Principles of Chemistry II Exam 1

pchem 2 exam 1

what is the H and S? PF or RF at what temperature?

H>0 S>0, PF at high temp

what is the H and S? PF or RF at what temperature?

H<0 S<0, PF at low temp

what is the H and S? PF or RF at what temperature?

H>0 S<0, never PF

what is the H and S? PF or RF at what temperature?

H<0 S>0, always PF

what is the H and S of this?

H>0 S>0

what is the H and S of this?

H<0 S<0

What is the H and S of this?

H<0 S>0

what is the H and S of this?

H>0 S<0

A negative delta g means?

a product favored reaction

A positive delta g means?

a reactant favored reaction

what is the equations for equilibrium constant?

products/reactants

A K>1 means?

A product favored reaction

A K<1 means?

A reactant favored reaction

the more O2 required during combustion of fuel means?

the more energy released

what do oxygenated fuels require and produce?

they require less o2 during combustion but also produce less energy per mole of fuel

does forming bonds is energy released or taken in?

released

when breaking bonds is energy released or taken in?

taken in

is breaking bonds and exo or endo thermic process?

endo because energy is taken in to break the bonds

how do elements get a standard enthalpy of Hf equal to zero?

it has to be in its standard base state, like C with graphite or O2 gas

what type of bonds will have a longer internuclear distance on the curve graphs?

double bonds or triple bonds, then A-B bonds, then A-A bonds

is more disorder good for entropy? (s)

yes it increases the entropy value of the compound

What is H and S of this and what is favored?

H>0 S<0 and RF

What is H and S of this and what is favored?

H>0 S>0 and PF at high T

What is H and S of this and what is favored?

H<0 S>0 and PF

What is H and S of this and what is favored?

H<0 S<0 and PF at low T

how to decide which is more energetically stable?

solids, liquids, then gases then charges, the closer Fr the less stable because radius

if more bonds are broken than made it will be?

endothermic

if more bonds are made than broken it will be?

exothermic