Understanding the Law of Conservation of Matter

The video explains the law of conservation of matter, stating that matter is neither created nor destroyed during a chemical reaction. It uses examples like dissolving sugar in tea and burning wood in a bonfire to illustrate the concept. The historical development of the law is discussed, highlighting contributions from the ancient Greeks and Antoine Lavoisier. The video concludes with review questions to reinforce learning.

What does the law of conservation of matter state about the mass of reactants and products in a chemical reaction?

• The mass of reactants and products are unrelated.

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

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

• The mass of reactants equals the mass of products.

In the context of a bonfire, what happens to the matter when wood burns?

• It is completely destroyed.

• It transforms into ashes, carbon dioxide, and water vapor.

• It remains unchanged.

• It turns into only carbon dioxide.

Who was the first to propose the idea that the total amount of matter in the universe is constant?

• Ancient Greeks

• Ancient Romans

• Antoine Lavoisier

• Ancient Egyptians

In what year did Antoine Lavoisier describe the law of conservation of matter?

• 1995

• 1885

• 1789

• 1902

Which of the following is a chemical reaction you might observe in daily life?

• Breaking a glass

• Rusting of iron

• Boiling water

• Melting ice