paper2 dk Flashcards
how is the operating temp kept low
cryolite
why lid on chromatogram
loss/evaporation of solvent
toxic fumes
uses of nitrogen
aircraft tyres
light bulbs
food packaging
CaCl2
slightly soluble
2 problems with acid rain
limestone corrodes
vegetation dies
blast furnance raw materials
coke
limestone
haematite
iron oxide
limestone
calcium carbonate
molten substance
slag
4 reasons for cracking
- greater supply of long chain
- higher demand for short chain
- alkenes make polymers
- short chain burn more cleanly/easily
monomer
molecule used to make a polymer
gas thats 1% of dry air
argon
2 observations when magnesium reacts with oxygen
bright white light
white solid formed
appearance of iron after a week
brown
why use a burete
more precise
avoids refill
why is mass of CO2 less than expected
CO2 dissolves in acid
why cant use passing over iron filings for CO2
% of CO2 in ir is too small ( less than 1cm3)
molecular formula of ethanol
C2H6O
hydration of ethene +/-
+ fast
+ higher yield
+ no land to grow
+ continuous
- non renewable
- high operating temp/pressure
- phosphuric acid is harmful
crude oil vs kerosene
- crude oil is a mixture of molecule sizes
- both have covalent bonds
- more bonds in crude oil
- kerosene is less viscous
catalyst for ethanol dehydration
Al2O3
why students value differs from data book value for enthalpy change
heat lost to surroundings
KOH dissolves slowly
kerosene use
plane fuel
why is a boiling tube not directly heated with a bunsen
would be heated too quick
flammable
why using not dry sodium chloride could cause explosions
water +sodium makes hydrogen
why sodium wasnt discovered till 1807
electricity not discovered - csnt do electrolysis
chemical test for ethanoic acid
add metal eg Mg
effervescence
test gas with lit splint - squeaky pop
trace gas with highest % in unpolluted air
argon
why fermentation is done with no air
anaerobic conditions
normal respiration doesnt make ethanol
CH3CH2COOCH3
methyl propanoate
why chlorine added to water
to disinfect
