Which Solid Has the Highest Melting Point?

In summary, Chem-highest melting point refers to the highest temperature at which a chemical substance can change from a solid to a liquid state. The melting point of a chemical is typically determined by heating a sample of the substance while monitoring the temperature. Factors such as pressure, impurities, and chemical structure can affect the melting point. The melting point can be used to identify a chemical, as each substance has a unique melting point. Knowing the melting point of a chemical is important for determining purity, identification, and potential uses.
  • #1
geffman1
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Homework Statement



hey guys, just wondering if you could tell me which of these is polar and how to do it thanks? the question is asking for the highest melting point, so i believe it relates to which is polar. any help would be greatly appreciated.

Homework Equations



Which of the following solids would have the highest melting point?
NaI
CsF
MgO
MgCl2
KF

The Attempt at a Solution

 
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  • #2
It is all about Coulomb forces.
 
  • #3


The solid with the highest melting point would be MgO. This is because MgO has a very high ionic bond strength due to the large difference in electronegativities between magnesium and oxygen. This strong ionic bond requires a lot of energy to break, resulting in a high melting point. Additionally, MgO has a symmetrical crystal structure, which also contributes to its high melting point. NaI, CsF, MgCl2, and KF all have lower melting points due to weaker ionic bonds and/or less symmetrical crystal structures.
 

1. What is the definition of "Chem-highest melting point"?

Chem-highest melting point refers to the highest temperature at which a chemical substance can change from a solid to a liquid state.

2. How is the melting point of a chemical determined?

The melting point of a chemical is typically determined by heating a sample of the substance until it starts to melt, while constantly monitoring the temperature. The temperature at which the substance completely melts is recorded as its melting point.

3. What factors can affect the melting point of a chemical?

The melting point of a chemical can be affected by factors such as pressure, impurities, and the chemical structure of the substance. Changes in these factors can cause the melting point to shift either higher or lower.

4. Can the melting point of a chemical be used to identify it?

Yes, the melting point of a chemical can be used as a physical property to help identify the substance. Each chemical has a unique melting point, so comparing the melting point of an unknown substance to known values can help determine its identity.

5. Why is knowing the melting point of a chemical important?

The melting point of a chemical is important for several reasons. It can provide information about the purity of a substance, aid in its identification, and also play a role in determining its potential uses and applications.

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