4. Materials : Metals And Non-Metals Class 8 Science [LATEST] Solutions Chapter Review in English - CBSE Study
NCERT Solutions for Class 8 Science are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important 4. Materials : Metals And Non-Metals with detailed explanations and step-by-step answers for better exam preparation. Each Chapter Review is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 8 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science.
Class 8 English Medium Science All Chapters:
4. Materials : Metals And Non-Metals
1. Chapter Review
Chapter Review:
- The materials which have the property of hard, malleable, ductile, sonorous and good conductor of heat and electricity. These are called metals.examples: iron, copper, aluminium, calcium, magnesium, etc.
- The property of metals by which they can be beaten into thin sheets is called malleability.
- The property of metal by which it can be drawn into wires is called ductility.
- Metals produce ringing sounds, They are said to be sonorous.
- Some materials are soft and dull and they break down into powdery mass on tapping with hammer. They are not sonorous and are poor conductors of heat and electricity. These materials are called non-metals. Examples: sulphur, carbon, oxygen, phosphorus, etc.
- Metals like sodium and potassium are soft and can be cut with a knife.
- Mercury is the only metal which is found in liquid state at room
temperature. - General, metallic oxides are basic in nature and non-metals oxides are acidic in nature.
- Sodium metal is very reactive. It reacts vigorously with oxygen and
water therefore, stored in kerosene. - Phosphorus is a very reactive non-metal.It catches fire if exposed to air. To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water.
- Metals react with acids and produce metal salts and hydrogen gas that burns with a ‘pop’ sound.
- Metals are used in making machinery,automobiles, aeroplanes, trains, satellites, industrial gadgets, cooking utensils, water boilers, etc.
- Non-metals used in crackers,water purification process and fertilisers to enhance the growth of plants.
- More reactive metals displace less reactive metals from their compounds in aqueous solutions.
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