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Explain why blackboards are not scratched by chalk but are scratched by the sand embedded in the chalk?
The hardness of sand is higher.
Explain Why blackboards are not scratched by chalk but by the sand embedded in the chalk?
Blackboards are not scratched by chalk because chalk is softer than the material from which the blackboard is constructed. Sand scratches blackboards because it is harder than the material from which a blackboard is made.
How do you separate a mixture of sand salt chalk dust and amp iron filings.?
First remove iron filings with a magnet. That leaves sand, salt and chalk dust. Add water which dissolves the salt, and filter leaving the sand and chalk dust on the filter paper. Put that back in water and add acid to dissolve the chalk dust (CaCO3) leaving the sand as a solid. Filter to obtain the sand. The chalk dust will now be in the acid as CO2 and H2O and the Ca salt of the acid.
How do you separate sand and chalk?
Sand and chalk can be separated through the centrifugal process. A centrifuge makes high speed cycles and the materials of different densities will be separated.
What is made when sand becomes embedded in the oyster's mantle?
a pearl
What does chalk look like when you crush it?
SANDie Well it will be like sand, or it could be a powder. If it is a blue kind of chalk, when you crush the blue chalk, it will be blue. Sometimes, it could be a nice smooth powder. Sometimes, it could be into pieces instead. You have to crush it more to make it like sand or powder. But sand has rocks and hard ones. So this might be powder.
What happens when you put chalk into water?
If you put a piece of chalk in water, don't expect much to happen. The chalk, which is calcium carbonate (CaCO3), will displace some water and sink. It will grow in mass by a small amount since it is permeable and is absorbing the water.
How can you repair a scratched rim?
It can be done using sand paper and smoothing it, but its best to go to a pro.
What material are used to make rangoli patterns?
flower petals, paint, pebbles, sand, rice and chalk.
What is the difference between limestone and chalk?
they are both rocks but both formed different ways chalk is formed by dead sea creatures skeleltons build up to form chalk and limestone is formed by shells and very littke amounts of mud and sand
What are the natural resources of Denmark?
Petroleum, natural gas, fish, salt, limestone, chalk, stone, gravel and sand.
What was the first ball ever made of?
At first the tennis balls were made of leather stuffed with chalk, sand and wool.
