44given the equation representing a reaction at equilibrium : 2so2(g) + o2(g) ==> 2so3(g) + heat
which change causes the equilibrium to shift to the right?
(1) adding a catalyst
(2) adding more o2(g)
(3) decreasing the pressure
(4) increasing the temperature

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?