Podcast Beta
Questions and Answers
What type of change is the digestion of food?
In the fermentation of grapes to make wine, what type of change occurs?
What is the brownish substance that forms on iron when left in the open for some time called?
What kind of change is the burning of coal?
Signup and view all the answers
During the explosion of fireworks, what type of change takes place?
Signup and view all the answers
What type of change occurs during the ripening of fruits?
Signup and view all the answers
Why is rusting a significant concern for iron articles like bridges, ships, and cars?
Signup and view all the answers
In the equation 'Magnesium (Mg) + Oxygen (O2) Magnesium oxide (MgO)', what does the arrow imply?
Signup and view all the answers
When burning a magnesium ribbon, what substance is formed as a powdery ash after complete combustion?
Signup and view all the answers
What is the process called when iron reacts with oxygen in the presence of water or air moisture to form rust?
Signup and view all the answers
Is the process of photosynthesis a physical or a chemical change?
Signup and view all the answers
Which of the following best describes the chemical change that occurs when iron is left in a moist environment and rust forms?
Signup and view all the answers
What form of magnesium oxide is left behind as a powdery ash after burning a magnesium ribbon?
Signup and view all the answers
Which natural phenomenon does ozone help protect against by absorbing ultraviolet radiation?
Signup and view all the answers
How does galvanisation help in preventing rusting of iron articles?
Signup and view all the answers
What is one effective method mentioned in the text to prevent rusting of iron articles?
Signup and view all the answers
In the context of rusting, what would happen if iron articles are left in a high humidity environment for an extended period?
Signup and view all the answers
What impact does the presence of both oxygen and water have on the process of rusting?
Signup and view all the answers
