Chemical Equilibrium

Which of the following best describes a reversible chemical reaction?

• A reaction that proceeds in only one direction

• A reaction where the concentrations of reactants and products remain constant

• A reaction that involves different substances as reactants and products

• A reaction that occurs at a constant temperature

At the start of a reversible process, the reaction proceeds towards the formation of:

• Reactants

• Products

• Equilibrium

• Catalysts

What is the condition required for chemical equilibrium to be achieved?

• The concentrations of reactants and products must be equal

• The forward reaction rate must be faster than the reverse reaction rate

• The rates of the forward and reverse reactions must be equal

• The temperature must be constant throughout the reaction

Chemical equilibrium can be compared to the movement of skiers at a busy ski resort because:

• The number of skiers carried up the mountain is equal to the number coming down the slopes

• The number of people at the top and the number at the bottom of the slope do not change

• Skiers undergo physical processes similar to the changes in chemical equilibrium

• The concentration of skiers at the top and the bottom of the slope remains constant

What is physical equilibrium?

• Equilibrium between two phases of the same substance

• Equilibrium between different substances as reactants and products

• Equilibrium involving chemical reactions

• Equilibrium at a constant temperature

Which of the following is an example of physical equilibrium?

• The vaporization of water in an open container

• The reaction between nitrogen dioxide and dinitrogen tetroxide

• The combustion of methane gas

• The synthesis of ammonia from nitrogen and hydrogen

How can the progress of the reaction N2O4(g) ⇌ 2NO2(g) be monitored?

• By measuring the temperature change

• By observing the color change

• By measuring the pressure change

• By analyzing the pH of the solution

Which of the following statements is true about a chemical equilibrium state?

• The concentrations of both reactants and products remain constant

• The reaction stops completely

• The forward reaction rate is faster than the reverse reaction rate

• The temperature increases

Which of the following best describes the reaction N2O4 ⇌ 2NO2?

• Irreversible reaction

• Exothermic reaction

• Endothermic reaction

• Reversible reaction

What is the significance of the double arrow in the reaction equation N2O4 ⇌ 2NO2?

• It indicates an irreversible reaction

• It represents a catalyst in the reaction

• It shows the direction in which the reaction proceed

• It signifies that the reaction is reversible