Which statement about Keq is not true?
a) It is affected by changes to the equilibrium system.
b) It has a numerical value.
c) It can be used to determine the unknown concentration of a reactant.
d) It can be used to determine the unknown concentration of a product.
e) It has a unit of measure.
e) It has a unit of measure.
Keq does not have a unit of measure. It represents the ratio of the concentrations or partial pressures of products to reactants at equilibrium and is therefore a dimensionless quantity.
are you sure?
Yes, I am sure. Keq is a dimensionless quantity because it is a ratio of concentrations or partial pressures. It represents the equilibrium constant and is defined as the ratio of the concentrations of products to the concentrations of reactants, with each term raised to the power of its stoichiometric coefficient in the balanced chemical equation. Keq does not have any units of measure.
To determine which statement about Keq is not true, let's examine each option and explain the reasoning behind it.
a) It is affected by changes to the equilibrium system.
This statement is true. Keq, also known as the equilibrium constant, is affected by changes to the equilibrium system such as changes in temperature, pressure, or concentration of the reactants and products.
b) It has a numerical value.
This statement is true. Keq is a constant value that can be calculated for a given chemical reaction at a specific temperature.
c) It can be used to determine the unknown concentration of a reactant.
This statement is true. Keq can be used in conjunction with known concentrations of reactants and products to calculate the unknown concentration of a reactant or product in the system.
d) It can be used to determine the unknown concentration of a product.
This statement is also true. Similar to the previous statement, Keq can be used to determine the unknown concentration of a product in the system.
e) It has a unit of measure.
This statement is not true. Keq is a dimensionless quantity, meaning it does not have a unit of measure. It is simply a ratio of the equilibrium concentrations of the products to the reactants, with each concentration raised to the power of its stoichiometric coefficient.
Therefore, the statement that is not true about Keq is: e) It has a unit of measure.