what is the definition of a dynamic equilibrium and what is an example of this?

Question

for chemistry gcse

Answer 1

dynamic equilibrium occurs where a reaction is reversible... ie reactants are reacting to form products at the same time as products are dissociating back into reactants. a point comes during a reaction (determined by the equilibrium constant and Le Chateliers principle) where the rate of reactants becoming products equals the rate of products becoming reactants again... thus, there is no net change in the amount of either reactants or products, even though changes are taking place.

an example of this would be synthesis of ammonia... a double-headed arrow, both directions, denotes this type of reaction.

Answer 2

A dynamic equilibrium is a situation in a reversible reaction in which the rate of forward reaction is the same as the rate of backward reaction. As a result, the system appears to be at equilibrium but the reaction processes are still taking place.

An analogy would be a man trying to walk up the steps of an escalator that is moving downwards. If he moves at the same speed as the escalator, he will appear stationary even though he is still moving.

Dynamic equilibriums are very common. An example that relies on dynamic equilibrium would be the production of ammonia by the Haber Process.

Answer 3

A dynamic equilibrium occurs when two reversible processes occur at the same rate. Many processes (such as some chemical reactions) are reversible and when at dynamic equilibrium the forward reaction will occur at the same rate as the reverse reaction.

An example of the process can be imagined if a bucket is filled with water and placed in a small room. The water from the bucket will evaporate, and the air in the room will start to become saturated with water vapor. Eventually, the air will be completely saturated with water, and the level of water in the bucket will stop falling. However, water from the bucket is still evaporating. What is happening is that molecules of water in the air will occasionally hit the surface of the water and condense back into the liquid water, and this occurs at the same rate at which water evaporates from the bucket. This is an example of dynamic equilibrium, because the rate of evaporation equals the rate of condensation.

Answer 4

Dynamic Equilibrium may be defined as ; -
The rate of the Forward Reaction is the same as the Backward(Reverse) Reaction.

An example is the Haber Process for the production of ammonia.
Another example is the esterification reaction between a carboxylic acid and an alcohol to produce an ester and water.

Answer 5

Basically, if a reaction is reversible, when the reaction starts it immediately begins to reverse. The reaction will continue to go until "equilibrium" in which the reaction is reacting at the same rate forward as well as backward, giving you a point where no new quantiles of either products or reactants are being formed. The are actually new products and reactants being formed but since they are in equilibrium it's always at the same rate. hope that helps.

Answer 6

To put it simply, dynamic equilibium, is when 2 states of a substance (e.g. liquid water and water vapour) exist in equilibrium, in a closed system (where no products or reactants escape), of which the substance can enter both states freely (so the reaction is reversible).

The key thing is that it is dynamic - meaning changing.

Hence on a macromolecular level (i.e. looking at the liquid water and the vapour as a whole), nothing seems to be changing.

But on a molecular level, (i.e. individual molecules), the same amount of water vapour molecules enter the liquid phases as those which turn into vapour molecules.

Think of a bottle filled with cola:

- The lid is screwed on hence a closed system
- CO2 can exist in gas form or dissolved in solution hence reaction is reversible.
- Just looking at it, nothing seems to be changing (macromolecular)
- However on a molecular scale, the same amount of CO2 leaves the solution as that which enters it.
- Hence the equilibrium is dynamic.

Answer 7

Dynamic equilibrium is the term given for a reversible reaction in a closed system, ( where the temperature and pressure remains constant), when the rate of product formation equals the rate of reactant formation.

For example:
hydrogen + iodine <---> hydrogen iodide

H2 (g) + I2 (g) <---> 2HI (g)

Hence, at a macro molecular level, no apparent changes appear to take place in the container, however, at the microscopic level, the molecules are continuously reacting, and in this case HI is forming H2 and I2, while H2 and I2 are also constantly reacting to form HI.

Answer 8

I had that question in my a-level question paper!

Dynamic equilibrium is when the forward reaction = back ward reaction, and there is no change in concentrations.

Both points need to be expressed .. for a full definition

Examples ... god there are loads
H2 + I2 <--> 2HI where <--> = equilibrium

Hope this helps

Answer 9

I don't know the exact definition but it's when two different solutions are in balance. An example is like when you take a bacid medicine when your stomach produces too much acid (for a stomache ache) to nuetralize some of the acid.

Answer 10

http://dbhs.wvusd.k12.ca.us/webdocs/Equilibrium/Dynamic-Equilibrium.html