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Latrobe.edu.au CHM101 – ESSENTIALS OF CHEMISTRY Scenario based problems 1 MODULE 3 SCENARIO-BASED PROBLEM Food as Energy – Fuel for Life Not only do we use energy for transportation, heating, lights, and countless devices but we also need it to power our bodies. The food we eat provides energy for metabolism and physical activity. Aerobic respiration involves oxidation of the nutrient molecule to produce carbon dioxide and water. It is the same overall reaction as combustion but proceeds by a very different pathway. The chemical energy released is harnessed to produce adenosine triphosphate (ATP), commonly described as the body’s energy “currency”. One molecule of myristic acid for example makes over 100 molecules of ATP. Recently, controversy has erupted over whether fat or sugar is the worst culprit in the obesity epidemic. It is a complex story, but one property of nutrients that can be well determined is their energy content. In the first part of this scenario, your task is to assess which has a higher energy content, sugar or fat. These generic classes of food will be represented by sucrose (table sugar) and myristic acid, the most abundant saturated fatty acid in food. You will use concepts of physical chemistry to examine aspects of the energy content of food, how much oxygen is required for respiration, how that oxygen is transported, and the chemical kinetic factors that determine how readily reactions occur. Sucrose, C12H22O11Myristic acid, C14H28O2Q1. What functional groups are present in each molecule?
Latrobe.edu.au CHM101 – ESSENTIALS OF CHEMISTRY Scenario based problems 2 Q2.Write balanced chemical equation including the states of matter (s, l, g, aq) for the aerobic respiration reaction of sucrose, showing how it reacts with oxygen to produce energy?