Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Malleability is a physical property of metals that allows them to be hammered, pressed, or rolled into thin sheets without breaking.
Most metals are malleable. Gold () and Silver () are among the most malleable metals known.
Non-metals do not show malleability. They are 'brittle', meaning they break into small pieces or powder when struck with a hammer.
Aluminum () is highly malleable and is used to manufacture thin foils for wrapping food items.
The property of malleability is used in making various metallic objects like utensils, agricultural tools, and decorative foils.
📐Formulae
💡Examples
Problem 1:
Identify which of the following substances will show the property of malleability: Iron nail (), Coal piece (), Aluminum wire (), and Pencil lead ( in the form of graphite).
Solution:
Iron nail () and Aluminum wire ().
Explanation:
Iron and Aluminum are metals, and metals are malleable, meaning they can be beaten into sheets. Coal and pencil lead are forms of Carbon (), which is a non-metal and is brittle, so they will break instead of forming sheets.
Problem 2:
Why is Silver () used for decorating sweets like 'Kaju Katli'?
Solution:
Due to its high malleability.
Explanation:
Silver () is extremely malleable, allowing it to be beaten into incredibly thin foils (called 'vark') that are safe and thin enough to be used as decoration on food items.