Exploring the Conservation of Matter in Chemical Reactions

The video tutorial explores the law of conservation of matter, demonstrating that during a chemical reaction, the total number of atoms and mass remain constant. An experiment using baking soda and vinegar is conducted to test this law. Initially, a mass drop is observed due to CO2 escaping. By trapping the CO2 with a balloon, the experiment confirms that the total mass remains unchanged, validating the conservation of matter.

What does the law of conservation of matter state?

• The total number of atoms and mass change during a chemical reaction.

• The total number of atoms and mass remain the same during a chemical reaction.

• The total number of atoms increases during a chemical reaction.

• The total mass decreases during a chemical reaction.

Tags

NGSS.MS-PS1-5

What materials were used in the initial reaction demonstration?

• Baking soda and water

• Sodium acetate and water

• Vinegar and water

• Baking soda and vinegar

What was observed when the reaction between baking soda and vinegar occurred?

• The mass remained the same

• The mass increased

• No change in mass

• The mass decreased

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which gas was produced during the reaction that caused bubbling?

• Carbon dioxide

• Oxygen

• Hydrogen

• Nitrogen

Tags

NGSS.MS-PS1-2

What were the products of the reaction between vinegar and baking soda?

• Sodium chloride, hydrogen, and oxygen

• Sodium acetate, hydrogen, and oxygen

• Sodium chloride, water, and carbon dioxide

• Sodium acetate, water, and carbon dioxide

Tags

NGSS.MS-PS1-2

Why did the mass appear to decrease during the initial reaction?

• Some of the CO2 escaped

• Some of the vinegar evaporated

• Some of the baking soda was not used

• The flask was not sealed properly

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How was the mass discrepancy resolved in the experiment?

• By using a different flask

• By trapping the CO2 in a balloon

• By using more vinegar

• By using more baking soda

Tags

NGSS.MS-PS1-5

What was the total mass before and after the reaction when CO2 was trapped?

• 150 grams

• 200 grams

• 250 grams

• 300 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What does the experiment confirm about the law of conservation of matter?

• The total mass decreases during a chemical reaction.

• The total number of atoms increases during a chemical reaction.

• The total number of atoms and mass remain the same during a chemical reaction.

• The total number of atoms and mass change during a chemical reaction.

Tags

NGSS.MS-PS1-5

What were the initial and final products of the reaction?

• Vinegar and water; sodium acetate, water, and carbon dioxide

• Baking soda and vinegar; sodium acetate, water, and carbon dioxide

• Baking soda and water; sodium acetate, water, and carbon dioxide

• Sodium acetate and water; baking soda and vinegar

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5