The melting point of a solid is the temperature at which it changes state from solid to liquid.

learn more… | top users | synonyms

2
votes
1answer
34 views

Liquifying metal and toxic fume exposure

I just read a very entertaining Youtube comment thread on a video where TheBackyardScientist melts tin on the stove in his (enclosed) kitchen, the proceeds to cook a steak on it. According to the ...
0
votes
0answers
35 views

What is the melting point of glycerol in a vacuum?

Can anyone tell me what the melting point of glycerin would be in a vacuum? From researching online (disclaimer: I'm definitely not a chemist) it seems the boiling point is ~170 °C in a vacuum (vs. ...
0
votes
0answers
52 views

How do covalent crystals melt?

A network solid, like diamond or silicon dioxide, has a lattice of covalent bonds that make up a giant structure. Normally when you melt a simple molecular substance, you are breaking the inter ...
0
votes
0answers
46 views

Melting point-general chemistry

This one has stumped me for a few days. What is the specific name of the general chemistry principle that is responsible for the difference in melting points of pure and impure solids. I have ...
3
votes
1answer
58 views

How does ice melt?

I know that when water freezes, it forms a crystalline structure created by the hydrogen bonds between polar water molecules. Also, I know that during a phase change, the potential energy of the ...
1
vote
1answer
24 views

Would a melted crystal recrystallize back into the same lattice structure when frozen?

Two things that I'm not sure about melted crystals: For a material that has only one possible crystal structure, would freezing cause it to recrystallize, or could it become amorphous upon freezing? ...
3
votes
3answers
106 views

Sodium chloride and melting of the ice

My question is this, In European countries, they use NaCl or KCl to melt ice during the winter season. In Asian Countries, they use NaCl to keep the ice without melting. (Ex- Ice cream boxes, Beer ...
3
votes
0answers
36 views

Is it possible, given a target temperature, to create an alloy that melts at precisely that temperature?

Assuming the target melting points are between the melting points of mercury and tungsten, is it possible, given a target temperature, to create an alloy (or compound) composition that has a direct ...
3
votes
1answer
51 views

Why does the boiling and melting point decrease as you go down group 1 and vice versa for group 7?

I used to think that because an alkali metal needs to lose one electron to complete its outer shell, when the atom increases in size (atomic radius), the electron would be easier to lose as the ...
5
votes
2answers
108 views

At what temperature (in kelvin) are most of the elements on the periodic table liquids?

This question is out of pure curiosity. At what temperature are a majority of the elements on the periodic table in a liquid state/phase of matter? For the purpose of this question, assume the ...
0
votes
1answer
26 views

How to create liquid carbon, and what kinds of properties does it have? [duplicate]

Carbon sublimes at about 3915K. In a high pressure environment, shouldn't it be possible to create liquid carbon at high temperatures? Has this ever been done? What does it look like and what ...
-1
votes
1answer
36 views

Why there is a non-linear trend on the melting points for period 2 elements, especially Na to Si?

Using the knowledge of periodicity from high school cannot explain this, what it tells me is just metallic bonding. The model of delocalised electron from a metallic lattice can explain the increase ...
0
votes
1answer
74 views

Why do the melting points of Group 15 elements increase upto Arsenic but then decrease upto Bismuth?

The boiling points of group 15 elements increase on going down the group (or, as size increases) but the same is not true for the melting points. The melting points increase from $\ce{N}$ to $\ce{As}$ ...
0
votes
0answers
58 views

Why does melting point depend on external pressure?

The melting point of a substance is the temperature at which the solid form's vapor pressure equals the liquid form's vapor pressure. I read that the vapor pressure of something depends ONLY on the ...
2
votes
2answers
149 views

Melting points of NaCl and RbCl

Why is the melting point of $\ce{NaCl}$ more than that of $\ce{RbCl}$ ? Using Fajan's Rule of polarizing power, $\ce{RbCl}$ has more ionic character and thus should have a higher melting point.
1
vote
0answers
44 views

Why are the melting points of Sb and Bi lower than that of As?

My book says it has something to do with the inert pair effect. And unlike As, Sb and Bi tend to form 3 covalent bonds rather than 5. I don't understand what's really going on here.
1
vote
1answer
43 views

Can I melt Barium Titanate powder into a cylinder and preserve the high dielectric?

