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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.
Wiki User
∙ 11y ago
Wiki User
∙ 10y agoBoth compounds have the same crystal structure the so-called rock salt structure. The difference is that the potassium ion is larger than the sodium ion because the potassium ion has more electron shells. This increase in size means that the oppositely charged ions in KCl are further part than those in NaCl and therefore it takes less energy to break up the ionic bond in KCl which we see as a reduction in the melting point. Technically the lattice energy in KCl is lower because of the larger size of the potassium ion.
Wiki User
∙ 11y agoNaCl is an ionic bond(Metal and non metal) The intermolecular bonds are much stronger.
Ammonia (NH3) is a covalent bond (Non metal and non metal) The covalent bonds are weaker...so it's easier to break
Wiki User
∙ 10y agoKCl has stronger attraction forces compare to AgCl. Ag is transition element which has characteristic of convalent in ionic bond. It need less heat to break the attractive force of AgCl. Thus, melting point of AgCl is lower than KCl.
Wiki User
∙ 13y agobecause sodium chloride is a crystalline solid so its melting point is grater than hydrogen chloride
Wiki User
∙ 9y agoNaCl is huge lattice.It is very stable.CH4 is non polar.It has weak london forces
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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 weaker intermoleclar forces. Benzene has a higher melting point than toluene because it is more symmetrical.
What temp will a tin can melt?
the melting point of tin (the element) is 21.23 º C Important to note that most "tin" cans are not tin. They are low carbon steel with a very thin, if any, tin plating. I'm not sure where the original answer got the melting point of tin. The actual melting point of tin is 231.93 °C or 449.47 °F. If the can is steel then it will take a much, much higher temperature to melt.
What temperature does it have to be to melt a soup can?
Most soup cans are not aluminum- they are tin plated steel. While the exact melting point will vary with the alloy used, it is ABOUT 1,350 degrees Celsius. It is MUCH higher than the melting point of aluminum.
What is misleading with the term melting point?
The term "melting point" is misleading because the melting point is dependent on both the amount pressure and heat applied. At 1 atm (atmosphere), the melting point is called the "normal melting point." The amount of heat necessary to melt a substance at it's normal melting point is consistent with the substance's generally accepted melting point; like 0ºC for H2O. When the amount of pressure is changed, the amount of heat necessary to melt the substance also changes, therefore completely altering the melting point of said substance. For example, 1 atm is usually found at sea level, so the amount of heat having to be added to a substance to melt it at that altitude is equal to it's normal melting point. When attempting to melt the same substance at higher altitudes, (higher altitudes will contain more than 1 atm of pressure) the substance will not require as much heat as it did while melting at sea level. As previously mentioned, H2O converts from ice into water at 0ºC while under 1 atm of pressure (normal melting point). However, in an altitude of 10,000ft the melting point of H2O may change to something like -6ºC opposed to the generally accepted 0ºc. Tl;dr- The term "melting point" is misleading, because it leads us to believe that the melting point will always be consistent in a substance. However, in reality the "melting point" is only consistent to a given amount of pressure the substance is undergoing. *atm (atmosphere) is a unit of measurement to convey a given amount of pressure. It's usually is used to convey the amount of pressure in altitudes.
How do the melting point and the freezing point of a substance compare?
Both indicate the temperature at which the solid and liquid states of a substance are in equilibrium.
Which has a higher melting point HF NaCl HCl Cl2?
NaCl has ther highest melting point, as it is a solid at room temeprature. The other are gases and there fore have much lower boiling points and lower again for melting points.
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 is irons melting point so much higher than waters?
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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 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 weaker intermoleclar forces. Benzene has a higher melting point than toluene because it is more symmetrical.
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 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.
Why does LiBr have a higher boiling point than I2?
LiBr is a salt and part of a crystal lattice. The bonding is thus very strong requiring a lot of energy to break them resulting in a fairly high melting point like NaCl. Iodine I2 has a much weaker single covalent bond.
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.
What is the melting temperature of a substance?
This is the definition of the melting point of an element or substance. The melting point is when a solid begins to turn into a liquid. A substance also has a boiling point and freezing point.
What is the melting point of a metallic element?
It depends upon the element. Mercury is liquid at room temperature, and the melting point of aluminum is much lower than the melting point of iron.
Why mo has high melting point tha nacl?
The simple explanation- it takes less energy to beak up the ionic lattice of NaCL than it does to break up the metallic lattice of Mo. Molybdenum is high melting metal, mp. ca. 2600 C. (thats really hot!) The reasons why some metals are high melting and some are low is complex. In simple terms Mo has a very strong metallic bond. Nacl is an ionic compound, these generally have high melting ponts NaCl is ca 800 C (thats also very hot but obviously much less than Mo. Predicting melting ponts is difficult.
