In this case, the thought of telling the person how you feel about them, or letting it be known, causes discomfort and makes you cover it up. 8. Rationalization is one of the most common defense mechanisms. b)  It is not the formation of a single substance, so it is not a formation reaction. 14. 14. What is the enthalpy of reaction for this chemical equation? A cause of Reaction Formation is when a person seeks to cover up something unacceptable by adopting an opposite stance. 4. 6. Enthalpies of formation are used to determine the enthalpy change of any given reaction. Which of the following are proper formation reactions? b)  2 HBr(g) + Cl2(g) → 2 HCl(g) + Br2(ℓ). When someone has racist thoughts they are ashamed of, so they are excessively nice to people of color, or when someone who has homosexual urges loudly denounces homosexuality, these can be examples of reaction formation. Write formation reactions for each of the following. For example the gay person who has heterosexually promiscuous may be concealing their homosexual reality. 12. You may have noticed in all our examples that we change the signs on all the enthalpies of formation of the reactants, and we don’t change the signs on the enthalpies of formation of the products. An example may be found in a case of hysterical amnesia, in which the victim has performed or witnessed some disturbing act and then completely forgotten the act itself and the circumstances surrounding it. Use enthalpies of formation to determine the enthalpy of reaction. There is an easier way. Is this a proper formation reaction? We are all familiar with examples of this apparent contradiction. Another example of reaction formation is the angry person who behaves with exaggerated calm and courtesy. can be written as a combination of formation reactions. The product is one mole of substance, which may require that coefficients on the reactant side be fractional (a change from our normal insistence that all coefficients be whole numbers). —is not in a standard state because the coefficient on the product is 2; for a proper formation reaction, only one mole of product is formed. No fancy or fad diets are needed; maintaining an ideal body weight is a straightforward matter of thermochemistry—pure and simple. 9. The immigrant who becomes more native than … Similarly, if we want to lose weight, we need to expend an extra 3,500 Cal than we ingest to lose 1 lb of weight. For example the gay person who has heterosexually promiscuous may be concealing their homosexual reality. We are simply using Hess’s law in combining the ΔHf values of the formation reactions. Solution. Write this reaction in terms of formation reactions. A daily diet of 2,000 Cal is actually 2,000,000 cal, or over 8,000,000 J, of energy. For example, the formation reaction for methane (CH4) is, The formation reaction for carbon dioxide (CO2) is, In both cases, one of the elements is a diatomic molecule because that is the standard state for that particular element. Data can be found in Table 7.2 “Enthalpies of Formation for Various Substances”. 17. There will be three formation reactions. If our diet consists solely of fats, we need only about 220 g of food—less than a half pound. Table 7.2 Enthalpies of Formation for Various Substances. If we eat more calories than our body uses, we gain weight—about 1 lb of weight for every additional 3,500 Cal we ingest. Thus, for the formation of FeO(s). This is not a proper formation reaction because oxygen is not written as a diatomic molecule. There will be three formation reactions. For example, a subject vulnerable to abhorrent sexual desire may preach against such practices in the community. Water has no caloric value in the diet, so any water in the diet is calorically useless. Show that the reaction. If it is not a formation reaction, explain why. Nutritionists typically generalize the Calorie content of foods by separating it into the three main food types: proteins, carbohydrates, and fats. Why do people behave this way? One mole of a substance is produced, but it is produced from two other compounds, not its elements. In mathematical terms. Determine the enthalpy change of this reaction. We also multiply the enthalpies of formation of any substance by its coefficient—technically, even when it is just 1. Formation reactions and their enthalpies are important because these are the thermochemical data that are tabulated for any chemical reaction. We can write it in terms of the (reverse) formation reaction of NO2 and the formation reaction of N2O4: We must multiply the first reaction by 2 to get the correct overall balanced equation. 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