How To Measure Loss Of Mass In A Reaction

The video tutorial explains the concept of mass conservation in chemical reactions, emphasizing that the total mass of reactants equals the mass of products. It discusses how mass can be lost when products escape as gas, using the example of Alka-Seltzer in water. The tutorial details how to measure this mass loss using electronic scales and how to calculate it using moles and molar mass. It stresses the importance of pre-experiment calculations to ensure accuracy and identify potential issues with reactants or equipment.

What happens to the total mass of reactants and products in a chemical reaction?

• The total mass increases.

• The total mass fluctuates randomly.

• The total mass decreases.

• The total mass remains the same.

Why might some products not remain in the reaction vessel during a chemical reaction?

• They dissolve in the liquid.

• They react with the vessel material.

• They escape as a gas.

• They turn into solid precipitates.

How can the loss of mass in a reaction be measured?

• By using a pH meter.

• By using electronic scales.

• By using a colorimeter.

• By using a thermometer.

What is the molar mass of carbon dioxide used in the calculation example?

• 40 grams per mole

• 28 grams per mole

• 44 grams per mole

• 32 grams per mole

Why is it important to perform calculations before conducting an experiment?

• To ensure the experiment is completed quickly.

• To predict the outcome and identify potential issues.

• To avoid using too many reactants.

• To make the experiment more interesting.