Law of Conservation of Mass Lab

The video tutorial guides students through a lab experiment to observe the law of conservation of mass. Students compare mass changes before and after a chemical reaction using an effervescent tablet in both open and closed systems. The experiment demonstrates that mass is conserved in a closed system, confirming the law of conservation of mass. The tutorial emphasizes the importance of a closed system to prevent mass loss due to escaping gases.

What is the main objective of the lab experiment involving an effervescent tablet and water?

• To observe color changes in the solution

• To measure temperature changes during the reaction

• To determine the pH level of the solution

• To investigate mass changes before and after a chemical reaction

Which previous lab experiment is mentioned as a comparison for the current experiment?

• Lab 10: Burning a Candle

• Lab 12: Mixing Oil and Water

• Lab 8: Melting Ice Cubes

• Lab 5: Dissolving Salt in Water

According to the Law of Conservation of Mass, what happens to mass during a chemical reaction?

• Mass is created

• Mass is destroyed

• Mass remains constant

• Mass is doubled

In the open beaker experiment, what is the first step after filling the beaker with water?

• Measure the mass of the tablet

• Heat the water

• Stir the water

• Add the effervescent tablet

What should be done immediately after placing the tablet in the plastic bottle in the closed system experiment?

• Screw on the cap

• Shake the bottle

• Add more water

• Measure the temperature

Why is there a significant difference in mass change between the open and closed systems?

• The tablet dissolves faster in the closed system

• The scale is more accurate in the closed system

• Gas escapes in the open system

• The water evaporates in the closed system

What sound is heard when the cap is unscrewed from the plastic bottle?

• A fizzing noise

• No sound at all

• A hissing sound

• A popping sound

What conclusion can be drawn about the mass in a closed system after a chemical reaction?

• The mass increases

• The mass fluctuates

• The mass remains unchanged

• The mass decreases

What is the role of the closed system in the experiment?

• To allow gas to escape

• To prevent any change in mass

• To increase the reaction rate

• To decrease the reaction rate

What is the key factor that ensures the Law of Conservation of Mass holds true in the experiment?

• Using a larger beaker

• Conducting the experiment at a higher temperature

• Performing the experiment in a closed system

• Using a different type of tablet