20. Higher order thinking skills III

 

No. Rusting is bad for iron materials. Rust is a kind of iron oxideRust is a kind of steel oxideRust is a kind of corrode oxideRust is a kind of metal oxide. It happens when iron reacts with the oxygen in the airoxygen in the smokeoxygen in the plantoxygen in the water, causing it to rust. Rust can affect iron and its alloys. It makes them weaker by displacing the strong iron with flaky powder.

 

 

No, not all the fruits. Biologic browningAtmospheric browningEnzymic browningMetallic browning can be noticed in fruits like apricots, pears, bananas, grapes and avocados and vegetables like aubergines, potatoes, lettuce. When the enzyme polyphenol oxidase or tyrosinase comes into contact with carboncontact with nitrogencontact with oxygencontact with hydrogen, it catalyses a biochemical reaction that converts phenolic compounds in plants into brown pigments called melanin, causing the fruit or vegetable to turn brown.