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The melting point of an impure compound is almost *always* lower than that of a pure compound.
Wiki User
∙ 15y ago
Wiki User
∙ 9y agoThe impurities in the compound prevent the substance from forming a crystal lattice, thus decreasing its bond strength and lowering the melting point.
Wiki User
∙ 13y agoThis greatly depends on the impurity but most common is a lower melting point for impurified substances: Ice with salt or sugar.
Wiki User
∙ 12y agoat what temperature does saltwater melt?
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Which substance ionic or covalent has a higher melting point?
Generally the ionic molecules has a higher melting point.
How does IMF affect the boiling point or melting point of a substance?
The stronger the IMF, the higher the boiling point and the lower the melting point. The weaker the IMF, the lower the boiling point and the higher the melting point.
Is the melting point of impure water lower or higher than freezing point?
The boiling Point of impure water is 100 degrees celsius
Is a sharp melting point for a crystalline organic substance always indicates a pure single compound?
Nope; not always. So the answer would be false. You have to realize that there might be impure substances mixed. Likewise impure substance can either lower the melting point or increase it :)M. Bilal :)
What substance has a higher melting point silicon dioxide or methanol?
SiO2
Higher melting point than expected?
It is indeed possible for a substance to have a higher melting point than expected. This normally happens when the substance is impure.
How is the melting of an impure compound expected to change with recrystallization?
The melting point of an impure compound will become closer to that of the actual melting point of the pure substance with recrystallization of your mixture.
If a substance is impure what will be the two effects on its melting point compared to the literature value?
the impurities will lower the melting point value.
When the observed melting point is less than the stanadr value what inference will you get?
The substance whose melting point is being observed is impure.
What happens to the melting point of urea and cinnamic acid when mixed?
The melting point will be reduced because an impure substance is not held together as strongly as a pure substance therefore it takes less energy to break the bonds or attractive forces holding the impure substance together.
What is purity criteria?
The criteria of purity of a compund isÊdetermined at it melting point.ÊA pure compound a definate melting point. While an impure substance has an indefinate melting point.
Which substance ionic or covalent has a higher melting point?
Generally the ionic molecules has a higher melting point.
How does IMF affect the boiling point or melting point of a substance?
The stronger the IMF, the higher the boiling point and the lower the melting point. The weaker the IMF, the lower the boiling point and the higher the melting point.
Is the melting point of impure water lower or higher than freezing point?
The boiling Point of impure water is 100 degrees celsius
Is a sharp melting point for a crystalline organic substance always indicates a pure single compound?
Nope; not always. So the answer would be false. You have to realize that there might be impure substances mixed. Likewise impure substance can either lower the melting point or increase it :)M. Bilal :)
What substance has a higher melting point silicon dioxide or methanol?
SiO2
What is the simple physical test to show that a sample of water is pure?
A scientific test you do on water similar to a chemical test
