outside chem scope questions Flashcards
why would big constuction projects eg using local piggeries to produce biogas, be opposed by the public
- noise pollution
- air pollution
- proximity to housing
safety issues with thermometer
- mercury is toxic -> use gloves incase of breakage
why is methane from biogas less environmentally damaging than leaving animal waste to decompose in fields
animal waste breakdown -> release methane
collecting waste -> biogas reduces methane production
although combustion of biogas still releases CO2, the impact this has on the atmosphere is less than of that of methane
uses of ammonia
- manufacture explosives
- household cleaning agents
- produce urea (react w CO2) -> fertiliser
safety considerations w Haber process
- pressurised system tf ensure no leaks through sensors to detect leaks
- NH3= dangerous if inhaled tf well ventilated area
- NH3 is toxic and corosive -> safety gear
safety with hydrogen
- highly flammable
- colourless, tasteless and odourless tf leaks would be difficult to detect
- difficult storage - very high pressures bc lightest element
how to obtain hydrogen
- fossil fuels through reforming process using hydrocarbon fuels
- renewable sources to provide electricity by breaking down water into H2 and O2 eg electrolysis of ocean water
safety concerns: OH
caustic tf wear gloves
NaOH is also caustic
safety concerns Cl2(g)
toxic
safety concerns of pacemakers
-leakage of salt electrolyte
leakage of products/reactants (l)
electrolytic vs galvanic cell
electrolytic:
- PANIC
- non-spontaneous reaction
- does not require separation of half cells
- no salt bridge required
- pwer supply required
in electroplating, why is the object being electroplated at the cathode
bc the cathode has a negative charge and cations migrate to the negative cathode
how does coal produce electricity
- thermal: coal is pulverised to fire powder and burned
- resulting heat is used to turn water into steam
- steam at very high temperatures spins the turbine and powers and electrical generator
