Chemical Elements: Melting Points Flashcards
Recall each element's melting points to two decimal places.
Give the melting point.
(Values rounded to 4sf)
−259.2°C
−434.5°F ; 13.99 K
The melting point is the temperature at which the solid and liquid forms of a substance can exist in equilibrium.
Give the melting point.
(Values rounded to 4sf)
Unknown
Under 1 atm, it is believed helium will remain a liquid down to absolute zero.
Give the melting point.
(Values rounded to 4sf)
180.5°C
356.9°F ; 453.7 K
Applying heat to a solid will increase its temperature right up to its melting point.
Once this is reached, additional heat will not change the temperature but instead go into providing energy to overcome the forces of attraction between the solid particles, allowing it to transition to the liquid phase.
Give the melting point.
(Values rounded to 4sf)
1287°C
2349°F ; 1560 K
Extra for Experts: only solids and gases exist in space because the pressure is zero and any liquid exposed would immediately boil or freeze.
Remember that pressure affects boiling points, as the vapour pressure of the liquid is at equilibrium with the surrounding pressure – liquids cannot stably exist in a zero-pressure environment (i.e. a vacuum).
Give the melting point.
(Values rounded to 4sf)
2077°C
3771°F ; 2350 K
The melting point is the temperature at which the solid and liquid forms of a substance can exist in equilibrium.
Give the sublimation point.
(Values rounded to 4sf)
3825°C
6917°F ; 4098 K
Note there are theoretical values for melting and boiling points of carbon, however, in real life contexts, carbon actually sublimes (goes from solid to gas, skipping the liquid phase).
Give the melting point.
(Values rounded to 4sf)
−209.9°C
−345.8°F ; 63.29 K
The melting point of a substance is less dependent on pressure than the boiling point, but this is still an important factor affecting it.
This relationship though is not always as straightforward, and with some instances increased pressure after a certain point translates to a decrease in melting point.
Give the melting point.
(Values rounded to 4sf)
−218.8°C
−361.8°F ; 54.36 K
The melting point is the temperature at which the solid and liquid forms of a substance can exist in equilibrium.
Give the melting point.
(Values rounded to 4sf)
−219.7°C
−363.4°F ; 53.48 K
The melting point is less dependent on pressure than the boiling point, but this is still an important factor affecting it.
This relationship though is not always as straightforward, and with some instances increased pressure after a certain point translates to a decrease in melting point.
Give the melting point.
(Values rounded to 4sf)
−248.6°C
−415.5°F ; 24.56 K
Applying heat to a solid will increase its temperature right up to its melting point.
Once this is reached, additional heat will not change the temperature but instead go into providing energy to overcome the forces of attraction between the solid particles, allowing it to transition to the liquid phase.
Give the melting point.
(Values rounded to 4sf)
97.79°C
208.0°F ; 370.94 K
Phase diagrams are charts used to depict the conditions (pressure and temperature mostly) at which thermodynamically distinct phases (i.e. solid, liquid, gas) occur or exist at equilibrium with each other.
The line representing the equilibrium between solid and liquid for sodium would intersect the coordinate (97.79°C , 1 atm).
Give the melting point.
(Values rounded to 4sf)
650°C
1202°F ; 923.2 K
The stronger the bonding between particles in a substance, the more energy is required to overcome these forces of attraction, and therefore it will have a higher melting point.
Give the melting point.
(Values rounded to 4sf)
660.3°C
1221°F ; 933.5 K
The heat of fusion (enthalpy of fusion) is the energy absorbed by a unit mass of a particular solid once it’s reached its melting point in order for it to convert fully from a solid to a liquid, without a change in its temperature.
This also goes in the opposite direction, with it representing the amount of energy needed to be released for the substance to solidify again.
Give the melting point.
(Values rounded to 4sf)
1414°C
2577°F ; 1687 K
Melting is a physical change rather than a chemical one, as this process is easily reversible and does not form a new substance, nor involve the transfer of electrons.
Give the melting point.
(Values rounded to 4sf)
44.15°C
111.5°F ; 317.3 K
The melting point is the temperature at which the solid and liquid forms of a substance can exist in equilibrium.
Give the melting point.
