8.314 J/mol

The correlation, denoted by r, measures the amount of linear association between two variables. The R-squared value, denoted by R 2, is the square of the correlation. It measures the proportion of variation in the dependent variable that can be attributed to the independent variable.

Chemically, an amino acid is a molecule that has a carboxylic acid group and an amine group that are each attached to a carbon atom called the α carbon. Each of the 20 amino acids has a specific side chain, known as an R group, that is also attached to the α carbon.

Functional groups play a significant role in directing and controlling organic reactions. In organic chemistry, the most common functional groups are carbonyls (C=O), alcohols (-OH), carboxylic acids (CO2H), esters (CO2R), and amines (NH2).

Hydroxyl, sulfhydryl, carbonyl, carboxyl, amino and phosphate groups.

carboxyl

Compared to amines, amides are very weak bases. While the conjugate acid of an amine has a pKa of about 9.5, the conjugate acid of an amide has a pKa around −0.5. Therefore, amides don’t have as clearly noticeable acid–base properties in water.

Acidity of Amines The same factors that decreased the basicity of amines increase their acidity.

Amide groups have the general chemical formula CO-NH.

Amine Answers The amide ion is the strongest base since it has two pairs of non-bonding electrons (more electron-electron repulsion) compared to ammonia which only has one. Ammonium is not basic since it has no lone pair to donate as a base.

With a pKa of around 16–19, they are, in general, slightly weaker acids than water. With strong bases such as sodium hydride or sodium they form salts called alkoxides, with the general formula RO− M+. The acidity of alcohols is strongly affected by solvation. In the gas phase, alcohols are more acidic than in water.

Phenylamine has the structure: The lone pair on the nitrogen touches the delocalised ring electrons . . . . . . and becomes delocalised with them: Taken together – the lack of intense charge around the nitrogen, and the need to break some delocalisation – this means that phenylamine is a very weak base indeed.

Nitrogen is the chemical element with the symbol N and atomic number 7….