Exploring the Law of Conservation of Mass

The video tutorial explains the conservation of mass in physical changes, state changes, and chemical reactions. It emphasizes the importance of closed systems in experiments and demonstrates these concepts through various examples, including clay manipulation, water state changes, and chemical reactions with antacid tablets. The video also introduces the Law of Conservation of Mass and its application in real-world scenarios like fireworks and gold casting.

What should children do before conducting experiments?

• Watch a movie

• Do it alone

• Ask their friends for help

• Get permission and supervision from an adult

What happens to the mass of clay when it is physically changed?

• It increases

• It disappears

• It decreases

• It stays the same

Tags

NGSS.MS-PS1-2

In a closed system, what happens to the mass of water when it changes from liquid to solid?

• It decreases

• It stays the same

• It evaporates

• It increases

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NGSS.MS-PS1-2

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Why do gold miners melt gold nuggets into bars?

• To make them heavier

• To change their color

• To make them easier to store and sell

• To reduce their mass

What is the Law of Conservation of Mass?

• Mass can be created or destroyed

• Mass changes with temperature

• Mass remains the same in a closed system

• Mass is different in solid and liquid states

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is produced when wood burns in a chemical reaction?

• Ashes, carbon dioxide, and water vapor

• Only water vapor

• Only carbon dioxide

• Only ashes

What do the red balls in the molecular models represent?

• Carbon atoms

• Oxygen atoms

• Calcium atoms

• Hydrogen atoms

Tags

NGSS.MS-PS1-1

What is a molecule made of?

• A single atom

• Two or more atoms grouped together

• Only carbon atoms

• Only oxygen atoms

Tags

NGSS.MS-PS1-1

What happens to atoms during a chemical reaction?

• They regroup into different molecules

• They disappear

• They lose mass

• They change into different atoms

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NGSS.MS-PS1-2

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What is the second most famous molecule in K-12 science?

• Oxygen

• Carbon dioxide

• Water

• Calcium

Tags

NGSS.MS-ESS2-4