Chemical Changes Quiz
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Questions and Answers

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?

<p>Magnesium (Mg) + Oxygen (O2) → Magnesium oxide (MgO)</p> Signup and view all the answers

What happens to iron gates, benches, and other iron articles when exposed to the open environment for some time?

<p>They get rusted</p> Signup and view all the answers

What precautions should be taken when demonstrating the burning of magnesium ribbon?

<p>Teachers should advise children not to stare at the burning ribbon.</p> Signup and view all the answers

What new substance is formed when magnesium oxide reacts with water?

<p>Magnesium hydroxide [Mg(OH)2]</p> Signup and view all the answers

How can you classify the aqueous solution obtained after mixing the ash of burnt magnesium with water?

<p>Basic</p> Signup and view all the answers

What is the process of rusting represented by in terms of a chemical equation?

<p>Iron (Fe) + Oxygen (O2, from the air) + Water (H2O) → rust (iron oxide Fe2O3)</p> Signup and view all the answers

What are some ways to prevent rusting of iron articles?

<p>Apply a coat of paint or grease regularly, or deposit a layer of a metal like chromium or zinc on iron.</p> Signup and view all the answers

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