Hydrogen chloride gas, HCl , reacts with ammonia gas, $$$\mathrm{NH}_{3}$$$, to form solid ammonium chloride. The apparatus is set up as shown. After a few minutes, a white cloud of solid ammonium chloride forms where the two gases meet. The experiment is repeated using hydrogen bromide gas, HBr , in place of hydrogen chloride. How far along the tube does the white cloud of solid ammonium bromide form?

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_s24_qp_23 Year：2024 Question No：2

Answer:

Knowledge points:

5.1.1. State that an exothermic reaction transfers thermal energy to the surroundings leading to an increase in the temperature of the surroundings

5.1.2. State that an endothermic reaction takes in thermal energy from the surroundings leading to a decrease in the temperature of the surroundings

5.1.3. Interpret reaction pathway diagrams showing exothermic and endothermic reactions

5.1.4. State that the transfer of thermal energy during a reaction is called the enthalpy change

5.1.5. Define activation energy

5.1.6.1. reactants

5.1.6.2. products

5.1.6.3. enthalpy change of the reaction

5.1.6.4. activation energy

5.1.7. State that bond breaking is an endothermic process and bond making is an exothermic process and explain the enthalpy change of a reaction in terms of bond breaking and bond making

Answer:

Knowledge points:

Solution:

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