Chem writing assigment part 1 PDF

Preview

Summary

Download Chem writing assigment part 1 PDF

Description

The boiling point of a molecule refers to the lowest temperature at which the phase transfer from liquid to gas occurs (Burrows, Holman & Parsons 2017). Knowing the boiling point of an organic compound is essential as it can indicate the structural and physical properties of the compound (Wypych & Wypych 2015). There are various components that can affect the boiling point, this essay will concentrate on the intermolecular forces that a compound has and how that affects the boiling point of a compound. Discussing the two molecules 2-methylpropanoic acid and 3-methyl-2butanone. 2-methylpropanoic acid known as Isobutyric acid is a carboxylic acid with structural formula (CH₃)₂CHCOOH (Baraniuk, R 2018). It is an isomer of n-butyric acid and has a molar mass of 88.11 g/mo. In comparison, 3-Methyl-2-butanone is a ketone and solvent with a structural formula of C5H10O and molar mass of 86.13 g/mol. Both have a similar molar mass which indicates that the boiling points depend on the compound with stronger intermolecular forces. The molecules would have nearly identical dispersion forces between them yet the bonding between the functional groups is drastically different.

Results

Molecules

Structure

Boiling point(°C) ATM ( boiling point at 1 atmosphere)

154.4 2-methylpropanoic

3-Methyl-2-Butanone

92.2

Table: Comparability of 2-methylpropanoic acid and 3-Methyl-2-Butanone molecules This table shows the boiling points of 2-methylpropanoic acid and 3-Methyl-2-Butanone. With 2methylpropanoic acid having a much higher boiling point than the 3-methyl-2-butanone. This has happened on the grounds that the 2-methylpropanoic acid functional group is a carboxylic acid which is made of hydrogen bonds. Contrastingly, 3-methyl-2-butanone having a lower boiling point due to its functional group is a ketone that is made of dipole-dipole forces. As a result that hydrogen bonds have a stronger intermolecular force than dipole-dipole forces, this implies that it would involve more active vitality to isolate the bonds of the 2-methylpropanoic acid in contrast to the 3-methyl-2-butanone. Thus, 2-methylpropanoic acid has a higher boiling point than 3-methyl-2-butanone as a result of the occurrence of a stronger intermolecular force.

References: 1. , 2018, Types of interactions, Chemistry 301, viewed August 21 2020, h0ps://ch301.cm.utexas.edu/section2.php?target=imfs/forces/forces-a0raction-all.php 2. Clark, J, 2003, Introducing Aldehydes and Ketones, viewed 21 August 2020, h0ps://www.chemguide.co.uk/organicprops/carbonyls/background.html 3. Clark, J & Pietri, J, 2018a, Hydrogen Bonding, Chemistry LibreTexts, viewed 21 August 2020, h0ps://chem.libretexts.org/Textbook_Maps/Physical_and_Theoretical_Chemistry_Textbook _Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry) \Physical_Properties_of_Ma0er/Atomic_and_Molecular_Properties/Intermolecular_Forces/ Speci...