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What occurs when some substances change chemically to other substances?

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asked Dec 28, 2024 in Science by OfeliaDelmon (1.8k points)

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answered Dec 28, 2024 by CedricNicker (1.9k points)

chemical reaction

A chemical reaction occurs when some substances change chemically to other substances. Chemical reactions are represented by chemical equations.

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Determine the standard enthalpy of formation for hydrogen chloride gas using the following data:H2(g) + Cl2(g) → 2HCl(g) ΔH = -184.6 kJ/molH2(g) + 1/2O2(g) → H2O(l) ΔH = -285.8 kJ/mol2HCl(g) + O2(g) → 2ClO(g) + H2O(l) ΔH = -518.2 kJ/mol Note: The standard enthalpy of formation for a compound is the change in enthalpy that occurs when one mole of the compound is formed from its constituent elements, with all substances in their standard state at a given temperature (usually 25°C) and pressure (usually 1 atm).

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What occurs when some substances change chemically to other substances?

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