Danh mục: Chapter 3

  • Corrosion

    Chapter 3. Metals and Non-metals 3.5. Corrosion You have learnt the following about corrosion in Chapter 1 –Silver articles become black after some time when exposed to air. This is because it reacts with sulphur in the air to form a coating of silver sulphide. Copper reacts with moist carbon dioxide in the air and […]

  • Occurrence Of Metals

    Chapter 3. Metals and Non-metals 3.4. Occurrence Of Metals The earth’s crust is the major source of metals. Seawater also contains some soluble salts such as sodium chloride, magnesium chloride, etc.The elements or compounds, which occur naturally in the earth’s crust, are known as minerals. At some places, minerals contain a very high percentage of […]

  • How Do Metals And Non-Metals React?

    Chapter 3. Metals and Non-metals 3.3. How Do Metals And Non-Metals React? In the above activities, you saw the reactions of metals with a number of reagents. Why do metals react in this manner? Let us recall what we learnt about the electronic configuration of elements in Class IX. We learnt that noble gases, which […]

  • Chemical Properties Of Metals

    Chapter 3. Metals and Non-metals 3.2. Chemical Properties Of Metals We will learn about the chemical properties of metals in the following Sections 3.2.1 to 3.2.4. For this, collect the samples of following metals – aluminium, copper, iron, lead, magnesium, zinc and sodium. 3.2.1. What happens when Metals are burnt in Air? You have seen […]

  • Physical Properties

    Chapter 3. Metals and Non-metals In Class IX you have lear that elements can be classified as metals or non-metals on the basis of nt about various elements. You have seen their properties. Think of some uses of metals and non-metals in your daily life. What properties did you think of while categorising elements as […]

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