Exploring Conservation of Mass in Closed Systems

The video tutorial explains the law of conservation of mass in closed systems, demonstrating it through an experiment involving a sealed bottle with soil, water, and a seed. It further illustrates the concept with a chemical reaction between vinegar and baking soda, showing that the mass remains constant when the system is closed. The experiment concludes by allowing gas to escape, proving that mass changes only when the system is open.

What does the law of conservation of mass state?

• Mass can be created or destroyed in a closed system.

• Mass remains constant over time in a closed system.

• Mass increases over time in a closed system.

• Mass decreases over time in a closed system.

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In the example with the sealed bottle, what is expected to happen to the mass over time?

• The mass will fluctuate.

• The mass will increase.

• The mass will decrease.

• The mass will remain the same.

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NGSS.MS-PS1-5

Why does the mass of the sealed bottle remain constant?

• Because the bottle is shaken.

• Because the bottle is heated.

• Because the bottle is open.

• Because no matter can enter or leave the system.

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What are the components used in the laboratory experiment to test the conservation of mass?

• Vinegar and salt

• Vinegar and baking soda

• Water and baking soda

• Water and salt

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What is the initial mass of all components in the experiment?

• 181 grams

• 178 grams

• 180 grams

• 179 grams

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What happens inside the bottle when vinegar is added to baking soda?

• A violent reaction producing carbon dioxide occurs.

• Nothing happens.

• The baking soda dissolves.

• The vinegar evaporates.

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After the reaction, what is the mass of the sealed bottle?

• 181 grams

• 179 grams

• 180 grams

• 178 grams

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NGSS.MS-PS1-5

What gas is produced during the reaction between vinegar and baking soda?

• Carbon dioxide

• Nitrogen

• Hydrogen

• Oxygen

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What happens to the mass when the carbon dioxide gas is allowed to escape?

• The mass increases.

• The mass decreases.

• The mass fluctuates.

• The mass remains the same.

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NGSS.MS-PS1-5

What does the experiment demonstrate about mass in a closed system?

• Mass is not conserved.

• Mass is created.

• Mass is conserved.

• Mass is destroyed.

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