Which part of Earth is made of rock that is close to its melting point?
yes! its the Asthenosphere :D
Why do electric plug do not get melted after even the wires present inside them get melted due to overheating?
There are two types of chalk, calcium sulfate and calcium carbonate. The natural occurring sedimentary rock called chalk is a form of limestone made of the compound calcium carbonate. One of the crystal forms is calcite, which the melting point is 1,339 °C (2,442 °F; 1,612 K). The melting point of a second crystal form, aragonite, is 825 °C (1517 °F; 1,098 K). Blackboard chalk is made of calcium sulfate, also known as gypsum. The…
Three test tubes labeled A B and C contain substances with approximately the same melting point How could you prove the test tubes contain three different chemical compounds?
If a mixture of A+B, A+C, or B+C is made, a depression of melting point will prove whether or not two compounds having the same melting points are identical. If the two substances in the mixture are identical, the mixture will have the same melting point. If the two substances in the mixture are different, the mixture will have a reduced melting point.
Most commonly: purity. If I synthesize something in the lab, I might want to check I've made the right stuff. I could run an NMR or Mass spec but a quicker check would be melting point. If it matches the known melting point for that compound, chances are I've got the right stuff. Melting point is, in fact, VERY accurate when used in this way and measured correctly. Most compounds have rather unique melting points…
Alloys are used rather than pure metals in electrical heating devices since they have low electrical conductivity and also a low melting point. Usually the alloys don't have a single melting point; they have a range of melting points. The temperature at which melting begins is called the SOLIDUS and the temperature at which melting is complete is called the LIQUIDUS.