Question

ПОЖАЛУЙСТА СРОЧНО! Определите тип термохимических реакций:Fe (тв) + О2 (г)→ Fe3О4 (тв) + 276 кДж _________________________________CuО (тв) + NО2 (г) + О2 (г) → Cu(NО3)2 (тв) - 440 кДж _________________________Cl2 (г) + F2 (г) → СlF5 (г) – Q _________________________Al (тв) + О2 (г)→ Al2О3 (тв) + Q________________________​

Answer 1

1. Экзотермическая реакция

2. Эндотермическая реакция

3. Эндотермическая реакция

4. Экзотермическая реакция

Answer 2

Types of Thermochemical Reactions

Thermochemical reactions involve the exchange of heat energy during a chemical reaction. Based on the given reactions, we can determine the types of thermochemical reactions involved. Let's analyze each reaction:

1. Fe (s) + O2 (g) → Fe3O4 (s) - This reaction represents the formation of iron(II,III) oxide (Fe3O4) from iron (Fe) and oxygen (O2) gas. - Since the reaction releases 276 kJ of heat energy, it is an exothermic reaction. Exothermic reactions release heat energy to the surroundings.

2. CuO (s) + NO2 (g) + O2 (g) → Cu(NO3)2 (s) - This reaction represents the formation of copper(II) nitrate (Cu(NO3)2) from copper(II) oxide (CuO), nitrogen dioxide (NO2) gas, and oxygen (O2) gas. - Since the reaction releases 440 kJ of heat energy, it is also an exothermic reaction.

3. Cl2 (g) + F2 (g) → ClF5 (g) - This reaction represents the formation of chlorine pentafluoride (ClF5) from chlorine (Cl2) gas and fluorine (F2) gas. - The given reaction does not specify whether heat is released or absorbed (Q is not provided). Therefore, we cannot determine if it is an exothermic or endothermic reaction based on the given information.

4. Al (s) + O2 (g) → Al2O3 (s) - This reaction represents the formation of aluminum oxide (Al2O3) from aluminum (Al) and oxygen (O2) gas. - The given reaction does not specify whether heat is released or absorbed (Q is not provided). Therefore, we cannot determine if it is an exothermic or endothermic reaction based on the given information.

To summarize: - The reactions involving the formation of Fe3O4 and Cu(NO3)2 are exothermic reactions because they release heat energy. - The reactions involving the formation of ClF5 and Al2O3 do not provide information about the heat exchange, so we cannot determine their type based on the given information.

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