stuff ive gotten wrong paper 1 Flashcards
(19 cards)
what happens to the Ph down group 2
Ph of solution increases
what is observed when a group 2 reacts with Hcl
Effervescent
solid dissolves
why is the 2nd IE of sr greater than the first
2nd electron removed from a positively charged ion
greater attraction between nuclues and outer electron
why would HCL produce a gas at a. faster rate to CH3COOH
HCL strong acid
CH3COOH weak acid
greater h conc in hcl more frequent collisions
same total moles of h produced
breaking bonds endo or exo
endo - energy needed to break bonds
forming bonds endo or exo
exo - energy released when bonds are formed
straight line
G= H- TS
G Y axis
S gradient
T x axis
H y intercept
what is the shape and bond angle of NH2
non linear
104.5
which one loses the h in conjugate acid base pairs
the one with the lower Pka - the stronger acid
average bond enthalpy
breaking of 1 mole of covalent bonds in gaseous molecules
explain in terms of Kp - how would eqb mix change position when pressure increases
kp not affected by pressure]eqb shifts right as more moles of gas on the right
ratio of thing is greater than kp
ratio in kp decreases
so ratio increases to restore kp
why use 0.002 rather than 0.02 in titration
larger titre smaller percentage error
in terms of bond making and bonds breaking why would a reaction have negative H value
more energy released forming bonds than energy needed to break bonds
what does it mean if kp is greater than 1
kp is far to the right
how do catalysts make processes more sustainable
lower energy demand reaction can be carried out at a lower temp
less fossil fuels burnt so lower co2 emissions
how do london forces arise
A dipole is created by the uneven distribution of electrons
creating a temporary dipole
causing an induced dipole in neighbouring molecules
bromine and chlorine - what happens to cyclohexane
turns yellow
bromine and idodine colour
purple
