Equilibrium Flashcards
Ion exchange reactions may be reversible if there is no……….. and ………….. on any side
Solid
Gaseous
Solids are precipitated and gases get evaporated
Hydrazoic acid is
N3H
It dissociates into H+ and N3-
Acidic strength of hydroxy acids is direct proportional to………..
Electronegativity of central atom and oxidation state of central atom
Species that will easily accept H+ ion must be…….
Easily donate lone pair of electron thus having low electronegativity
Should not have d subshells
Equilibrium can be established for both physical
processes and chemical reactions.
True
Based on the extent to which the reactions proceed to reach the state of chemical equilibrium, these may be classified in three groups.
(I) The reactions that proceed nearly
to completion and only negligible
concentrations of the reactants are
left. In some cases, it may not be even
possible to detect these experimentally.
(ii) The reactions in which only small
amounts of products are formed and
most of the reactants remain unchanged
at equilibrium stage.
(iii) The reactions in which the concentrations
of the reactants and products are
comparable, when the system is in
equilibrium.
Assertion: Equilibrium is not static. The intense activity can be noticed at the boundary between ice and water.
Reason Molecules from the liquid water collide against ice and
adhere to it and some molecules of ice escape
into liquid phase.
Both are correct and correct explanation
Statement 1: Physical equilibrium can only be attained in close vessel
Statement 2: Some Changes take place at molecular level in physical equilibrium
Q is correct and W is incorrect
No changes occur at molecular level
Give two Drying agent
anhydrous calcium chloride
phosphorus penta-oxide
Characteristic of equilibrium
Equilibrium can be established only in case of closed system.
The equilibrium is always dynamic in nature.
The measurable properties of the system become constant at equilibrium.
At equilibrium, there exists an expression involving concentration of reacting substances which becomes constant at a given temperature.
The magnitude of the constant value of the concentration related expression called equilibrium constant) gives an indication of the extent to which the reaction has proceeded before acquiring equilibrium
Vapour pressure of water………….with temperature.
increases
Time taken for complete evaporation depends on
3 things
(i) the nature of the liquid
(ii) the amount of the liquid
(iii) the temperature.
For any pure liquid at one atmospheric pressure (1.013 bar), the temperature at which the liquid and vapours are at equilibrium is called normal……..point of the liquid.
boiling
For any pure liquid at one atmospheric pressure (1.013 bar), the temperature at which the liquid and vapours are at equilibrium is called normal…….point of the liquid.
boiling
Statement 1: Boiling point of the liquid depends on the atmospheric pressure.
Statement 2: It depends on
the altitude of the place; at high altitude the
boiling point decreases.
Both are correct
Statement 1: The concentration of the solute in a saturated
solution depends upon the temperature.
Statement 2: In a saturated solution, a dynamic equilibrium
exits between the solute molecules in the solid
state and in the solution
Both are correct
Assertion: When a soda water bottle is opened, some of
the carbon dioxide gas dissolved in it fizzes
out rapidly.
Reason:The phenomenon arises due
to difference in solubility of carbon dioxide
at different pressures.
Both are correct and correct explanation
The soda water bottle is sealed
under pressure of gas when its solubility in
water is low
False
Solubility in water is high
Norwegian chemists Cato Maximillian Guldberg and Peter Waage proposed in 1864 proposed the law of………
Mass action
Law of mass action states
It states that the rate of a chemical reaction is directly proportional to the product of active masses of the reacting substances raised to the power equal to the stoichiometric coefficient in the balanced chemical equation.
Equilibrium Law or Law of Chemical
Equilibrium.
At a given temperature, the product of concentrations of the reaction products raised to the respective stoichiometric coefficient in the balanced chemical equation divided by the product of concentrations of the reactants raised to their individual stoichiometric coefficients
has a constant value.
In a…………system, all the reactants and products are in the same phase.
homogeneous
Equilibrium in a system having more than one phase is called……….equilibrium.
heterogeneous
Equilibrium constants can also be expressed as dimensionless quantities if the standard state of reactants and products are specified.
True or false
True