(Values rounded to 4sf)
115.2°C
239.4°F ; 388.4 K
The melting point is less dependent on pressure than the boiling point, but this is still an important factor affecting it.
This relationship though is not always as straightforward, and with some instances increased pressure after a certain point translates to a decrease in melting point.
Give the melting point.
(Values rounded to 4sf)
−101.5°C
−150.7°F ; 171.7 K
Applying heat to a solid will increase its temperature right up to its melting point.
Once this is reached, additional heat will not change the temperature but instead go into providing energy to overcome the forces of attraction between the solid particles, allowing it to transition to the liquid phase.
Give the melting point.
(Values rounded to 4sf)
−189.3°C
−308.8°F ; 83.81 K
The weaker the bonding between particles in a substance, the less energy is required to overcome these forces of attraction, and therefore it will have a lower melting point.
Give the melting point.
(Values rounded to 4sf)
63.50°C
146.30°F ; 336.7 K
Phase diagrams are charts used to depict the conditions (pressure and temperature mostly) at which thermodynamically distinct phases (i.e. solid, liquid, gas) occur or exist at equilibrium with each other.
The line representing the equilibrium between solid and liquid for potassium would intersect the coordinate (63.50°C , 1 atm).
Give the melting point.
(Values rounded to 4sf)
842.0°C
1548°F ; 1115 K
Calcium has a relatively high melting point, making it a solid at room temperature.
Give the melting point.
(Values rounded to 4sf)
1541°C
2806°F ; 1814 K
Scandium has a relatively high melting point, easily making it a solid at room temperature.
Give the melting point.
(Values rounded to 4sf)
1670°C
3038°F ; 1943 K
The heat of fusion (enthalpy of fusion) is the energy absorbed by a unit mass of a particular solid once it’s reached its melting point in order for it to convert fully into a liquid, without a change in its temperature.
This also goes in the opposite direction, with it representing the amount of energy needed to be released for the substance to solidify again.
Give the melting point.
(Values rounded to 4sf)
1910°C
3470°F ; 2183 K
Adding solutes or other substances can change the melting point, such as the case with alloys of varying elements and compositions.
Give the melting point.
(Values rounded to 4sf)
1907°C
3465°F ; 2180 K
Alloys tend to have lower melting points than pure metals as the differing sizes of the atoms and their less regular arrangements leads to weaker bonding between them.
For example, a chromium cobalt alloy has a theoretical melting point of around 1330°C - although this of course varies with compositions of each element.
Give the melting point.
(Values rounded to 4sf)
1246°C
2275°F ; 1519 K
The melting point is the temperature at which the solid and liquid forms of a substance can exist in equilibrium.
Give the melting point.
(Values rounded to 4sf)
1538°C
2800°F ; 1811 K
The melting point is less dependent on pressure than the boiling point, but this is still an important factor affecting it.
This relationship though is not always as straightforward, and with some instances increased pressure after a certain point translates to a decrease in melting point.
Give the melting point.
(Values rounded to 4sf)
1495°C
2723°F ; 1768 K
Applying heat to a solid will increase its temperature right up to its melting point.
Once this is reached, additional heat will not change the temperature but instead go into providing energy to overcome the forces of attraction between the solid particles, allowing it to transition to the liquid phase.
Give the melting point.
(Values rounded to 4sf)
1455°C
2651°F ; 1728 K
The stronger the bonding between particles in a substance, the more energy is required to overcome these forces of attraction, and therefore it will have a higher melting point.
Give the melting point.
(Values rounded to 4sf)
1084°C
1984°F ; 1358 K
Extra for Experts: The critical point on a phase diagram represents a temperature and pressure value at which the liquid and gaseous phases merge together to form a single phase.
This is found towards the top-right of a traditional phase diagram, and represents supercritical fluids.
Give the melting point.
(Values rounded to 4sf)
419.5°C
787.1°F ; 692.7 K
Zinc has a relatively low melting point compared to other transition metals of the same period.
Give the melting point.
(Values rounded to 4sf)
29.76°C
85.58°F ; 302.91 K
Gallium has a low melting point, just above room temperature, which allows it to melt in your hand.
Give the melting point.
