Preview - Energy In Chemical Reactions

Exploring the Simulation

Experiment with the simulation by observing two different chemical processes.

  • The separation of the ionic compound potassium iodide (KI) in water:

KI (s) → K+ (aq) + I− (aq)

  • The synthesis of calcium hydroxide, Ca(OH)2 , and subsequent production of hydrogen gas when solid calcium metal (Ca) is added to water:

Ca(s) + 2 H2O (l)→ Ca(OH)2 (aq) + H2 (g)

Begin by hitting "setup” and then “run/pause”. In order to monitor the temperature of your experiment you will need a sensor in the container. Press “place sensor” in order to add a sensor inside your container with your cursor.

In order to observe the ionic compound separate in water, you will need to press the "Add KI" button; to observe the synthesis of calcium hydroxide and production of hydrogen gas, you will need to press the "Add Ca" button.

Questions

Please answer the questions below.

The radius of a sensor is adjustable. What is the optimum size of a sensor to get the most accurate reading of the inside of the container? State your answer and explain the reason for your choice of size.

Identify the separation of the ionic compound potassium iodide (KI) in water as endothermic or exothermic. Cite your observed temperature change in the graph and particle speed in the simulation as evidence for your choice.

Is the synthesis of calcium hydroxide, Ca(OH)2 , and subsequent production of hydrogen gas when solid calcium metal (Ca) is added to water endothermic or exothermic? Cite your observed temperature change in the graph and particle speed in the simulation as evidence for your choice.

Notes

These notes will appear on every page in this lesson so feel free to put anything here you'd like to keep track of.