Saturday
October 25, 2014

Posts by olexandra


Total # Posts: 4

chemistry
According to the experiments concerned with photoelectric effect, what would inrease the kinetic energy of electron ejected from a metal surface? Decreasing the wavelength of the light, drecreasing the frequency of the light or increasing the number of photons of light ...
May 10, 2010

chemistry
How to calculate enthalpy change of the following reaction? : S + 2h2o >>> so2 + 2h2 given: s+o2 >>> so2 - enthalpy change = -296.8 kJ h2 + 1/2o2 >> h20 enthalpy change= -285.8kj I was trying to solve it myself but i got confused.. i know i have to ...
April 19, 2010

chemistry
i forgot to add the equation: n2H4 + 02 -> N2 + h2o
April 19, 2010

chemistry
N2H4 reacts with oxygen to yield nitrogen gas and water . The reaction of 3.80g n2h4 evolves 73.7kj of heat. what's the enthalpy change per mole of hydrazine combusted.
April 19, 2010

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