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help me pls
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What is the difference between chalk and coal?
Chalk is a soft, sedimentary rock composed primarily of calcium carbonate, used for writing and drawing. Coal is a hard, dark, combustible rock formed from decayed plant matter, used as a fuel source. chalk is used for writing and coal is used for energy production.
What is the chemical in hard water?
The primary chemical in hard water is calcium carbonate, which forms when water comes in contact with minerals like limestone and chalk. Additionally, magnesium salts can also contribute to water hardness.
Why do you need water softening?
there is chalk (CaCo3) in the water, which makes the water "hard"... i.e. if you wash your clothes, the fabric becomes stiff. But adding an agent to the chalky water will "soften" it, this means that the chalk will chemically be removed.
What is a 10 letter word for hard coal that burns at a high temperature?
Anthracite
Why chalk does not dissolve in water?
Chalk is made of calcium carbonate which is insoluble in water. The chemical bonds are to strong. It does dissolve in acids.Many minerals do not dissolve in water.(It would be better to say that many do not dissolve easily, but we are not discussing why it take millions of years to dissolve granite.)In chemistry, one would say that a mineral dissolves readily if it can be broken into parts that become ions and the hydration energy of the ions is larger than the cohesive energy of the constituents in the solid. (More generally, it can be any subunit or whole molecules which are hydrated. Sugar, for instance, dissolves into whole molecules.)There are two kinds of chalk. The mineral Chalk is a porous form of limestone composed of calcium carbonate. Blackboard chalk is calcium sulfate.In both versions of chalk there is low solubility in water and there are some additional details that are interesting if you study chemistry because some forms of the substance are "hydrated" and that is an important aspect in their water chemistry.The bottom line is that things dissolve in water when the water molecule will adhere strongly to the different subunits of the molecules of the solid and it will not dissolve if the adhesion between between particles of the solid is strong enough and that is the case for chalk.
A hard tablet used for writing with chalk?
slate
A hard tablet used for writing on with chalk is called?
Slate
Why is chalk good for writing on hard surfaces?
because it is soft,rough,white and is shown clearly when writing
Why is chalk good for writing on a hard surface?
Chalk is good for writing on a hard surface because it is a soft and powdery substance that can easily adhere to the surface, creating visible marks. It also offers good contrast against dark backgrounds and can easily be erased or smudged off, making it a convenient tool for temporary or quick writing.
What is the difference between chalk and coal?
Chalk is a soft, sedimentary rock composed primarily of calcium carbonate, used for writing and drawing. Coal is a hard, dark, combustible rock formed from decayed plant matter, used as a fuel source. chalk is used for writing and coal is used for energy production.
What is the hardness of chalk?
There are a couple of things that make chalk hard. The calcium in chalk is said to make chalk hard.
1. the chalk is hard.2. wood is____than chalk.3.stonr is the_____among the all?
2.hard 3.harder
Is the rock 'chalk' hard or smooth?
It can be both
How to build a road with chalk?
that would be hard
Is chalk harder than rubber?
Chalk is harder than rubber. Chalk is a form of limestone made of calcium carbonate, which is a relatively hard mineral, whereas rubber is a soft and flexible material typically made from natural or synthetic polymers.
How do you catch shaymin Pokemon diamond?
hold a and b down on the mirror tablet and get oaks letter (whitch is hard) and got bla bla bla get on with it!!!!!!!!! ~ Sorry to bother but what is a mirror tablet? and btw u spelt which wrong
Is the chalk you find in nature the same as the chalk that you use on the board?
No, natural chalk found in nature is formed from the shells of marine organisms, while chalk used on chalkboards is typically made from gypsum or calcium sulfate. The chalkboard chalk is designed to have a smooth texture and be easily erased from chalkboards.
