Class 7 Science - MP
The World of Metals and Non-metals
In the chapter 'The World of Metals and Non-metals', Class 7 MP Board students explore the fascinating physical and chemical properties of various elements. You will learn how to distinguish between shiny, malleable metals like iron and copper, and brittle, dull non-metals like coal and sulfur. The chapter also covers how these substances react with oxygen, water, and acids, and introduces the concept of displacement reactions. This is a very important chapter for your annual science board exams, as it builds the foundational chemistry concepts needed for higher classes and frequently features in objective and descriptive questions.
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.
Reaction with Oxygen
When metals react with oxygen, they form basic oxides (e.g., magnesium oxide). Non-metals react with oxygen to form acidic or neutral oxides.
Reaction with Acids
Most metals react with dilute acids to produce metal salts and hydrogen gas, which burns with a pop sound. Non-metals generally do not react with acids.
Displacement Reactions
A more reactive metal can displace a less reactive metal from its salt solution in water.
Important Formulas
Board Exam Info
In the MP Board Class 7 Science examination, this chapter usually carries around 6 to 8 marks. Questions commonly include fill-in-the-blanks, true/false, differentiating between metals and non-metals, and explaining chemical reactions like the pop sound test for hydrogen gas.
Frequently Asked Questions
Why are electric wires made of copper or aluminium?
Copper and aluminium are metals that are excellent conductors of electricity and are ductile, meaning they can easily be drawn into thin wires.
Which non-metal is liquid at room temperature?
Bromine is the only non-metal that exists in a liquid state at room temperature.
Why do we store sodium metal in kerosene?
Sodium is an extremely reactive metal that catches fire spontaneously if it comes in contact with moisture and oxygen in the air, so it is stored in kerosene to protect it.
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