Ch.9 - Thermochemistry: Chemical Energy

McMurry8th EditionChemistryISBN: 9781292336145Non è quello che usi tu?Cambia libro di testo

McMurry 8th Edition

Ch.9 - Thermochemistry: Chemical Energy

Problema 40a

Capitolo 9, Problema 40a

The following reaction is exothermic:
(a) Write a balanced equation for the reaction (red spheres represent A atoms and ivory spheres represent B atoms)

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Identify the reactants and products based on the description of the spheres.

Count the number of each type of atom on both sides of the reaction to ensure they are equal.

Write the chemical formula for the reactants and products using the identified atoms.

Balance the equation by adjusting coefficients to ensure the same number of each type of atom on both sides.

Verify that the equation is balanced and represents the exothermic reaction correctly.

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Exothermic Reactions

Exothermic reactions are chemical processes that release energy, usually in the form of heat, to the surroundings. This occurs when the total energy of the products is lower than that of the reactants, resulting in a net release of energy. Understanding this concept is crucial for predicting temperature changes and the feasibility of reactions.

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02:38

Endothermic & Exothermic Reactions

Balancing Chemical Equations

Balancing chemical equations involves ensuring that the number of atoms for each element is the same on both sides of the equation. This is based on the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. A balanced equation accurately represents the stoichiometry of the reaction.

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01:32

Balancing Chemical Equations

Molecular Representation

Molecular representation uses symbols and models to depict the structure and composition of molecules. In the context of the question, red and ivory spheres represent different atoms, allowing for a visual understanding of the reactants and products involved in the reaction. This representation aids in grasping the molecular interactions during the reaction.

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02:38

Molecular Polarity

Pratica correlata

Domanda del libro di testo

The following reaction is exothermic: (c) Is the reaction likely to be spontaneous at lower temperatures only, at higher temperatures only, or at all temperatures?

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The reaction of A with B to give D proceeds in two steps: (1) A + B → C ΔH° = -20 kJ (2) C + B → D ΔH° = +50 kJ (3) A + 2B → D ΔH° = ? (b) What is the value of ΔH° for the overall reaction A + 2 B → D ΔH° = ?

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Domanda del libro di testo

The reaction of A with B to give D proceeds in two steps: (1) A + B → C ΔH° = -20 kJ (2) C + B → D ΔH° = +50 kJ (3) A + 2B → D ΔH° = ? (a) Which Hess's law diagram represents the reaction steps and the overall reaction? Diagram 1 Diagram 2

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Domanda del libro di testo

The following reaction of A₃ molecules is spontaneous. (a) Write a balanced equation for the reaction.

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Domanda del libro di testo

Acetylene, C2H2, reacts with H2 in two steps to yield ethane, CH3CH3: (1) HC?CH + H2 → H2C?CH2 ΔH° = -175.1 kJ (2) H2C?CH2 + H2 → CH3CH3 ΔH° = -136.3 kJ Which arrow (a–c) in the Hess's law diagram corresponds to which step, an2d which a2rrow cor2responds to the net reaction? Where are the reactants located on the diagram, and where are the products located?

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