Chem practical 11
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Chem practical 11
how do you draw a lewis electron diagram? do one for oxygen and oxygen ion
only valence electrons
if ions -> brackets
and draw arrows moving electrons
structural diagrams include bonds
each line = 2 electrons
atm = ?
760 torr = 760 mmHg = 1 atm = 101.3 kPa
cobalt chloride paper used to test for?
violet flame? red flame?
violet - most energy
red - least
molar volume equation?
Vm = V/n
naming with different number o oxygens
hypo _____ite -2
_________ate - regular
per _______ate +1
acids naming w/ diff number oxygen
ate -> ic
ite -> ous
number line for ionic, polar covalent, covalent bonds
3.3 - 1.7 - 0.4 - 0
ionic, polar cov, coval
what does bicarbonate spontaneously do?
H2CO3 -> H2O + CO2
hydrogen is what with metal and nonmetal?
+ metal = ionic compound
+ nonmetal = covalent
metal oxides = ? non-metal oxides =?
metal oxides = solids
non-metal = gases
fuel + oxygen -> x dioxide + water
some oxides w/ less oxygen content
e.g. carbon monoxide nitrogen monoxide
depends on amount oxygen present
how to collect carbon dioxide ?
calcium carbide in water -> co2
allow air to flow in with accurate amount o gas
single displacement metal oxide + water =?
metal oxide + water -> H2 + MOH <- hydroxide
non-metal oxide + water -> H2 + acid
metal + water -> ?
h2 + MOH
%difference = %error
theoretical - predicted / theoretical
pgas = ptotal - ph20
glass thingy used for titration
and cup thingy
point when color changes and remains not too dramatic
exactly known concentration
to dilute solution use what?
only pour out half at time
from solid or by dilution w/ another liquid
as concetration increase, absorbance o solution increases
actual yield/theoretical yield
ionic materials vs molec compounds
ionic = soluble
conductivity = yes ionic in water
ionic high melting points
ionic generally crystal
ionic very hard generally
molec = nonmet + nonmet
ionic = met + met
decomposition of bicarbonate
produces water + carbon dioxide + salt
# decimal places in ph = ?
# significant digits
pH = 11.00 <-- 2 decimal places
[H+(aq)] = 1.0 x 10
formula to calculate pH
pH = -log[H+(aq)]