Praktikum Hukum Kekekalan Massa_Pembakaran Pita Magnesium @dewikimia9013

Summary

This video demonstrates a hands-on experiment using magnesium ribbon and a spirit burner to showcase the principle of mass conservation. The process includes weighing materials before and after burning magnesium in open air, noting the change in mass. The video explains the application of Lavoisier's law of mass conservation, illustrating that mass remains constant before and after the reaction, even though some energy or material may go unmeasured. The experiment results in a mass reduction, emphasizing the core concept that the total mass is conserved during chemical reactions.

Takeaways

• 😀 The script describes an experiment involving magnesium ribbon and a digital scale.
• 😀 The experiment begins with weighing an empty sheet of paper, which weighs 46 grams.
• 😀 The magnesium ribbon is weighed, which increases the total weight to 56 grams.
• 😀 The spirit burner is ignited before the magnesium ribbon is burned.
• 😀 The experimenter is advised to wear protective glasses to shield from the intense light of the burning magnesium.
• 😀 The magnesium ribbon is burned above the flame until it becomes ash.
• 😀 After the burning process, the remaining ash is placed on the same sheet of paper.
• 😀 The mass of the ash is measured and recorded, with a result of 0.50 grams.
• 😀 The mass of the magnesium ribbon is calculated to be 0.10 grams, based on the difference between initial and final weights.
• 😀 The mass of the magnesium ash is calculated as 0.04 grams.
• 😀 According to Antoine Lavoisier's law of conservation of mass, mass before and after the reaction remains constant, even though some energy or substances are not observable during the process.

Q & A

What equipment is required for this experiment?

The equipment required includes a digital balance, magnesium ribbon, paper, a spirit burner, tweezers, and a match.

What is the first step in the experiment?

The first step is to turn on the digital balance and weigh the empty piece of paper, which should show a mass of zero.

What happens after weighing the empty paper?

The next step is to weigh the paper with the magnesium ribbon, which shows a mass of 0.56 grams.

How should the magnesium ribbon be burned?

The magnesium ribbon should be burned over a spirit flame, and it's important to wear safety goggles to protect from the bright light emitted during the burning.

What happens to the magnesium during the burning process?

The magnesium ribbon burns completely and turns into ash.

What should be done with the magnesium ash after the burning process?

The magnesium ash should be placed on the same piece of paper and then weighed, which should give a mass of 0.50 grams.

What is the mass of the magnesium ribbon used in the experiment?

The mass of the magnesium ribbon is calculated as the difference between the mass of the paper with the magnesium ribbon (0.56 grams) and the mass of the empty paper (0.46 grams), resulting in 0.10 grams.

What is the mass of the magnesium ash produced?

The mass of the magnesium ash is calculated as the difference between the mass of the paper with the ash (0.50 grams) and the mass of the empty paper (0.46 grams), resulting in 0.04 grams.

Why is there a decrease in mass after burning the magnesium ribbon?

The decrease in mass occurs due to the fact that burning magnesium in an open environment leads to the loss of some substances or energy, which are not directly measured. This phenomenon aligns with Lavoisier's Law of Conservation of Mass.

What is the significance of Lavoisier's Law in this experiment?

Lavoisier's Law, also known as the Law of Conservation of Mass, states that mass before and after a chemical reaction remains constant. In this experiment, the observed mass change is due to unmeasured factors in the environment, not a violation of the law.