the goal:

Explanation of thermal energy transformations.

Materials and tools:

Magnesium sulfate - Calcium chloride - Distilled water - Glass beaker - Thermometer - Scale - Glass pipette - Spoon.

Steps:

1- Fill the glass beaker with 100 ml of water and record the temperature using the thermometer.

2- Weigh 40 grams of anhydrous calcium chloride and add it to the beaker.

3- Use the glass stirring rod to dissolve the powder and observe the change in temperature.

4- Repeat the previous steps in another beaker but using Epsom salt (magnesium sulfate heptahydrate), and observe what happens.

Note:

We observe an increase in temperature of the solution in the first beaker after adding calcium chloride, and a decrease in temperature in the second beaker after adding magnesium sulfate. 

Conclusion:

Energy transformation occurs when adding anhydrous calcium chloride solution due to the release of thermal energy, and when adding magnesium sulfate, energy is absorbed in the form of heat.

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