Activity of text interpretation, aimed at students in the fifth year of elementary school, about rusting. Why do some objects rust? Let's understand this process? For this, read the text carefully! Then answer the various interpretative questions proposed!
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SCHOOL: DATE:
PROF: CLASS:
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That mechanical pencil you adore, notice, it already seems to have a few specks of rust. Before you complain, pay attention: it is fatal for objects made from iron, over time, to rust. From tiny dots to large corrosion, the process is the same and completely natural: it includes iron, oxygen and water.
In fact, iron does react with oxygen, so much so that the most pompous name for rust is iron oxidation. Want to know where the water comes into this story? Well then, water – in liquid or vapor form – is important in this process because it helps iron to combine with oxygen, forming iron oxide – rust. So, it is correct to say that rust formation is almost imperceptible when there is no water involved. It is this that accelerates the corrosion process. Then you lose mechanical pencils, cars, appliances...
To avoid rust, the tip is to keep the objects clean, dry and, if possible, lubricated. It is worth painting or covering the piece you want to protect with oil paint or varnish. Thus, water and oxygen will not come into direct contact with iron.
To prevent oxidation, industries increasingly use steel, that is, an alloy of iron with carbon. The so-called stainless steel does not rust because it is added with two other chemical elements: nickel and chromium. In fact, adding chrome to iron to make objects more resistant was fashionable in the 1960s and 1970s. At that time, it was common to find, for example, chrome car bumpers, table feet, blender base.
Well, now that you know why your mechanical pencil rusted, you can prevent the same from happening to other utensils you want to preserve.
Joab Trajano Silva. “Ciência Hoje das Crianças” magazine. Edition 166.
Available in: .
Question 1 - Read back:
“From the tiny dots to the big corrosions, the process is the same and totally natural: it includes iron, oxygen and water.”
What process does the text refer to?
Question 2 - In the excerpt “It is this that accelerates the corrosion process.”, the author expresses an action:
Question 3 - In the segment “It's worth painting or cover the piece you want to protect with oil paint or varnish.”, the term underlined begins a fact that:
( ) is added to another.
( ) is the cause of another.
( ) is an option to another.
Question 4 - In the passage "Thus, water and oxygen will not come into direct contact with iron.”, the underlined word indicates:
( ) place.
( ) mode.
( ) time.
Question 5 - In the sentence "For prevent oxidation, industries increasingly use steel, that is, an alloy of iron with carbon.”, the highlighted term introduces:
( ) a purpose.
( ) a conclusion.
( ) a justification.
Question 6 – In “The so-called stainless steel does not rust why it is added with two other chemical elements […]”, the underlined word could be replaced by:
( ) "because".
( ) "However".
( ) "that is why".
Question 7 – In the part “Well, now that you know why your mechanical pencil rusted, you can prevent the same from happening with other utensils you want to preserve.”, the author:
( ) makes an appeal.
( ) exposes a criticism.
( ) gives guidance.
Question 8 – The author talks directly to the reader in the excerpt:
( ) "That mechanical pencil you love, notice, it already seems to have a few spots of rust."
( ) “[…] the formation of rust is almost imperceptible when there is no water involved.”
( ) “[…] it was common to find, for example, car bumpers, table feet […]”
By Denyse Lage Fonseca
Graduated in Languages and specialist in distance education.
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