New Concepts/Shortcuts 19 Flashcards
the formula for new means if the wrong observation is deleted and the new one is added
why does the stability of peroxide or superoxide increase as the size of the metal increases?
due to the stabilization of large anions by larger cations through lattice energy
metals with liquid ammonia forms? and then on concentration forms?
what trend Does the MP and BP of halogens always follow?!
the low solubility of LiF in water is due to the?
its higher lattice enthalpy
the low solubility of CsI is due to?
smaller hydration enthalpy
LiCl and MgCl2 are soluble in?
ethanol
hydrogen carbonates are not formed by which metals?
Li and Mg
why cant the potassium carbonate be produced from the Solvay process?
because potassium hydrogen carbonate is too soluble in the ammonium hydrogen carbonate
which grp 2 element is not alkaline earth metal?
beryllium
hydration enthalpy of alkaline earth metals is more/less than the hydration enthalpy of alkali metals?
hydration enthalpy of alkaline earth metals is more than the hydration enthalpy of alkali metals?
most reducing earth metal is?
barium
which alkaline earth metals do not give flame test
beryllium and magnesium
beryllium in which form reacts with air and what does it form?
Be in powdered form reacts with air and burns brilliantly on ignition in the air to give BeO and Be3N2
which alkaline metal does not combine with Hydrogen upon heating to form its hydride?
Beryllium
how can BeH2 be created?
why are metal fluorides less soluble than chloride?
high lattice energies
the tendency to form halides generally increases or decreases down the grp for alkaline earth metals?
decreases down the grp
chlorides of which metals have a Cli bridge in vapor phase?
Be and Al
just keep this in mind
important ingredients present in Portland cement are?
tricalcium silicate (3CaO · SiO2) dicalcium silicate (2CaO · SiO2) tricalcium aluminate (3CaO · Al2O3) tetra-calcium aluminoferrite (4CaO · Al2O3Fe2O3).
whats glyptal? what is it made up of and where is it used?
it is used in paints and lacquer
dacron made of?
ethylene glycol and terephthalic acid
nylons/polyamide is an eg of which kind of polymers?
condensation polymers
novolac formation reaction
bakelite structure
melamine formation reaction
how is PHBV formed and what’s the full form of PHBV?
poly beta-hydroxybutyrate - co-beta-hydroxy valerate
eg of biodegradable polymers?
PHBV
nylon 2-nylon 6
K2MnO4 in acid forms!?
eg of fat-soluble vitamins and eg of water-soluble vitamins
fat soluble:- A,D,E,K
water soluble:- B grp and C
eg of fat-soluble vitamins and eg of water-soluble vitamins
fat soluble:- A,D,E,K
water soluble:- B grp and C
vitamins that should be supplied regularly in diest are? and why?
water-soluble vitamins( B grp and C)
because they are readily excreted in urine and cannot be stored in our body
which water soluble vitamins can not be readily excreted in urine and cannot be stored in our body
B 12
length of antenna formula
lambda being the wavelength of the signal
energy density formula for electric and magnetic field
partially filled dileectric formula
what are polycrystalline solids?
there are some solids that apparently appear amorphous but have microcrystalline structures these are polycrystalline solids
metals often occur in polycrystalline condition