I would like to make various solid forms of Barium Titanate e.g. cylinders, discs. Barium Titanate powder seems widely available and has a melting point of 1,625'C. Can I melt it in an iron forge ...
2
votes
1answer
167 views

Why is Iodine's melting point is lower than water?

My teacher told us that melting point of Iodine is lower than Ice as it is a Simple molecular structure bonded by weak van der waals forces. However I gooogle and found out its melting point is ...
-1
votes
1answer
43 views

What is the melting point of HfS2, HfSe2, ZrS2, ZrSe2?

I am currently working on these materials ($\ce{HfS2, HfSe2, ZrS2, ZrSe2}$) and I need to know the melting temperatures of these compounds before starting my work. Has anybody found the melting ...
0
votes
1answer
113 views

How to calculate the boiling point of a solid substance?

Say that I have a solid substance; I know its density, mass, volume, melting point, specific heat, the pressure which it is under, and nothing else. (for now.) How do I find the heat at which it ...
-1
votes
1answer
43 views

Can you call a table frozen?

Someone has argued that the table sitting in front of us is 'frozen'. I do agree that the table has a freezing point. The table has a melting point, but that is beyond the ignition point and the ...
1
vote
0answers
212 views

Why there is an exception in melting and boiling point in p block?

Why is the boiling point and melting point of 15th group and 16th group has an exception? As we know that as molecular mass increases boiling point and melting point will also increase. So on going ...
4
votes
1answer
97 views

Changes in freezing point of sodium acetate

Background: I was recently playing around with some reusable heat packs, the kind that operate by phase change of sodium acetate trihydrate and noticed that they didn't reach the temperature that I ...
1
vote
2answers
55 views

Experimental melting-point of Arm-and-Hammer sodium bicarbonate is remarkably high(?)

Online literature reports the melting point of $\ce{NaHCO3}$ as ~50 deg. C. Using a standard Mel-Temp II melting-point apparatus and a standard alcohol thermometer, I didn't observe any melting of ...
22
votes
2answers
4k views

What happens if you cool water in a container too small for it to freeze?

Freezing a full bottle of water tends to shatter the glass bottle. What if you used something tougher than glass, like diamond? What would happen if you kept dropping the temperature, but restrained ...
0
votes
0answers
133 views

Why do ionic compounds have higher melting and boiling points despite having smaller radii?

Why do ionic compounds have higher melting and boiling points despite having smaller radii? I thought that the closer the two ions are, the larger the repulsive force, and therefore it should rather ...
6
votes
0answers
45 views

Seeking titanium compound, melting point <1600 °C, decomposes to TiO

The title says it all. I’m new to glass making, and I need a titanium compound that will render me $\ce{TiO}$ through decomposition, and has a melting point under 1600 °C. Hopefully I can get one ...
3
votes
1answer
227 views

Boiling/melting points of cyclohexane and cycloheptane

I’m looking at a chart in my book, and while cycloheptane has a higher boiling point than cyclohexane like I’d expect, cycloheptane has a melting point of −12 °C, while cyclohexane has a melting point ...
16
votes
5answers
2k views

Which substance has the highest temperature range between melting and boiling point

Which substances exist that are normally liquid and that will not freeze nor boil even at relatively low/high temperatures as compared to the freezing and boiling points of water? Or how can I ...
2
votes
1answer
2k views

The effect of air pressure on the “melting point”?

a) No effect b) The melting point increases when the air pressure increases c) The melting point decreases When the air pressure increases The boiling point has inverse relation with ...
6
votes
1answer
108 views

At the eutectic point,what is effect of adding impurity on the melting point?

a) Increase the melting point b) Decrease the melting point c) No effect on melting point It was a question in the test I passed today. I know adding impurity decreases the melting point of a ...
6
votes
1answer
74 views

Are there compounds that melt under their own weight?

Is there a compound that can melt under its own weight? That is, a block of such material remains solid when put horizontally but starts to melt when put vertically or remains solid in microgravity, ...
4
votes
1answer
1k views

Why does magnesium have an exceptionally low melting point?

Why does magnesium have a lower melting point than both calcium and beryllium? It does not seem to fit into the group trend.
11
votes
2answers
211 views

Why is the melting point of p-toluenesulfonic acid monohydrate higher than that of anhydrous p-toluenesulfonic acid?

