Q4-W2: Chemical Equilibrium Flashcards
EQUILIBRIUM
BALANCE
STABLE
EQUAL
STEADY
______________ of the color
changes of the indicator if a
______ and an ___________ are added
alternately to the extract.
Reversibility, BASE, ACID
In _____________ reactions, the
reactants are not completely
converted into products and some
of the products may be converted
back into reactants.
REVERSIBLE
Ice melting
into water and water
freezing into ice
REVERSIBLE REACTIONS
When all the reactants in a reaction
are used up the reaction is said to
have gone to completion or
considered _____________ reaction.
IRREVERSIBLE
Paper burning
IRREVERSIBLE REACTIONS
Double headed arrow
⇄
Forward and
backward reactions
occurring
simultaneously
Reversible
Reactions
Single headed arrow
⟶
Forward reaction
only
Irreversible
Reactions
In general terms, a reversible
reaction may be presented as follows:
aA + bB ⇌ cC + dD
NOTE: where the lower case letters represent the
stoichiometric coefficients of the reactants and products
A time-lapsed photograph of the traffic entering and leaving the City
of San Francisco in California, USA through the Golden Gate Bridge
No. of cars ENTERED = No. of cars LEFT
BALANCE
A state of
balance is also
referred to as a
state of ________.
EQUILIBRIUM
In a reversible reaction, when the
__________ start to form the
__________, the _________ would then
start to reform the __________.
In a reversible reaction, when the
reactants start to form the
products, the products would then
start to reform the reactants.
________________ is a condition
in the course of a reversible
chemical reaction in which ___________ in the amounts of reactants
and products occurs.
CHEMICAL EQUILIBRIUM, NO NET CHANGE
A condition where the _______________________ reaction rates of a
reversible reaction are ________________________.
FORWARD AND REVERSE, EQUAL AND CONSTANT
The forward and reverse reactions
proceed at the __________.
SAME RATE
The concentrations of reactants and
products ______________________.
DO NOT CHANGE
The forward and reverse reactions
_________________ to occur.
CONTINUE
The relationship between the concentrations of the reactants and
products may be expressed using the _________________________________________.
law of mass action expression/
equilibrium constant expression.
where the [ ] is the concentration expressed in __________ and Keq is the _______________. If molar concentrations are used, Keq may also be referred as _______________.
molarity, equilibrium constant, Kc
The law of mass action is ….
basically the ratio of the concentrations of the
products raised to their respective
stoichiometric coefficients to that of
the reactants.
The law of mass action expression/ equilibrium constant expression
is written as:
see reviewer»_space;
Pure solids and pure liquids are excluded in writing equilibrium
constant expressions
TRUE!!
Why do we omit pure
solids and pure
liquids in the
equilibrium constant
expression?
because they do not change significantly during reactions when enough is present to reach equilibrium.
Keq ≫ 1
- The equilibrium lies to
the right of the
reaction and favors
the forward reaction. - Products predominate.
Keq «_space;1
The equilibrium lies to
the left of the reaction
and favors the reverse
reaction.
* Reactants predominate.
The main application of chemical
equilibria in industrial process is to
____________ concentration by _____________________.
maximize the desired product, minimizing the
leftover reactants.
