Understanding the Law of Conservation of Mass

The video from EscolAnimada introduces the concept of the Law of Conservation of Mass, attributed to Lavoisier, who demonstrated that mass remains constant in a closed system during chemical reactions. The video explains different types of systems: open, closed, and isolated, and uses the electrolysis of water as an example to illustrate the law. It concludes with a call to action for viewers to subscribe for more educational content.

What is the famous expression mentioned at the beginning of the video?

• In nature, everything is created and destroyed.

• In nature, nothing is created, nothing is lost, everything is transformed.

• In nature, everything is created and nothing is lost.

• In nature, nothing is created and everything is lost.

Who is the 'celebrity of the day' mentioned in the video?

• Albert Einstein

• Marie Curie

• Isaac Newton

• Antoine Lavoisier

What does the Law of Conservation of Mass state?

• The mass of the products is always equal to the mass of the reactants.

• The mass of the products is always less than the mass of the reactants.

• The mass of the products is always different from the mass of the reactants.

• The mass of the products is always greater than the mass of the reactants.

What is a system in the context of the video?

• A portion of the universe considered for study or analysis.

• A machine used in chemical experiments.

• A type of chemical reaction.

• A method of measuring mass.

Which type of system allows the exchange of both energy and matter with its surroundings?

• Open system

• None of the above

• Isolated system

• Closed system

In a closed system, what is exchanged with the surroundings?

• Neither energy nor matter

• Only matter

• Only energy

• Both energy and matter

What is an example of a closed system mentioned in the video?

• A thermos with hot coffee

• A distillation process of water and salt

• A boiling pot of water

• A forest ecosystem

During the electrolysis of water, what are the products formed?

• Hydrogen and carbon dioxide

• Hydrogen and oxygen

• Water and salt

• Oxygen and carbon dioxide

What is the mass of hydrogen produced from 9 grams of water in the electrolysis example?

• 1 gram

• 10 grams

• 8 grams

• 9 grams

Why is it important to use a closed system in Lavoisier's experiments?

• To prevent the loss of mass

• To allow gases to escape

• To increase the reaction rate

• To change the mass of the reactants