10 Questions
What are properties such as shape, size, color, and state of a substance called?
Physical properties
What is a change in which a substance undergoes a change in its physical properties called?
Physical change
What is the brownish substance that forms on iron when it is left in the open for some time?
Rust
What is the equation representing the formation of magnesium oxide from magnesium and oxygen?
Magnesium (Mg) + Oxygen (O2) → Magnesium oxide (MgO)
What happens to iron gates, benches, and other iron articles when exposed to the open environment for some time?
They get rusted
What precautions should be taken when demonstrating the burning of magnesium ribbon?
Teachers should advise children not to stare at the burning ribbon.
What new substance is formed when magnesium oxide reacts with water?
Magnesium hydroxide [Mg(OH)2]
How can you classify the aqueous solution obtained after mixing the ash of burnt magnesium with water?
Basic
What is the process of rusting represented by in terms of a chemical equation?
Iron (Fe) + Oxygen (O2, from the air) + Water (H2O) → rust (iron oxide Fe2O3)
What are some ways to prevent rusting of iron articles?
Apply a coat of paint or grease regularly, or deposit a layer of a metal like chromium or zinc on iron.
Test your knowledge on chemical changes with this quiz. Learn about the differences between physical and chemical changes, such as rusting of iron. Explore how substances transform into new materials through chemical reactions.
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