Edexcel CHEMISTRY DOUBTS!!!!

[**RoRo**]

I dont think u need to memories those equations, but then u should know how to write ionic equations generally in case it comes up.

When branching increases the melting point decreases because the atoms are less packed together and therefore the intermolecular forces are weaker

Great! Thank you very much! 

[NidZ- Hero]

The solubity of a compoud depends on what

Is it that the amount of hydration energy released compensates for the amount of energy required for the lattice energy when the compound break  :S

[Malak]

The solubity of a compoud depends on what

Is it that the amount of hydration energy released compensates for the amount of energy required for the lattice energy when the compound break  :S

Yes, both should balance each other out, this why ionic substances dissolve in water 'cause the energy is balanced out

[NidZ- Hero]

Yes, both should balance each other out, this why ionic substances dissolve in water 'cause the energy is balanced out

And one web sorce said that they r polar so dissolve in polar solvents lke water n ethanol

[Malak]

And one web sorce said that they r polar so dissolve in polar solvents lke water n ethanol

Generally:
Polar dissolves in polar
Non-polar dissolves in non polar

[NidZ- Hero]

hey one more thng why does small cation is  good in polarizing and large anion get polarized

In my Edxcel book its says : the larger the negative ion and large its charge
Why does charge has to be large

[Malak]

hey one more thng why does small cation is  good in polarizing and large anion get polarized

In my Edxcel book its says : the larger the negative ion and large its charge
Why does charge has to be large

If a cation is small i.e. it has small radius then its has a greater charge density.
For cations: Small radius + high charge = greater charge density
For anions: The larger it is (large radius) the more easily it gets polarised

m not sure why ur book mentions charge for anion 'cause in my book it says that for anion it solely depends on the radius.
But what i can guess ur book means is --> if the charge is higher (more negative), the anion is more polarisable as more negative charge means more electrons are added to it and so the radius gets larger

[NidZ- Hero]

If a cation is small i.e. it has small radius then its has a greater charge density.
For cations: Small radius + high charge = greater charge density
For anions: The larger it is (large radius) the more easily it gets polarised

m not sure why ur book mentions charge for anion 'cause in my book it says that for anion it solely depends on the radius.
But what i can guess ur book means is --> if the charge is higher (more negative), the anion is more polarisable as more negative charge means more electrons are added to it and so the radius gets larger

Same even i gt gt confused abut the charge on the anion

[NidZ- Hero]

Thanks Angel

how does hydroxide ions make the solution basic or alkali? 

[The Golden Girl =D]

Generally:
Polar dissolves in polar
Non-polar dissolves in non polar

Acetone is the only solvent that dissolves in both

[Amelia]

Thanks Angel

how does hydroxide ions make the solution basic or alkali? 

A solution is a base or alkali if it contains and releases the hydroxide ions (OH^-).

[sharleen07]

any suggestions about what to study for the chemistry A2 practicals (edexcel)??

[The Golden Girl =D]

any suggestions about what to study for the chemistry A2 practicals (edexcel)??

Check this :

https://studentforums.biz/pastpapers/edexcel-unit-6b-(6ch08)-practicals/

GG

[Malak]

What is the explanation of graphite being malleable?

[**RoRo**]

What is the explanation of graphite being malleable?

The intermolecular force of attraction between the layers of atoms, the Van der Walls force of attraction is a relatively weak force that can be easily broken and therefore the individual layers can slide over each other making graphite malleable.