Equilibrium

Chemical equilibrium

By Sandra Iturbe

CHEMICAL EQUILIBRIUM

​Reversible reactions

Are the ones in which the products, as soon as they are formed, react to produce the original reactants.

At equilibrium the two opposing reactions go on at equal rates, or velocities and hence there is no net change in the amounts of substances involved.

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For a given reaction, at some specified condition of temperature and pressure, the ratio of the amounts of products and reactants present at equilibrium, is a constant, designated the equilibrium constant of the reaction and represented by the symbol K.​

Multiple Choice

The "Kc" expression refers to...

• The equilibrium in a reaction

• The amount of products

• The amount of reactants

• An irreversible reaction

Multiple Select

To calculate Kc, the reaction ...

• Must be balanced

• Must be reversible

• Must be irreversible

​Calculate Kc

• Balance the equation.

• Write in square brackets products/reactants​.

• Use the coefficients as exponents.

• Calculate.​

Fill in the Blank

Based on the equation calculate the equilibrium constant with the provided data.