Question

! 2. Write down the laboratory acids and bases in
the given table and identify the metal and non-
metal present in them, which forms oxides​

Answer 1

Answer:

Explanation:

Metals and Non-metals

Metals can be distinguished from non-metals on the basis of their physical and chemical properties. Recall that lustre and hardness are physical properties.You are familiar with a number of materials like iron, aluminium, copper, etc. Some materials have been given in Table. Metals are used in making machinery, automobiles, aeroplanes, buildings, trains, satellites, gadgets, cooking utensils, water boilers, etc.

Appearance and Hardness of materials

Object /Material Appearance Hardness

Iron Shiny Very hard  

Coal Dull Not very hard

Sulphur Dull Not very hard

Aluminium Shiny Very hard

Copper Shiny Very hard                                                                             Physical Properties of Metals and Non-metals

Take a small iron nail, a coal piece, a piece of thick aluminium wire and a pencil lead. Beat the iron nail with a hammer. (But take care that you don’t hurt yourself in the process). Try to hit hard. Hit hard also the aluminium wire. Then repeat the same kind of treatment on the coal piece and pencil lead. Record your observations in a Table.

The shape of the iron nail and the aluminium wire changed on beating. If they were beaten harder these could be changed into sheets. Silver foil is used for decorating sweets and Aluminium foil used for wrapping food. The property of metals by which they can be beaten into thin sheets is called malleability. This is a characteristic property of metals. As you must have noticed, materials like coal and pencil lead do not show this property.