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Why does the melting point of group 2 oxides decrease down the group?
Wiki User
∙ 10y ago
Group Two elements form oxide consisting of ionic bonds. With that in mind, as you go down group two, the ionic radius increases due to an addtion of a electron shell, so therefore, melting point of group2 oxide decreases down group because the distance between the O2- and Group two ion are further apart. The increase of bond length results in less energy needed to break the ionic bonds, resulting in decrease of energy.
Wiki User
∙ 10y ago
Wiki User
∙ 13y agoThe solubility of a substance is determined by the strength of the reverse lattice energy(opposite of lattice energy) and the hydration energy. A substance is soluble when the reverse lattice energy is greater than the hydration energy.
Moving down group 2 the atomic radii increases( the repulsive force is greater than the attractive force of the nuclear charge). Unlike sulphates or carbonates the size of the hydroxide ion is small and so the sum of the anion and cation would be large leading to a decrease in lattice energy since the two are inversely proportional. Because of this the hydration energy outweighs the lattice energy and so the solubility of the hydroxides increases down the group.
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What is the melting point for Mg?
The melting point of magnesium is 650 degrees celcius. It has the lowest melting point among all the group II metals (alkaline earth metals), though the melting points generally decrease down the group - magnesium is an exception and has the lowest melting point among them.
Why is melting point of magnesium less than calcium although melting point decrease down the group?
because hall 's of magnesium larger than hall 's of calcium
Will the melting point of ice increase or decrease when salt is added on it?
The melting point of ice decreases when salt is added.
How do you prove that glucose do not raise the melting point of stearic acid?
No, impurities do not raise the melting point of Stearic Acid, they decrease it. All impurities decrease the melting point of solids.
Why vacuum reduces melting point?
The crystal lattice will slightly effect the high vacuum and eventually decrease the melting point particularly decomposing solids.
How melting and boiling point varied in a period?
Generally melting point and boiling point increase up to group 6 and then decrease.
What is the melting point for Mg?
The melting point of magnesium is 650 degrees celcius. It has the lowest melting point among all the group II metals (alkaline earth metals), though the melting points generally decrease down the group - magnesium is an exception and has the lowest melting point among them.
What must become weaker for the melting point to decrease down the group?
The bonds between the electrons
Why is melting point of magnesium less than calcium although melting point decrease down the group?
because hall 's of magnesium larger than hall 's of calcium
What Would be the effect poorly packed in melting point?
The effect of poorly packed will decrease the melting point.
Will the melting point of ice increase or decrease when salt is added on it?
The melting point of ice decreases when salt is added.
How do you prove that glucose do not raise the melting point of stearic acid?
No, impurities do not raise the melting point of Stearic Acid, they decrease it. All impurities decrease the melting point of solids.
How you can down the melting point of palm stearin?
Increasing the purity of most substances increases the melting point. The opposite is also true: decreasing purity usually results in a decrease in melting point. Adding another palm oil derivative or palm oil itself would decrease the melting point of the palm stearin.
When common salt is mixed with ice its melting point is?
melting point decreases as Na+ and Cl- ions occupies the air gaps in the ice .And hence solidifies results in decrease of its melting point
How does salt affect the water's melting point?
Adding salt to water the freezing point decrease.
Why vacuum reduces melting point?
The crystal lattice will slightly effect the high vacuum and eventually decrease the melting point particularly decomposing solids.
Why melting point decrease down the group for Alkali metals but increase for Halogens?
Because the atomic radius increases down the group 1 and decreases down the group of halogen
