Ch 04 - The World of Metals and Non-metals7th Science
Element
What is the scientific definition of an 'Element' in the context of materials?
What is the scientific definition of an 'Element' in the context of materials?
An Element is a substance that cannot be broken down into simpler substances by chemical reactions.
- It serves as the fundamental building block of all matter.
- Examples: Iron (Fe), Copper (Cu), Oxygen (O2), Sulfur (S).
- Classification: Elements are broadly classified into Metals, Non-metals, and Metalloids based on their physical and chemical properties.
Prism Memory Hook
Elements are the Elementary building blocks.
Malleability
What happens when metals like iron or aluminium are beaten with a hammer, and what is this property called?
What happens when metals like iron or aluminium are beaten with a hammer, and what is this property called?
When beaten, these metals flatten into thin sheets without breaking.
Property: Malleability
- Definition: The physical property of metals that allows them to be beaten or rolled into thin sheets under compressive stress.
- Examples: Aluminium foil (used for wrapping food), Silver foil (used for decorating sweets).
- Most Malleable Metals: Gold (Au) and Silver (Ag).
Prism Memory Hook
Mallet makes Malleable sheets.
Ductility
Which property allows metals to be used in electrical wiring and musical instruments?
Which property allows metals to be used in electrical wiring and musical instruments?
Property: Ductility
- Definition: The physical property of metals that allows them to be drawn, stretched, or pulled into thin wires under tensile stress.
- Examples: Copper wire, Aluminium wire.
- Fact: Gold is the most ductile metal (1 gram of gold can be stretched into a wire about 2 kilometers long).
Prism Memory Hook
Ductility draws into ducts or wires.
Also in this chapter
31 more cards to study in Prism
- 4Sonority
- 5Brittleness
- 6Thermal & Electrical Conductivity
- 7Hardness Exceptions in Metals
- 8Liquid Metal Exception
- 9Electrical Conductivity Exception
- 10Metals vs Non-Metals Summary
- 11Burning of Magnesium
- 12Nature of Metal Oxides
- 13Burning of Sulfur
- 14Formation of Sulfurous Acid
- 15Deflagrating Spoon
- 16Nature of Non-Metal Oxides
- 17Reaction of Metals with Acids
- 18Reaction of Sodium with Water
- 19Storage of Sodium
- 20Storage of Phosphorus
- 21Conditions for Rusting
- 22Corrosion Colors
- 23Galvanisation
- 24Essential Non-Metals for Life
- 25Applications of Common Metals
- 26Corrosion of Copper
- 27Sulfur in Vulcanisation
- 28Alloys
- 29Recycling of Metals
- 30Historical Metallurgy & The Harappan Civilization
- 31Strategic Metals (Titanium & Zirconium)
- 32Traditional Indian Metallurgy
- 33Metalloids
- 34Noble Metals and Aqua Regia
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