Exploring Conservation of Mass in Open Systems

What is the main topic of this lesson?

• Conservation of mass in open systems

• Conservation of energy

• Conservation of charge

• Conservation of momentum

Tags

NGSS.MS-PS1-5

According to the law of conservation of mass, what must a system be for mass to be conserved?

• Closed

• Open

• Isolated

• Dynamic

Tags

NGSS.MS-PS1-5

In the campfire example, what happens to the mass of the logs as they burn?

• It fluctuates

• It decreases

• It remains the same

• It increases

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Why does the mass of the campfire system decrease over time?

• New atoms and molecules are formed

• Atoms and molecules are destroyed

• Atoms and molecules escape

• Atoms and molecules are absorbed

Tags

NGSS.MS-PS1-5

What is the purpose of the laboratory experiment with vinegar and baking soda?

• To demonstrate the conservation of energy

• To show the conservation of mass in a closed system

• To investigate the conservation of mass in an open system

• To measure the temperature change during a reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is used in the laboratory experiment to react with baking soda?

• Sugar

• Salt

• Vinegar

• Water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is observed when vinegar is added to baking soda in the experiment?

• Vigorous bubbling

• A temperature drop

• A color change

• No reaction

Tags

NGSS.MS-PS1-2

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

• Carbon dioxide

• Oxygen

• Hydrogen

• Nitrogen

Tags

NGSS.MS-PS1-2

Why does the final mass of the system decrease after the reaction?

• The reaction absorbs mass

• The scale is faulty

• Carbon dioxide escapes

• Some mass is converted to energy

Tags

NGSS.MS-PS1-5

What does the experiment prove about mass in an open system?

• Mass increases

• Mass is not conserved

• Mass fluctuates randomly

• Mass is always conserved

Tags

NGSS.MS-PS1-5