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Melting point: Quiz

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Question 1: Certain materials, such as glass, may harden without crystallizing; these are called ________.
Glass transitionAmorphous solidSilicon dioxideLiquid

Question 2: For example, the melting point and freezing point of the element mercury is 234.32 ________ (−38.83 °C or −37.89 °F).
Rankine scaleKelvinThermodynamic temperatureTemperature

Question 3: The mixing ratio that results in the lowest possible melting point is known as the ________.
Eutectic systemIronGoldMercury (element)

Question 4: Such materials are characterized by a ________ which occurs at a glass transition temperature which may be roughly defined as the "knee" point of the material's density vs.
Glass transitionTransparency and translucencySol-gelOptical fiber

Question 5: The often-cited ________ does not melt at ambient pressure but sublimes at about 4000 K; a liquid phase only exists above pressures of 10 MPa and estimated 4300–4700 K.
AluminiumUraniumOxygenCarbon

Question 6: In organic chemistry Carnelley’s Rule established in 1882 by Thomas Carnelley, states that high ________ is associated with high melting point [6].
Inorganic chemistryMolecular symmetryVSEPR theoryGroup (mathematics)

Question 7: Unlike the ________, the melting point is relatively insensitive to pressure because the solid/liquid transition represents only a small change in volume.
Supercritical fluidCritical point (thermodynamics)Boiling pointPhase transition

Question 8: Likewise in ________ and also dichlorobenzenes the melting point increases in the order meta, ortho and then para.
TolueneTerephthalic acidXyleneEthylbenzene

Question 9: [5] At the other end of the scale, helium does not freeze at all at normal pressure, even at temperatures very close to ________; pressures over 20 times normal atmospheric pressure are necessary.
EntropyCarbonAbsolute zeroThermodynamic temperature

Question 10: The melting point of ________ at 1 atmosphere of pressure is very close [2] to 0 °C (32 °F, 273.15 K), this is also known as the ice point.
Precipitation (meteorology)WaterIceSnow







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