Law of Conservation of Mass Concepts

The video explains the law of conservation of mass using a campfire analogy. It describes how Antoine Lavoisier discovered this law, showing that mass remains constant during chemical reactions. The video also illustrates mass conservation in physical changes, like melting ice. It concludes with a call to action for further learning.

What happens to the wood as it burns in a campfire?

• It disappears completely.

• It rearranges into different molecules.

• It becomes heavier.

• It turns into water.

Who discovered the Law of Conservation of Mass?

• Marie Curie

• Antoine Lavoisier

• Albert Einstein

• Isaac Newton

What are the reactants in the burning of wood?

• Smoke and ash

• Wood and oxygen

• Hydrogen and nitrogen

• Water vapor and carbon dioxide

What are the products formed when wood burns?

• Hydrogen and nitrogen

• Wood and oxygen

• Smoke, ash, water vapor, and carbon dioxide

• Only carbon dioxide

According to the Law of Conservation of Mass, what happens to the mass of reactants and products?

• The mass of reactants is always greater.

• The mass of products is always greater.

• The mass is lost during the reaction.

• The mass remains the same.

If the mass of firewood and oxygen is 5 kg before burning, what will be the mass of the products after burning?

• 5 kg

• 0 kg

• 6 kg

• 4 kg

What happens to the mass of an ice cube as it melts and evaporates?

• It becomes zero.

• It remains the same.

• It increases.

• It decreases.

What is the mass of water vapor formed from a 100 g ice cube?

• 0 g

• 50 g

• 100 g

• 150 g

Which of the following is an example of a physical change?

• Cooking an egg

• Rusting iron

• Melting ice

• Burning wood

What does the Law of Conservation of Mass state about matter during changes?

• Matter remains constant.

• Matter is destroyed.

• Matter is created.

• Matter becomes energy.