Chemical Reactions and Precipitate Formation

The video tutorial demonstrates the chemical reaction between hydros sunfu and sunfurơ. It begins with an introduction to the substances involved, followed by the setup of the experiment where hydros sunfu is added to a test tube. The reaction is observed as sunfur is added dropwise, resulting in a white precipitate that eventually turns pale yellow, indicating the formation of sulfur crystals. The video concludes with a summary of the observations and the chemical changes that occurred.

What are the two chemicals involved in the reaction discussed in the video?

• Hydrogen peroxide and sulfuric acid

• Hydrogen sulfide and sulfur dioxide

• Hydrogen peroxide and sulfur dioxide

• Hydrogen sulfide and sulfuric acid

How much hydrogen sulfide solution is added to the test tube?

• 1 to 2 ml

• 2 to 3 ml

• 3 to 4 ml

• 4 to 5 ml

What is the next step after adding hydrogen sulfide solution to the test tube?

• Shake the test tube vigorously

• Add water to the test tube

• Heat the test tube

• Add sulfur dioxide solution drop by drop

What is the initial color of the precipitate formed in the reaction?

• White

• Yellow

• Red

• Blue

What color does the precipitate turn into after some time?

• Dark yellow

• Pale yellow

• Brown

• Green