Are the words in brackets correct? If not, correct it.
1. Aldehydes and ketones are [less] polar than hydrocarbons.
I think aldehydes and ketones are polar, so should I change it to "more"?
2. [Hydrocarbons] have stronger intermolecular forces than aldehydes and ketones.
I had no ideas about that.
Thanks for helping out.
Your answer to #1 is correct and you should change it to "more". If you think about #1, you should know that #2 is false. Think about it. If aldehydes and ketones are more polar molecules than alkanes, then wouldn't aldehydes and ketones have stronger intermolecular forces.
For #2, should I change "hydrocarbons" to "alcohols"?
Thank you.
http://www.chemguide.co.uk/organicprops/carbonyls/background.html
1. Aldehydes and ketones are actually more polar than hydrocarbons. To determine the polarity of a molecule, you can look at the electronegativity difference between the atoms involved. Oxygen, which is present in aldehydes and ketones, is highly electronegative, meaning it attracts electrons more strongly than carbon. As a result, the oxygen atom in aldehydes and ketones creates a partial negative charge, while the carbon atom carries a partial positive charge. This uneven distribution of charge makes aldehydes and ketones polar molecules. Therefore, the correct statement would be: "Aldehydes and ketones are more polar than hydrocarbons."
2. The correct version of the statement would be: "Aldehydes and ketones have stronger intermolecular forces than hydrocarbons." Intermolecular forces are attractions between molecules, and they influence the physical properties of substances. In the case of aldehydes and ketones, the presence of the oxygen atom and the polarity of the molecules allow for dipole-dipole interactions. These interactions are stronger than the London dispersion forces, which are the primary intermolecular forces in hydrocarbons. Consequently, aldehydes and ketones exhibit stronger intermolecular forces compared to hydrocarbons.