Measuring For The Loss Of Mass In A Reaction

The video explains the concept of mass conservation in chemical reactions, highlighting 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 an Alka-Seltzer tablet in water. The video details methods to measure mass loss, such as using electronic scales, and explains how to calculate mass loss using moles and molar mass. It emphasizes the importance of these calculations in ensuring experiment accuracy and identifying potential errors.

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

• The total mass remains the same.

• The total mass decreases.

• The total mass increases.

• The total mass fluctuates.

Why is it important to measure the loss of mass during a chemical reaction?

• To determine the color change of the reactants.

• To calculate the rate of the reaction.

• To measure the temperature change.

• To identify the type of reaction.

In the reaction between calcium carbonate and hydrochloric acid, what is one of the products that escapes as a gas?

• Hydrochloric acid

• Calcium chloride

• Carbon dioxide

• Water

How can you measure the mass loss in a reaction involving marble chips and hydrochloric acid?

• By using a thermometer.

• By using a pH meter.

• By using electronic scales.

• By using a colorimeter.

If 0.25 moles of calcium carbonate are used, how much mass is lost as carbon dioxide?

• 5 grams

• 11 grams

• 22 grams

• 44 grams