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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.
Which is thicker a 5mm or 7mm pencil lead?
A 7mm pencil lead is thicker than a 5mm pencil lead. The diameter of the lead determines its thickness, so the lead with a larger diameter will be thicker.
What would happen if you scratched a piece of fluorite against a piece of feldspar?
Fluorite is harder than feldspar, so scratching fluorite against feldspar would cause the fluorite to scratch the feldspar. This means the fluorite would leave a mark on the feldspar, showing that fluorite is harder than feldspar.
How hard is thorium?
Thorium is a relatively soft and malleable metal, similar to lead, that can be easily cut with a knife. It has a Mohs hardness rating of 3, which is softer than many common minerals like quartz and feldspar.
Can eating pencil lead kill you in ten years?
If lead pencils were the ONLY thing you ate, it would kill you in a lot less time than that. Pencils do contain some digestible fiber (in the wood), while the graphite "lead" doesn't provide much in the way of nutrition. The "lead" in a pencil is actually not the element lead, which can be toxic; it is graphite, which is powdered carbon. Eating one pencil "lead" is pointless, but harmless.
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.
How can you test if lead in a pencil is harder than lead metal itself?
The 'lead' or graphite in a pencil is softer. Try writing on paper, the pencil will write, the real lead will not
Is a No. 1 pencil harder or softer than a No. 2 pencil?
It's softer. #1 softest, #2 slightly harder, #3 harder than #2, etc.Softer.a #1 pencil is softer than a#2 pencil
Which pencil lead marks the darkest 2B or 6B?
A 6B pencil lead will generally mark darker than a 2B pencil lead. The higher the 'B' number, the softer and darker the lead.
What mineral scratches fluorite but not feldspar?
Quartz scratches fluorite but not feldspar. Fluorite has a relative hardness of 4 on the Mohs scale, while feldspar has a hardness of 6-6.5. Quartz, with a hardness of 7, is harder than fluorite but softer than feldspar, allowing it to scratch fluorite but not feldspar.
Is a 3B pencil darker than a 2B pencil?
Yes, a 3B pencil is darker than a 2B pencil. The higher the number in the pencil grade, the softer the graphite and therefore the darker the mark it will make on paper.
What is softer limestone or granite?
Limestone is softer than granite. Limestone is a sedimentary rock composed mainly of calcium carbonate, which is softer than granite, a type of igneous rock made up of various minerals such as quartz, feldspar, and mica.
Which is thicker a 7mm or 9mm pencil lead?
A 9mm pencil lead is thicker than a 7mm pencil lead.
Which pencil lead is darkest?
The darkness of pencil lead is determined by its graphite-to-clay ratio. The higher the graphite content, the darker the lead. Therefore, a pencil lead labeled as "HB" or "B" will be darker than a lead labeled as "H" or "F." The darkest pencil lead commonly available is typically labeled as "6B" or "8B," indicating a high graphite concentration.
What does the B means on a pencil?
Many pencils across the world and almost all in Europe are graded on the European system using a continuüm from "H" (for hardness) to "B" (for blackness), as well as "F" (for fine point). The standard writing pencil is graded HB.
Can talc scratch feldspar?
No, talc is softer than feldspar on the Mohs scale of mineral hardness. Talc has a hardness of 1 while feldspar has a hardness of 6-6.5, which means that feldspar is resistant to being scratched by talc.
Which is thicker a 5mm or 7mm pencil lead?
A 7mm pencil lead is thicker than a 5mm pencil lead. The diameter of the lead determines its thickness, so the lead with a larger diameter will be thicker.
