Properties Of Bonding Flashcards
What are properties of covalent molecular substances determined by
Strength of their VDWF
Melting and boiling point is dependent on two stuff
Number of electrons
Type of VDWF
Viscosity
It’s the measure of how thick a liquid is or how slow it moves
Runny liquids have what viscosity
Low viscosity
Ketchups v
Higher
The stronger the IMF the
Slower the liquid moves so the greater viscosity
This means substances with hydrogen bonding will be what
The most viscous
What else does viscosity depend on
Number of electrons
Solubility nat 5
Aqueous solvent such as water or polar so then what are non-acquire solvents
Nonpolar
Solubility rule
Like to dissolve like
Why do polar substances only dissolve polar solvents?
This is due to the permanent dipoles that exist in polar compounds that allows them to attract each other. A non-polar substance doesn’t have this therefore not attracted.
What about ionic substances? What are they soluble in?
Increase substances due to the charges on the ions being attracted to dimples in the polar solvent
When water particles become solid and packed close together, what does this make a substance?
Dense
What happens in water forms ice?
The hydrogen bonds in between the molecules lock the molecules into a type of lattice structure
What does the presence of hydrogen burning make the ice?
A relatively strong material
The presence of hydrogen board doesn’t allow the molecules to pack closely together
But instead of force it to form hexagonal rings which have lots of empty space between them this is why Ice is less than some water
What is a hydrogel
3-D network of hydrophilic polymers that can swell in water and hold a large volume of water while maintaining the structure
What are many hydrogels?
Polymers of carbolic acid
What happens when these polymers are putting into water?
The hydrogen atoms react and come off as some positive irons. This leaves negative ions along the length of a polymer chain.
Why are hydrogels used in disposable nappies?
Hydrogen are good at absorbing polar molecules such as water and ammonia
