C Mountain top Cold, thin air, little moisture D Indoor storage Dry and covered

Which chemical reaction correctly represents the formation of rust?

Which chemical reaction correctly represents the formation of rust?  (1 mark)

Which chemical reaction correctly represents the formation of rust?  (1 mark)

Which of the following best explains why acids accelerate rusting?

Which of the following best explains why acids accelerate rusting?  (1 mark)

Which of the following best explains why acids accelerate rusting?  (1 mark)

Why does rusting weaken metallic structures such as bridges and gates?

Why does rusting weaken metallic structures such as bridges and gates?  (1 mark)

Why does rusting weaken metallic structures such as bridges and gates?  (1 mark)