Milk Powder Combustion Demonstration

The video tutorial explains the effect of surface area on reaction rates using a demonstration with milk powder. It contrasts the slow reaction of a small pile of milk powder with the rapid reaction when the powder is dispersed as a fine cloud. The tutorial provides detailed instructions for setting up and conducting the experiment safely, emphasizing the importance of maintaining a safe distance and the impact of the height from which the powder is sprinkled on the size of the fireball produced.

What is a common method used by chemistry teachers to demonstrate the effect of surface area on reaction rate?

• Heating a metal rod

• Using a Bunsen burner

• Mixing salt and water

• Reacting marble chips with acid

What happens to the reaction rate when milk powder is arranged in a small pile?

• The reaction rate is very slow

• The reaction rate is moderate

• The reaction rate is very fast

• The reaction does not occur

How does the reaction rate change when milk powder is sprinkled as a fine cloud?

• The reaction stops

• The reaction rate decreases

• The reaction rate remains the same

• The reaction rate increases

What is the purpose of using a metre ruler and splints in the milk powder demonstration?

• To keep the flame burning horizontally

• To ensure the powder falls evenly

• To weigh the milk powder

• To measure the amount of milk powder

Why is it important to sprinkle the milk powder from a height?

• To avoid extinguishing the flame

• To create a larger fireball

• To prevent the powder from clumping

• To ensure the powder is evenly distributed

What should you do immediately after the bottom of the milk powder cloud ignites?

• Add more milk powder

• Increase the flame size

• Extinguish the flame

• Step back quickly