Heat and Enthalpy Dialogue

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Heat flow and enthalpy concepts

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Fan Li Kien De Vera

Filipinas

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Heat and Enthalpy DialogueVersión en línea Heat flow and enthalpy concepts por Fan Li Kien De Vera Teacher The temperature rises from 25°C to 38°C. Student The reaction mixture shows a temperature change of +13°C. Teacher The temperature falls from 27°C to 19°C. Student The reaction mixture shows a temperature change of −8°C. Teacher Hydrochloric acid and sodium hydroxide are mixed, and the container becomes warm. Student Thermal energy flows from the reacting system to the surroundings. Teacher Ammonium nitrate dissolves in water, and the container becomes cold. Student Thermal energy flows from the surroundings into the dissolving system. Teacher The products contain less chemical energy than the reactants. Student The difference between the reactants’ and products’ energy is released. Teacher The products contain more chemical energy than the reactants. Student Energy from the surroundings is stored as chemical energy in the products. Teacher A reaction has an enthalpy change of ΔH = −125 kJ/mol. Student The system loses 125 kJ of energy for every mole that reacts. Teacher A reaction has an enthalpy change of ΔH = +75 kJ/mol. Student The system gains 75 kJ of energy for every mole that reacts.

Heat and Enthalpy DialogueVersión en línea

Heat flow and enthalpy concepts

por Fan Li Kien De Vera

Teacher

The temperature rises from 25°C to 38°C.

Student

The reaction mixture shows a temperature change of +13°C.

Teacher

The temperature falls from 27°C to 19°C.

Student

The reaction mixture shows a temperature change of −8°C.

Teacher

Hydrochloric acid and sodium hydroxide are mixed, and the container becomes warm.

Student

Thermal energy flows from the reacting system to the surroundings.

Teacher

Ammonium nitrate dissolves in water, and the container becomes cold.

Student

Thermal energy flows from the surroundings into the dissolving system.

Teacher

The products contain less chemical energy than the reactants.

Student

The difference between the reactants’ and products’ energy is released.

Teacher

The products contain more chemical energy than the reactants.

Student

Energy from the surroundings is stored as chemical energy in the products.

Teacher

A reaction has an enthalpy change of ΔH = −125 kJ/mol.

Student

The system loses 125 kJ of energy for every mole that reacts.

Teacher

A reaction has an enthalpy change of ΔH = +75 kJ/mol.

Student

The system gains 75 kJ of energy for every mole that reacts.

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Heat and Enthalpy Dialogue

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Heat and Enthalpy DialogueVersión en línea

por Fan Li Kien De Vera

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