(Values rounded to 4sf)
938.3°C
1721°F ; 1211 K
The heat of fusion (enthalpy of fusion) is the energy absorbed by a unit mass of a particular solid once it’s reached its melting point in order for it to convert fully into a liquid, without a change in its temperature.
This also goes in the opposite direction, with it representing the amount of energy needed to be released for the substance to solidify again.
Give the melting point.
(Values rounded to 4sf)
816.8°C
1502°F ; 1090 K
Note that arsenic will only melt under non-standard pressure conditions (28 atmospheres), and would otherwise sublime at a temperature lower than this.
Give the melting point.
(Values rounded to 4sf)
220.8°C
429.4°F ; 494.0 K
Selenium has a relatively low melting point, but is still easily a solid under standard conditions.
It would however be turned to a liquid on the surface of Venus (~464°C)!
Give the melting point.
(Values rounded to 4sf)
−7.200°C
19.04°F ; 266.0 K
Bromine has a relatively low melting point, making it a liquid at room temperature.
Give the melting point.
(Values rounded to 4sf)
−157.4°C
−251.3°F ; 115.8 K
Krypton’s melting point is only a few degrees less than its boiling point (−153.4°C).
Give the melting point.
(Values rounded to 4sf)
39.30°C
102.7°F ; 312.5 K
Rubidium has a low melting point, just above room temperature.
Alkali metals have lower melting and boiling points because of the wider interatomic distances in their crystal structures, meaning their bond energy is lower than other metals and easier to overcome with less heat needing to be applied.
Give the melting point.
(Values rounded to 4sf)
777.0°C
1431°F ; 1050 K
The melting point is the temperature at which the solid and liquid forms of a substance can exist in equilibrium.
Give the melting point.
(Values rounded to 4sf)
1522°C
2772°F ; 1795 K
The melting point is less dependent on pressure than the boiling point, but this is still an important factor affecting it.
This relationship though is not always as straightforward, and with some instances increased pressure after a certain point translates to a decrease in melting point.
Give the melting point.
(Values rounded to 4sf)
1854°C
3369°F ; 2127 K
The stronger the bonding between particles in a substance, the more energy is required to overcome these forces of attraction, and therefore it will have a higher melting point.
Give the melting point.
(Values rounded to 4sf)
2477°C
4491°F ; 2750 K
Extra for Experts: Phase diagrams are charts used to depict the conditions (pressure and temperature mostly) at which thermodynamically distinct phases (i.e. solid, liquid, gas) occur or exist at equilibrium with each other.
The line representing the equilibrium between solid and liquid for niobium would intersect the coordinate (2477°C , 1 atm).
Give the melting point.
(Values rounded to 4sf)
2622°C
4752°F ; 2895 K
Extra for Experts: On a phase diagram, the triple point represents where all lines of equilibrium between phases intersect.
This is the exact temperature and pressure at which a substance can stably exist as a solid, liquid, and gas in equilibrium.
Give the melting point.
(Values rounded to 4sf)
2157°C
3915°F ; 2430 K
The heat of fusion (enthalpy of fusion) is the energy absorbed by a unit mass of a particular solid once it’s reached its melting point in order for it to convert fully into a liquid, without a change in its temperature.
This also goes in the opposite direction, with it representing the amount of energy needed to be released for the substance to solidify again.
Give the melting point.
(Values rounded to 4sf)
2333°C
4231°F ; 2606 K
Alloys tend to have lower melting points than pure metals as the differing sizes of the atoms and their less regular arrangements leads to weaker bonding between them.
Give the melting point.
(Values rounded to 4sf)
1963°C
3565°F ; 2236 K
The melting point is the temperature at which the solid and liquid forms of a substance can exist in equilibrium.
Give the melting point.
(Values rounded to 4sf)
1555°C
2,831°F ; 1828 K
The melting point is less dependent on pressure than the boiling point, but this is still an important factor affecting it.
This relationship though is not always as straightforward, and with some instances increased pressure after a certain point translates to a decrease in melting point.
Give the melting point.
(Values rounded to 4sf)
961.8°C
1763°F ; 1235 K
Applying heat to a solid will increase its temperature right up to its melting point - note that this value for silver is relatively low.
Once this is reached, additional heat will not change the temperature but instead go into providing energy to overcome the forces of attraction between the solid particles, allowing it to transition to the liquid phase.