480 ViewsSIMPLE MACHINE  Definition of Simple Machine A machine is a tool or device that makes work easier. It is…

873 ViewsOXYGEN (O2) PROPERTIES AND USES   Oxygen (O2) is an active, life-sustaining component of the atmosphere; making up 20% by…

543 ViewsRUSTING OF IRON Corrosion The eating up of metals by the action of air and moisture on their surface…

546 ViewsWATER AND HYDROGEN Hydrogen is the simplest element. It is the first element in the periodic table, and it…

402 ViewsAIR AND COMBUSTION Percentage of Oxygen in Air We have read that Air consists mainly of molecules of oxygen…

312 ViewsINDICATORS Red cabbage juice solution works well instead of universal indicator solution. Making Cabbage Indicator Acid base indicators are…

401 ViewsAN ALKALI Alkali is pronounced like alcohol, with ‘lie’ at the end instead of ‘hol’. An alkali is any…

627 ViewsACIDS, BASES AND INDICATORS   Introduction  All the elements in nature fall into three classes: metals, non-metals and gases. Non-metals…

333 ViewsCOMPOUNDS AND FORMULA  A compound is a pure substance formed by chemically combining at least two different elements. Compounds…

378 ViewsCONSTITUENTS OF MATTER   Atoms, Molecules, Elements and Compounds The Atom An atom is the smallest particle of a substance which…