Chemical Equilibrium in Straw Experiments

The video tutorial demonstrates an equilibrium straw lab, where two graduated cylinders represent reactants and products. The instructor explains the setup and conducts two experiments, transferring water between cylinders using straws of different diameters. The first experiment starts with reactants, and the second with products. Observations show that equilibrium is reached when the water levels stabilize at four and six milliliters, respectively. The video concludes with a discussion on why equilibrium does not occur at equal levels.

What is the initial volume of reactants in the first experiment?

• 15 milliliters

• 10 milliliters

• 5 milliliters

• 0 milliliters

Which straw is placed in the reactant cylinder during the first experiment?

• No straw

• Fatter straw

• Thinner straw

• Both straws

What is the purpose of using straws with different diameters?

• To change the color of the water

• To increase water volume

• To simulate different reaction rates

• To measure temperature

What happens to the water levels after the first transfer?

• Reactants increase, products decrease

• Reactants decrease, products increase

• Both remain the same

• Both increase

What is the observed water level in the reactant cylinder at equilibrium?

• 6 milliliters

• 5 milliliters

• 4 milliliters

• 3 milliliters

What is the observed water level in the product cylinder at equilibrium?

• 3 milliliters

• 4 milliliters

• 6 milliliters

• 5 milliliters

In experiment two, where is the initial volume of 10 milliliters placed?

• Reactant cylinder

• Product cylinder

• Both cylinders

• Neither cylinder

What remains constant in both experiments at equilibrium?

• 5 and 5

• 2 and 8

• 4 and 6

• 3 and 7

Why does the water level not become constant at 5 and 5?

• Because equilibrium is reached at 4 and 6

• Because of straw placement

• Due to measurement error

• Due to evaporation

What is the main concept demonstrated by the straw lab experiment?

• Chemical equilibrium

• Color change

• Volume increase

• Temperature change