paper 1 knowlege gaps Flashcards
bond breaking is
endothermic
bond forming is
exothermic
how to calibrate a ph probe
wash probe
put in calibration buffer and adjust ph reading
repeat in different solution if needed
wash probe between solutions
PRECISE TO 2D.P
acid + metal hydroxide —>
salt + water
purification is electrolysis
metal at both electrodes
at cathode is pure
at anode is impure , the impurites can be collected underneath the anode
relative atomic mass
mean mass compared to one mass of an atom of an element compared to 1/12 mass of carbon-12 atom
relative formula mass
mean mass do à unit of substance compared to 1/12 mass of carbon-12
relative molecular mass
mean mass of molecule compared to 1/12 mass of carbon 12 atom
meaning of avogadros constant
number of entities in one mol
metal oxides are
alkaline
non metal oxides are
acidic
bondifn in simple covalent molecules
covalent bond between atoms are strong
intermolecular forces between MOLECULES are weak
properties of fullerenes
withstand high pressure
carbon can form 3 covalent bonds
forms nanotubes and bukmisterfullerenes
can conduct electricity
atom RADIUS size
x 10 (-10)
uses of nanopraticulates due to sa and v ratio
self cleaning windows and ovens and clothes
catalysts
uses of nano particulates due to small size
medicines
cosmetics
sunscreen
new paints
how to calculate mass of ONE ATOM
atomic mass / avogadros
MASS OF ONE MOLECULE
formula mass / avogadros
number of ATOMS in (given) moles of elements
- calculate moles
- count number of atoms
moles x atoms x avogadros
number of molecules in (given ) moles of an element
molecule = 1
moles x avogadros
acid + metal hydroxide
salt + water
ph meter / probe how to calibrate
wash probe
put in calibration buffer and adjust reading to match true ph
was probe again
repeat between diffferent measurements
——————————————————————-
precise to 2d.p
