Reaction Rates and Surface Area

Ed Escodaro introduces an experiment for National Chemistry Week, focusing on how surface area affects reaction rates. Using Alka-Seltzer tablets in different forms—whole, broken, and powdered—the experiment demonstrates that increased surface area leads to faster reactions. The setup involves hydrochloric acid to simulate stomach conditions, and the reaction is observed until bubbling ceases. The powdered form reacts the quickest, illustrating the importance of surface area in chemical reactions.

What is the main focus of the experiment introduced in the video?

• The effect of temperature on reaction rate

• The effect of surface area on reaction rate

• The effect of pressure on reaction rate

• The effect of concentration on reaction rate

Which material is used to simulate the reaction in the stomach?

• Sulfuric acid

• Hydrochloric acid

• Vinegar

• Sodium bicarbonate

How many pieces is the Alka-Seltzer tablet broken into for the second test?

• Eight pieces

• Six pieces

• Four pieces

• Two pieces

What indicates the end of the reaction during the experiment?

• The disappearance of the tablet

• The cessation of bubbling

• The color change of the solution

• The increase in temperature

Which form of Alka-Seltzer tablet reacted the fastest?

• Whole tablet

• Tablet dissolved in water

• Tablet broken into pieces

• Powdered tablet

What is the main observation about the reaction rate with different surface areas?

• Surface area has no effect on the reaction

• Larger surface area speeds up the reaction

• Smaller surface area speeds up the reaction

• Larger surface area slows down the reaction

What happens to the Alka-Seltzer tablet in the original test?

• It changes color

• It dissolves completely

• It remains unchanged

• It reduces to half its size

Why does the powdered form of the tablet react more quickly?

• It is less dense

• It is more concentrated

• It has a larger surface area

• It has a higher temperature

What is the role of hydrochloric acid in the experiment?

• To change the color of the solution

• To act as a catalyst

• To simulate stomach acid

• To increase the temperature

What conclusion can be drawn about the relationship between surface area and reaction rate?

• Smaller surface area increases reaction rate

• Surface area does not affect reaction rate

• Larger surface area increases reaction rate

• Larger surface area decreases reaction rate