Moira's STEM Classroom

  Aldehydes and Ketones Aldehydes and ketones play significant roles in agriculture, contributing to both agrochemical production and preservation processes such as tanning and embalming. Aromatic aldehydes like benzaldehyde and cinnamaldehyde are responsible for the distinct fragrances and flavors in plants, with benzaldehyde being widely used in the perfumery industry. Additionally, aldehyde compounds serve as natural defense mechanisms in plants, protecting them from environmental stressors and herbivores. Ketones, particularly 2-ketones like  2-nonanone  and  2-tridecanone , have been shown to stimulate plant growth and enhance antioxidant systems when delivered through solid lipid nanoparticles, as seen in crops like lettuce ( Lactuca sativa ). Moreover, aldehydes contribute to the characteristic aromas of plants; for instance,  cis-3-hexenal  imparts the fresh grassy scent of newly mowed lawns, while benzaldehyde and cinnamaldehyde are used as flavori...

Alcohols Alcohols, particularly in the form of ethanol, are relevant to agriculture through their use as biofuels, their influence on crop production and livestock feeding, and the safety implications for pesticide handling. Additionally, the environmental impact of alcohol production raises concerns about resource allocation and food security. As agricultural practices evolve, understanding these dynamics is crucial for promoting sustainable farming and ensuring the safety of agricultural workers. Alcohols  are a significant class of organic compounds characterized by the presence of one or more hydroxyl (-OH) functional groups attached to carbon atoms.  Structure of Alcohols Alcohols can be represented by the general formula  R-OH , where  R  is an alkyl group. The hydroxyl group (-OH) is the defining feature of alcohols, and its position on the carbon chain determines the classification of the alcohol as primary, secondary, or tertiary: Primary Alcohols (1°) ...

  Alkynes Alkynes are currently relevant to agriculture through their use in agrochemical synthesis and as markers for studying diet composition in livestock. With ongoing research, their potential applications may expand further in the future. Alkynes  are a class of unsaturated hydrocarbons that contain at least one carbon-carbon triple bond (C≡C). They are the second most saturated class of hydrocarbons after alkanes.  Learning Outcomes Describe the structure and properties of alkynes, alcohols and ethers; Apply IUPAC nomenclature to alkynes, alcohols and ethers; Understand and identify types of isomerism; and Explain the reactivity and common reactions of alkynes, alcohols and ethers. General Formula The general formula for alkynes is C n H 2n-2 , where n is the number of carbon atoms in the molecule. For example, the molecular formula of ethyne (acetylene) is  C 2 H 2 . Structure The carbon atoms involved in the triple bond are  sp -hybridized, resulting in...

Hydrocarbons - Alkenes Alkenes  are a class of unsaturated hydrocarbons characterized by the presence of at least one  carbon-carbon double bond (C=C) . They are significant in organic chemistry due to their unique properties and reactivity. Here’s a detailed overview of alkenes, including their general formula, physical and chemical properties, common reactions, structure, and isomerism. Learning Outcomes Identify and illustrate common organic molecules and functional groups; Understand basic concepts of organic chemistry; Describe structure, properties, and isomerism in alkenes; Apply nomenclature rules for alkenes; and Explain hybridization, molecular geometry in organic compounds, and the reactivity and common reactions of alkenes. General Formula The general formula for alkenes is  C n H 2n , where  n  is the number of carbon atoms. This formula indicates that alkenes have two fewer hydrogen atoms than the corresponding alkanes (which have the general formu...