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Why do metals have to be sandpapered?
The reason why metal have to be clean with sandpaper is to remove the oxide layer on the surface of the metal. This is because most metal have a high tendency toward oxygen. The metal will react with oxygen in the air and form an oxide layer on the surface of the metal.
Why pushing a wooden block across a rough surface will make the bottom of the block feel warm?
Fine sawdust occurs when wood is sandpapered.
Do all metals rust?
Only metals containing iron rust. Other metals, over time, corrode.
What are the most metals on the periodic table?
There are 91 metals in the periodic table today, but new ones are added as time passes.
What different alloy and metal?
metals are existing in nature and these are formed by minerals over a period of time while alloys are combination of different metals.
How did machine guns change over time?
Better metals, ergonomics, projectiles.
Disadvantages of metals?
Metals rust with time if they come in contact with water and air. They can also be very noisy. As metals are generally hard, use of metals requires professional tools. Recycling metals create a lot of toxic gases. For recycling, metals need to be especially separated from other recyclables. Mining also produces lots of noise and air pollution along with the emission of poisonous gases in blast furnaces.
What are the chacteistics of metals?
what are the characteristics of metals? metals? non-metals?
Are Metals and minerals renewable or non-renwable?
Not renewable (metals are generally deposited in nature over geologic time scales, too long to be considered renewable), but many are recycleable.
Most elements are what?
metals
Can gold corrode over time?
Yes, gold can corrode over time, but it is a very slow process compared to other metals.
What metals turn green if exposed to oxygen?
Metals like copper, bronze, and brass can develop a greenish layer known as a patina when exposed to oxygen over time. This greenish layer is typically a result of oxidation and can give these metals a unique and aged appearance.
