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Chem ch.2
part 1 chemistry
15
Chemistry
12th Grade
10/28/2012

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Cards

Term
Describe chemical equilibrium
Definition
occurs whem two opposing rections in a reversable, closed chemical system are happening at exactly the same rate. . There is a balance existing at the reaction rate.
Term
why is it called dynamic equilibrium?
Definition
because despite no net absobablee chambe, reactions continue to occur at molecular level.
Term
macroscopic properties must be...
Definition
at constant equilibrium
Term
In an equilibrium, what does an increase of temperature do to the system?
Definition
increasing temperature speeds up all chemical reactions HOWEVER it favors endothermic direction.
Term
In an equilibriumm what does an decrease of temperature do to the system?
Definition
it favors exo thermic reaction.
Term
4 absolute requirements for equilibrium
Definition
1. system must be closed
2.temperature is constant
3. opposing reactions occur at equal rates
4. can be reacted by starting from either reactant or product (REVEERSIBLE REACTION)
Term
In a susterm of equilibrium, explain the rate of the forward reaction and revers reaction.
Definition
they are equal
Term
Explain the appearance of equilibrium systems
Definition
picroscopic processes continue in a balance which yields no macroscopic changes so nothing apperas to be happening.
Term
if one mole of X and one mole of Y ar emixed in a 1.0 litre container, the rate of the forward reaction will initally be
Definition
fast
Term
immediately aftermixing, the rate of the reverse reaction will be
Definition
zero
Term
While the forward rate > the reverse rate, the [NO] and the [CO2] will be
Definition
increasing
Term
After the initial mixing, the rate of the forward reaction will be____ while the The rate of the reverse reaction will be ____-
Definition
decreasing and increasing
Term
Once equilibrium is established, what can be said about the rates of the forward and reverse reaction
Definition
the rates are equal
Term
NO2 is a darker brown colour. All of the other gases are colourless. Describe what will happen to the colour of the gas mixture from when the NO2 and CO are mixed until equilibrium is established
Definition
It is dark at first (high [NO2]). The colour will gradually get lighter until equilibrium is reached. Apter that, it will remain constant. (light brown)
Term
one mole of NO and one mole of CO2 are mixed. If left lone at a constant temperature_____ will be established. Once this is reached, will the colour be different than the equilibrium in the previous card?
Definition
equilibrium and no. it will end up as the same colour. (equilibrium can be approached from the leeft or from the right)
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