PRAKTIKUM TERMOKIMIA Oleh Aisyah Sinta Balqis Kelas 11 MIPA 1

Summary

In this engaging video, Aisyah Balqis from MAN 1 Kota Bogor conducts a series of thermochemistry experiments to illustrate exothermic and endothermic reactions. The first experiment demonstrates how citric acid and detergent affect temperature, revealing the cooling and warming effects of these reactions. The second experiment shows a clever method to retrieve a coin using a candle and glass, highlighting gas pressure changes. Finally, the third experiment combines vinegar, dish soap, and yeast to create a warm reaction, emphasizing the heat generated. Each experiment effectively illustrates key thermochemical concepts in an accessible way.

Takeaways

• 😀 Exothermic reactions release heat, causing the surroundings to increase in temperature.
• 😀 Endothermic reactions absorb heat, leading to a decrease in the temperature of the surroundings.
• 😀 Exothermic reactions have a negative enthalpy value, while endothermic reactions have a positive enthalpy value.
• 😀 In the first experiment, adding citric acid to water resulted in a cold sensation, indicating an endothermic process.
• 😀 The second experiment demonstrated how to extract a coin from water using a candle and a glass, showcasing gas pressure principles.
• 😀 The water was drawn into the glass due to the candle flame heating the air, which created a vacuum effect.
• 😀 The third experiment involved mixing vinegar and dish soap to create a chemical reaction that generated heat.
• 😀 Adding yeast to warm water resulted in a noticeable temperature increase, indicating an exothermic reaction.
• 😀 Each experiment highlighted the principles of thermochemistry through practical demonstrations.
• 😀 The presenter concluded with an invitation for viewers to learn and experiment further in thermochemistry.

Q & A

What is the definition of an exothermic reaction?

An exothermic reaction is one that releases heat to the surroundings, causing the temperature of the surroundings to increase.

What characterizes an endothermic reaction?

An endothermic reaction absorbs heat from the surroundings, leading to a decrease in the temperature of the surroundings.

What is the enthalpy value of an exothermic reaction?

The enthalpy value of an exothermic reaction is negative.

What happens to the temperature of the system during an endothermic reaction?

During an endothermic reaction, the temperature of the system increases while the temperature of the surroundings decreases.

What materials are used in the first experiment?

The first experiment uses citric acid (sitrun) and detergent mixed with water.

What observation is made when citric acid is dissolved in water?

The walls of the glass containing the citric acid become cold due to the absorption of heat from the surroundings.

How is the coin removed from the water without touching it in the second experiment?

By placing a lit candle in the center of the plate and covering it with a glass, the water is drawn into the glass, allowing the coin to be retrieved.

What is the main observation in the third experiment involving vinegar and soap?

When yeast is added to the mixture of vinegar and soap, the sides of the bottle feel warm due to the heat released from the reaction.

What is the significance of the temperature changes observed in these experiments?

The temperature changes illustrate the concepts of exothermic and endothermic reactions, showcasing how energy is transferred between the system and the surroundings.

What is the final takeaway from the experiments presented in the transcript?

The experiments demonstrate practical examples of thermochemical reactions, helping to understand the concepts of heat release and absorption in chemical reactions.