Class 7 Science - UP
The World of Metals and Non-metals
In the chapter 'The World of Metals and Non-metals', Class 7 UP Board students explore the physical and chemical properties of various elements found in nature. You will learn how to distinguish between shiny, hard materials like iron and copper, and brittle, dull materials like sulfur and carbon. The chapter covers important concepts such as malleability, ductility, electrical and thermal conductivity, and chemical reactions with oxygen and water. Understanding these properties is essential for your UP Board science exams as it forms the foundation for advanced chemistry in higher classes and helps explain everyday phenomena around you.
Start Learning FreeKey Concepts
Physical Properties of Metals
Metals are generally hard, lustrous (shiny), malleable (can be beaten into sheets), ductile (can be drawn into wires), and are good conductors of heat and electricity.
Physical Properties of Non-metals
Non-metals are mostly soft, dull in appearance, non-malleable, brittle, and poor conductors of heat and electricity, existing in solid, liquid, or gaseous states.
Malleability and Ductility
Malleability is the property by which metals can be beaten into thin sheets, while ductility is the ability to be drawn into thin wires.
Reaction with Oxygen
Metals react with oxygen to form basic oxides, whereas non-metals react with oxygen to form acidic or neutral oxides.
Displacement Reactions
A more reactive metal displaces a less reactive metal from its salt solution in water.
Important Formulas
Board Exam Info
In the UP Board Class 7 Science examinations, this chapter typically carries around 6 to 8 marks. Questions frequently include short-answer questions on physical differences, differentiating between metals and non-metals, reasons why certain materials are used for specific purposes (like copper wires), and balanced word equations for chemical reactions.
Frequently Asked Questions
Why are electric wires made of copper and not coal?
Copper is a metal which is a good conductor of electricity and is ductile, whereas coal is a non-metal, brittle, and a poor conductor of electricity.
Which liquid metal and liquid non-metal exist at room temperature?
Mercury is the only metal that exists in a liquid state at room temperature, and Bromine is the only liquid non-metal.
Why do iron objects rust in the rainy season?
Iron reacts with oxygen and moisture (water vapor) present in the air to form a reddish-brown layer called rust.
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