The video tutorial introduces a chemistry experiment involving four solutions: sodium chloride, copper sulfate, aluminum sulfate, and iron(III) chloride. The teacher demonstrates adding excess NaOH to each solution and encourages students to observe the reactions and identify the contents of each test tube.

Which of the following chemicals is NOT mentioned in the introduction?

• Nhôm sunfat

• Natri clorua

• Đồng Sunfat

• Magnesium chloride

What is the purpose of adding NaOH to the solutions?

• To observe the reactions and identify the chemicals

• To dilute the solutions

• To neutralize the solutions

• To change the color of the solutions

What should students do after adding NaOH to the solutions?

• Heat the solutions

• Shake the solutions gently

• Leave the solutions undisturbed

• Add more chemicals

Which chemical is NOT part of the experiment?

• Calcium chloride

• Nhôm sunfat

• Natri clorua

• Đồng Sunfat

What is the final step in the experiment?

• Heating the solutions

• Filtering the solutions

• Observing the reactions

• Adding more NaOH