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Will the melting point rise if the force of the attraction between positive and negative ions?
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Does Ice melting have a positive or negative enthalpy?
Negtive
Why the melting point of methane is high?
Methane has an extremely low melting point. This is due to weak intermolecular attraction.
Do the molecules of alkanes have strong intermolecular forces and high melting points?
No, alkanes are non polar compounds and have low intermolecular attraction and low melting points.
What is difference between melting point and drop melting point?
No basic Difference between melting point and Drop point.
Is melting a physical change?
No it is a chemical change
Why the melting and boiling points of ionic is higher then atom?
due to the strong electrostatic force of attraction between the positive cations and negative anions in ionic compounds
Does Ice melting have a positive or negative enthalpy?
Negtive
What are ions and what are the properties of ionic compounds?
When an atom loses an electron, it loses a negative charge and becomes a positive ion. When an atom gains an electron, it gains a negative charge and becomes a negative ion. Ionic bonds form as a result of the attraction between positive and negative ions. When ionic compounds form, the ions come together in a way that balances out the charges on the ions. The chemical formula for the compound reflects this balance. For an ionic compound, the name of the positive ion comes first, followed by the name of the negative ion. In general, ionic compounds are hard, brittle crystals that have high melting points. When dissolved in water or melted, they conduct electricity.
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.
Why does the melting point increase from sodium to aluminium?
The cation becomes more positive from sodium to aluminium, so its attraction for the sea of electrons increases.
What is the difference between zircon melting point of 2500 and mercury melting point of negative 39?
2539 degrees
What is the deference between ionic bonds and covalent bonds?
covalent bonds: relatively low melting point, bond is not as strong as ionic, form between two nonmetals, valence electrons are shared between the atoms. ionic: relatively high melting point, stronger bond than covalent, form between a metal and nonmetal, valence electrons are transferred from the metal to the nonmetal, leaving the metal with a positive charge and the nonmetal with a negative charge. these charged particles are called ions. positive ion=cation, negative ion=anion.
Why do ionic bonds have a high melting point?
Due to the strong force of attraction existing between the ions in the molecule.
Why does calcium oxide have a higher melting point than sodium chloride?
CaO - the attraction between a 2+ and a 2- ion is much stronger than between a + and a -.
Do non polar molecules have high melting points?
No, It is infact polar molecules that have higher melting points than non-polar molecules. Polar molecules have stronger intermolecular bonds called dipole-dipole forces. These forces are an attraction between the slightly positive end of one molecule with the slightly nehative end of another.
Do ionic bonds form lower melting points?
No, ionic compounds have high melting and boiling points. This is due to the strength of the electrostatic attraction between the positively-charged and the negatively-charged ions.
What is the relationship between the molar enthalpy of fusion of a solid and the strength of attraction between that solids particles?
the strength of attraction is proportional to 1/d 3, where d is the distance between dipole
