Chemical Reactions and Lime Water

The video tutorial demonstrates an experiment to show how respiration produces carbon dioxide. It involves preparing lime water by mixing chalk with water, setting up glasses with lime water and water, and blowing into them to observe the formation of calcium carbonate. The experiment illustrates the chemical reaction between Ca(OH)2 and CO2, resulting in a cloudy solution due to the formation of CaCO3.

What is the purpose of grinding the chalk and mixing it with water?

• To dissolve the chalk completely

• To create a solution that can absorb oxygen

• To make lime water for the experiment

• To produce a colored solution

How many glasses of lime water are prepared for the experiment?

• Four

• Three

• Two

• One

What is the purpose of blowing into one of the glasses of lime water?

• To change the color of the solution

• To mix the solution thoroughly

• To compare the effect of CO2 on lime water

• To add oxygen to the solution

What compound is formed when Ca(OH)2 reacts with CO2?

• Calcium chloride

• Calcium carbonate

• Calcium nitrate

• Calcium sulfate

Why does lime water turn cloudy when exposed to CO2?

• Because of the formation of calcium carbonate

• Due to the evaporation of water

• Because of the dissolution of chalk

• Due to the presence of oxygen

What is the chemical formula for lime water?

• H2O

• CO2

• Ca(OH)2

• CaCO3