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becausethere is stong bonding between na and cl due to difference of electronegativity.
EDIT:
This difference in electronegativity creates a polar bond. Because there is a greater difference in elecronegativity in NaCl than NaBr, the bond is more polar in NaCl. Therefore, the permanent dipole-permanent dipole bonds (strongest intermolecular bonds formed in both situations) are stronger in NaCl, so more energy is required to break these bonds and so melt the salt.
You may think that the melting point would be higher in NaBr because Br has more electrons, so NaBr would form stronger instantaneous dipole-induced dipole bonds. Although this is true, permanent dipole-permanent dipole bonds are stronger than instantaneous dipole-induced dipole bonds, so are more important when considering intermolecular bonding and melting points.
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Which element has a higher melting point potassium or calcium?
Calcium at 860 degrees celsius potassium melts at a mere 65 degrees celsius
What is the difference melting point of sodium iodide and naphthalene?
NaI has ions and has strong electrostatic force of attraction, hence high melting point. Naphthalene has weak van der Waals forces of attraction between the molecules and hence have low melting point.
Is magnesium sulphate's melting point above room temperature?
Magnesium sulfate doesn't melt; at high temperature MgSO4 is thermally decomposed.
Why is the boiling point of NaCl higher than sucrose?
Nacl is a salt and forms ions in the solution Na+ Cl- , in other words it has 2 molecules dissociated. On the other hand Sucrose does not dissociate it stays as one mole of sugar. This is why the boiling point of Nacl is higher then Sucrose.
Why does benzene have a lower boiling point but a much higher melting point than toluene?
Benzene has a lower boiling point than toluene because it has a symmetric structure that experiences weaker van der Waals forces, making it easier for benzene molecules to separate and vaporize. The higher melting point of benzene compared to toluene is due to the presence of delocalized electron cloud in benzene, which results in stronger intermolecular interactions (π-π interactions) between benzene molecules in the solid state.
Which has a higher melting point HF NaCl HCl Cl2?
NaCl has the highest melting point among the compounds listed at 801°C, followed by Cl2 at -101°C, then HCl at -114°C, and finally HF at -83°C.
Does sodium have a higher melting point then potassium?
Yes, sodium has a higher melting point than potassium. Sodium has a melting point of 97.8°C while potassium's melting point is much lower at 63.38°C.
Does salt have a higher or lower melting point than Na or Cl?
Common table salt (sodium chloride) has a much higher melting point than either sodium or chlorine.
Why NaCl has high melting point than hydrogen molecule?
It has to do with the type of bonding. NaCl consists of Na and Cl, held together by a certain bond. One hydrogen molecule consists of two atoms held together by a much stronger bond. A stronger bond requires much more energy (thus higher melting) to break. Ask your chemistry teacher for the specific types of bonds.
Why is irons melting point so much higher than waters?
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Which element has a higher melting point potassium or calcium?
Calcium at 860 degrees celsius potassium melts at a mere 65 degrees celsius
What element has a low melting point francium or plantinum?
The metal francium has a much lower melting point than platinum has.
Can melting point distinguish table salt and table sugar?
Salt or NaCl, has much stronger inter-molecular bonds that form a giant ionic structure in a tight latice. This is because NaCl molecules form stronger bonds than C12H22O11 because NaCl is smaller and it consists of fewer molecules. Being a compound of sodium which is a highly reactive and strong element, salt is much more stable than the carbon compound of sugar. Melting only requires breaking the intermolecular bonds which is difficult in sodium's case.
What are the boiling and melting point's of salty water?
That depends on how much salt is dissolved in the water. Generally, the boiling point will be higher than for pure water, and the melting point will be lower than for pure water.
Can you melt gold with a soldering pot?
No, a soldering pot is typically used for melting solder, which is a lower melting point metal alloy. Gold has a much higher melting point than solder and would require a higher temperature source, like a furnace or torch, to melt.
Sodium oxide melting point higher or lower than water?
Much higher. Water melts around 1 0C. At this temperature and much higher, sodium oxide is a solid.
Would lithium or helium have a higher melting point?
Lithium has a higher melting point than helium. Lithium melts at around 180.5 degrees Celsius, whereas helium melts at a much lower temperature of -272.2 degrees Celsius.
