questions wrong Flashcards
Outline the use of infrared spectroscopy in identifying air pollutants such as NOx.
- used to identify functional groups/ to identify the bonds
- match spectrum to known pollutants, u can measure the concentration of a pollutant
State two modern analytical techniques that scientists can use to monitor environmental
pollution.
- IR spectroscopy
- mass spectrometry
N2(g) + ½O2(g) N2O(g)
(i) It is not possible to measure the enthalpy change of formation of N2O(g) directly.
Suggest why it is not possible
the activation energy is too high (also for respiration which is exothermic)
) Explain how atmospheric methane molecules can contribute to global warming
- absorbs IR radiation, bonds vibrate
Give two reasons why there are many organic products of the reaction between bromine
and ethane.
- lots of termination steps
- termination steps can give products that will react with radicals.
Explain, in terms of bond breaking and bond forming, why a reaction is exothermic
-bond breaking absorbs energy and bond forming releases energy, more energy is released than absorbed
explain why one elements ionisation energy is higher
- increased shielding
- extra shell
- increased atomic radii
- nuclear attraction is less
- outweighs the effect of an extra electron
state one difference between the pi bond and sigma bond
the sigma bond is between bonding atoms and the pi bond is above and below the bonding atoms
why is something endothermic
more energy is required to break bonds than is released making bonds
talk about similarities with bond pairs and lone pairs
they both repel but the lone pairs have extra repulsion
if there is a final peak on the mass spectrum, what’s this called
M/Z or molecular ion peak
what does bond making do
release energy
what does bond breaking do
take in energy
why cant ionic structures conduct electricity when solid
ions aren’t free to move as they are held in a fixed lattice
alcohol to alkene conditions
acid catalyst and heat
