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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.
Why is powdered chalk more like a liquid than a lump of chalk is?
because it consists of small particles that are similar to liquid. Even if we add water to a powdered chalk, it dissolves easily whereas a lump of chalk is harder to dissolve in water.
1. the chalk is hard.2. wood is____than chalk.3.stonr is the_____among the all?
2.hard 3.harder
Why does an iron nail has more force of attraction than a piece of chalk and rubber band?
Because they have different magnetic properties; iron is strongly ferromagnetic.
Can you use regular chalk to chalk your hair?
yes but you have to soak the chalk more than the pastels
Is chalk harder than rubber?
rubber is harder than chalk !
Is chalk harder than limestone?
No, Limestone is harder than chalk.
What is a form of calcium carbonate softer than marble but harder than chalk?
Limestone is softer than marble, but harder than chalk.
Why can diamonds scratch chalk?
Diamonds are harder than chalk.
Can feldspar be scratched by a nail?
Yes. It is much harder than your fingernail.
Is chalk stronger than clay?
chalk is weaker than clay because of the particles which are migrated inside it. Chalk can float while clay will sink. Clay can also absorb muhc more water No, Clay is stronger than chalk. OF COURSE CHALK IS STRONGER THAN CLAY, HONEY!!! IT IS HARDER AND ABSORBS LESS WATER. Sweetie, why du think clay sinks?
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.
Why is powdered chalk more like a liquid than a lump of chalk is?
because it consists of small particles that are similar to liquid. Even if we add water to a powdered chalk, it dissolves easily whereas a lump of chalk is harder to dissolve in water.
What kind of test is it when you scratch a mineral with a nail?
Most likely you would be testing to see if the mineral was harder or softer than the nail.
Which has more force of attraction an iron nail a piece of chalk and a rubber band?
an iron nail
Why can you use chalk to write on the blackboard but not granite?
Chalk is softer than the slate (real or artificial) used on blackboards, so it will flake off as you write. Granite is harder than slate and will not flake, but rather cut into or mark the slate permanently.
Why are fossils not found in chalk?
Chalk is a fossil itself and chalk is soft, and so while you might form a fossil; in it, it would not remain. Within chalk there is often harder rock - which sometimes does contain fossils.