Why is the melting point of p-toluenesulfonic acid monohydrate higher than that of anhydrous p-toluenesulfonic acid? Compare for example the melting point of benzenesulfonic acid hydrate, which is ...
5
votes
2answers
147 views

Predicting melting points of substances based on their molecular/atomic structure

Wouldn't it be great to be able to predict the melting point of a metal based on the atomic number and not by looking in some table for the value that was measured experimentally by someone else? Or ...
6
votes
1answer
470 views

Can you melt wood?

We talked about it in our chemistry class but we couldn't get to a conclusion, any help?
-1
votes
1answer
67 views

Why/How am I calculating freezing point depression wrong?

What is the freezing point of water made by dissolving $\mathrm{10.11~g}$ of magnesium chloride in $\mathrm{86.03~g}$ of water? The freezing-point depression constant of water is ...
0
votes
0answers
19 views

Boiling point and melting point of dihalobenzene compounds [duplicate]

In Dichlorobenzene what explains the boiling and melting point of the 3 structures that can be formed? According to Google The melting point decreases in the order- Para>Ortho>Meta And Boiling ...
2
votes
0answers
151 views

Household Melting Point Standards

I'd like to accurately calibrate a digital thermometer I'm building in the range $50^\circ$ to $120^\circ$ Celsius. I'm aware that one can buy various chemicals that have melting points in this ...
2
votes
1answer
101 views

Why does the mixture's temperature change while phase transition?

Consider a mixture made up of alcohol and water at room temperature. If I freeze this mixture, why does it change its temperature during the phase change? I don't understand the difference between ...
2
votes
1answer
231 views

Molecular weight determination from freezing point depression

I have these two questions in my lab manual and I don't know how to approach them. Which is the better solvent for molar mass determinations by freezing point depression, benzene or cyclohexane? ...
2
votes
0answers
163 views

What determines an element’s melting point?

When looking through the periodic table of elements I realized a massive range in the melting and boiling points of the various metals and it seemed to have nothing to do with its elemental number, ...
2
votes
1answer
121 views

How do we predict the order of melting points of group 1 and group 2 halides?

I get really confused by this: The order of melting points of group 2 chlorides is: $$\ce{BaCl2 > SrCl2 > CaCl2 > MgCl2 > BeCl2}$$ This is completely understandable by Fajan's Rules. ...
3
votes
0answers
106 views

Why does magnesium have the lowest melting point of all earth alkalis?

Why does magnesium have the lowest melting point of all earth alkali metals?
1
vote
2answers
236 views

how to separate gamma-butyrolactone from N-methyl-2-pyrrolidone

Since these two chemicals have different freezing temps (pyrrolidone is $-11~\mathrm{^\circ F}$ [$-24~\mathrm{^\circ C}$] and $\unicode[Times]{x3b3}$-butyrolactone freezes (also called melting) at ...
2
votes
1answer
915 views

Lowest freezing point room temperature liquid?

What substance that is liquid at STP has the lowest freezing/melting point? I think it's either 2-methylpentane or 3-methylpentane, but I get different numbers from different sources.
5
votes
1answer
4k views

Boiling and melting point of trans- and cis-but-2-ene

The boiling point of trans-but-2-ene is lower than that of its cis isomer but the melting point of the former is higher than the later. Why is it not following the same order? Is there any factor of ...
0
votes
2answers
186 views

How to rationalise the difference in the melting points of acids and alcohols with inter molecular forces?

Acids: arachidic acid, palmitic acid, lauric acid, etc. Alcohols: butan-1-ol, pentan-1-ol, etc. The melting points of acids with $\ce{-COOH}$ at the end compared to melting points of alcohols, ...
5
votes
2answers
120 views

Can powdered beta-tin be made from raising the temperature of alpha-tin?

When white tin ($\beta$-tin) is cooled to a temperature below $13.2\ \mathrm{^\circ C}$, it creates the allotrope of gray ($\alpha$-tin), a gray, amorphous powder. My question is that once you have ...
2
votes
1answer
983 views

How to RAISE the melting point of water?

It is common that adding common salt into water will lower its melting point. But, is there any way to RAISE the melting point of water? Does it lower the boiling point of water as well? Why?