Chemical Reactions and Mass Conservation

The video tutorial demonstrates the law of conservation of mass through a lab experiment. The instructor introduces the materials needed, including balloons, a test tube holder, baking soda, and vinegar. The materials are weighed before and after the reaction between sodium bicarbonate and acetic acid. The reaction produces carbon dioxide, water, and sodium acetate, with the loss of mass attributed to the escape of gas. The tutorial concludes with an explanation of the chemical reaction and its applications.

What is the main purpose of the lab demonstration?

• To show how to inflate a balloon

• To demonstrate the law of conservation of mass

• To create a chemical explosion

• To measure the acidity of vinegar

Which of the following is NOT a material used in the experiment?

• Test tube holder

• Sodium chloride

• Balloons

• Vinegar

What is the mass of the balloon before adding sodium bicarbonate?

• 0.210 grams

• 4.200 grams

• 11.270 grams

• 15.355 grams

How is the mass of sodium bicarbonate in the balloon determined?

• By adding the mass of the balloon and funnel

• By subtracting the mass of the empty balloon from the balloon with sodium bicarbonate

• By measuring the volume of the balloon

• By using a chemical formula

What is the chemical formula for acetic acid used in the experiment?

• CH3COOH

• H2O

• NaHCO3

• CO2

What gas is produced during the reaction between sodium bicarbonate and acetic acid?

• Oxygen

• Hydrogen

• Carbon dioxide

• Nitrogen

Why does the mass of the products appear less than the reactants?

• Gas escaped from the balloon

• Some of the reactants were not used

• The products were heavier

• The scale was faulty

What is the final mass of the products and equipment after the reaction?

• 8.075 grams

• 7.925 grams

• 11.480 grams

• 19.405 grams

What is the role of sodium acetate in the reaction?

• It is a catalyst

• It is a byproduct

• It is a reactant

• It is an inhibitor

What happens to the carbon dioxide produced in the reaction?

• It dissolves in the solution

• It escapes as a gas

• It reacts with water

• It forms a solid