How do you calculate selectivity in chemistry?
Selectivity (%)= mol desired product / (mol starting compound-mol starting compound left after reaction)*100.
What is selectivity equation?
Selectivity of D/U=Total molar rate of production of Desired product Total molar rate of production of Undesired product=RDRU.
What is selectivity in a chemical reaction?
DEFINITION. The selectivity of a reaction is the ratio of the desired product formed (in moles) to the undesired product formed (in moles).
What is the selectivity in chemistry?
Selectivity is the discrimination shown by a reagent in competitive attack on two or more substrates or on two or more positions in the same substrate. It is quantitatively expressed by ratios of rate constants of the competing reactions, or by the logarithms of these ratios.
Is selectivity the same as yield?
In chemical reaction engineering, “yield”, “conversion” and “selectivity” are terms used to describe ratios of how much of a reactant has reacted—conversion, how much of a desired product was formed—yield, and how much desired product was formed in ratio to the undesired product—selectivity, represented as X,S, and Y.
What is difference between yield and selectivity?
What is the types of selectivity?
There are three types of selectivity possible for any synthesis: (i) Chemoselectivity is deciding which group reacts. (ii) Regioselectivity is where the reaction takes place in that group. (iii) Stereoselectivity is how the group reacts with respect to the stereochemistry of the product.
What is selectivity of drug action?
Selectivity is the degree to which a drug acts on a given site relative to other sites. Relatively nonselective drugs affect many different tissues or organs. For example, atropine, a drug given to relax muscles in the digestive tract, may also relax muscles in the eyes and in the respiratory tract.
Which is the ultimate of selectivity in chemistry?
IUPAC has earlier stated that “specificity is the ultimate of selectivity”. The desire to avoid the term specificity has been expressed as “Sometimes the term specificity is used. This usage suggests that no component other than the analyte contributes to the result.
How to balance the chemical equations in Excel?
Enter the equation directly into the Balancing Chemical Equations Calculator to balance the given chemical equations. You can also enter the equations by clicking the elements in the table given in the chemical equation balancer. Chemical equations must be balanced with respect to all atoms and the atoms must exist in real compounds.
How are catalysts used to improve reaction selectivity?
Catalysts are substances that can accelerate chemical reactions or improve reaction selectivity without consuming themselves [1, 2 ]. Currently, catalysts are widely used in organic synthesis, environmental protection, and energy related systems [ 3–8 ], which are of direct relevance to many aspects of our daily life.
Where does the word ” selectivity ” come from?
Semantic aspects. Selectivity has its origin in seligo, which is Latin for “to choose” or “to select”. Thus selective can mean “tending to choose carefully” and selectivity, “the state or quality of being selective”.