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What is a rock that is white and harder than chalk called?
A rock that is white and harder than chalk is likely to be marble. Marble is a metamorphic rock that is formed from limestone under high pressure and heat, making it harder and more durable than chalk, which is a soft sedimentary rock.
Why are there scratches on a wooden ruler when a nail is used to scratch it?
The nail is harder than the wooden ruler, causing the nail to leave scratches on the ruler's surface when it is dragged across it. Wood is a relatively soft material compared to metal, so it is easily marked by harder objects like a nail.
Explain Why blackboards are not scratched by chalk but by the sand embedded in the chalk?
Blackboards are typically made of a material that is softer than chalk, such as slate or porcelain. When you write on a blackboard with chalk, the friction between the chalk and the board causes the chalk to wear down and leave behind tiny particles of sand or abrasive material embedded in the chalk. These abrasive particles then scratch the surface of the blackboard as you write, creating marks that can be difficult to erase.
If an iron nail is harder than gypsum and softer than calciteapproximately what hardness might it rate?
An iron nail typically has a hardness of around 4 to 5 on the Mohs scale. Gypsum rates at about 2, while calcite is around 3. Therefore, since the iron nail is harder than gypsum and softer than calcite, it would likely rate closer to 4.
Can fluorite be scratched by a steel nail?
Yes. A steel nail has a Mohs hardness greater than that of fluorite.
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.
Is chalk harder than limestone?
No, limestone is harder than chalk. Limestone is a sedimentary rock composed mainly of calcite, whereas chalk is a soft, porous sedimentary rock composed mainly of calcium carbonate.
Why can diamonds scratch chalk?
Diamonds are harder than chalk.
What is a rock that is white and harder than chalk called?
A rock that is white and harder than chalk is likely to be marble. Marble is a metamorphic rock that is formed from limestone under high pressure and heat, making it harder and more durable than chalk, which is a soft sedimentary rock.
What is a form of calcium carbonate softer than marble but harder than chalk?
Limestone is a form of calcium carbonate that is softer than marble but harder than chalk. It is commonly used in construction materials and can be found in different shades depending on the mineral impurities present.
Can feldspar be scratched by a nail?
Yes. It is much harder than your fingernail.
Is chalk softer than a pencil lead?
Chalk is generally softer than pencil lead. Chalk is made of the mineral calcite, which is relatively soft, while pencil lead is made of graphite, which is harder.
Can sulfur get scratched by a nail?
No, sulfur is harder than a nail so it cannot be scratched by a nail. Nails are typically made of iron, which is softer than sulfur. Therefore, if a nail comes into contact with sulfur, the nail is more likely to scratch than the sulfur.
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.
Why are there scratches on a wooden ruler when a nail is used to scratch it?
The nail is harder than the wooden ruler, causing the nail to leave scratches on the ruler's surface when it is dragged across it. Wood is a relatively soft material compared to metal, so it is easily marked by harder objects like a nail.
Explain Why blackboards are not scratched by chalk but by the sand embedded in the chalk?
Blackboards are typically made of a material that is softer than chalk, such as slate or porcelain. When you write on a blackboard with chalk, the friction between the chalk and the board causes the chalk to wear down and leave behind tiny particles of sand or abrasive material embedded in the chalk. These abrasive particles then scratch the surface of the blackboard as you write, creating marks that can be difficult to erase.
If an iron nail is harder than gypsum and softer than calciteapproximately what hardness might it rate?
An iron nail typically has a hardness of around 4 to 5 on the Mohs scale. Gypsum rates at about 2, while calcite is around 3. Therefore, since the iron nail is harder than gypsum and softer than calcite, it would likely rate closer to 4.
