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