explain : metals have luster using proper activity
class 10 no wrong answer please
Answers
Answer:
Metals are shiny when cut, scratched, or polished. ... Most metals are also ductile, which means they can be drawn out to make wire. Conductivity: Metals are excellent conductors of electricity and heat. Because they are also ductile, they are ideal for electrical wiring..
Brief procedure:
Activity 3.2 asks us to cut various metals and note the observation.
Observation:
When we cut metals, its newly exposed part has a brilliant shine.
Explanation:
Most metals are highly reactive elements. The outer layer of metals reacts with the atmospheric oxygen to form metal oxides. Metal oxides do not have lustrous property. When we cut the metals using a knife its inner unoxidised layer come into view which shines.
conclusion:
This experiment demonstrates metals have shining property. We use the term lustre for the shining property of the metal. So, metals are lustrous.
Metals, in their pure state, have a shining surface. This property is called metallic lustre.
The metals are generally hard. The hardness varies from metal to metal.
Some metals can be beaten into thin sheets. This property is called malleability. Did you know that gold and silver are the most malleable metals?
The ability of metals to be drawn into thin wires is called ductility. Gold is the most ductile metal
The metals are good conductors of heat and have high melting points. The best conductors of heat are silver and copper. Lead and mercury are comparatively poor conductors of heat.
The metals are good conductors of Electricity