Quiz Chemical equlibrium

​Chemical equilibrium

By Dinara Aubakirova

Multiple Choice

Chemical equilibrium is best described as:

• A reaction that stops completely
  
  
  

• A state where forward and reverse reaction rates are equal

• A state where reactants and products are present in equal amount

• A reaction that only goes forward

Multiple Choice

Increasing the concentration of reactants in a system at equilibrium will:

• Shift equilibrium to the right

• Shift equilibrium to the left

• Have no effect

• Change the equilibrium constant

Multiple Choice

Le Châtelier’s principle predicts that increasing temperature in an exothermic reaction will:

• Shift equilibrium to the right

• Shift equilibrium to the left

• Not affect equilibrium

• Stop the reaction

Multiple Choice

For the reaction:

N2(g)+3H2(g)⇌2NH3(g)
Increasing pressure will:

• Shift equilibrium to the left

• Shift equilibrium to the right

• No change

• Increase the equilibrium constant

Multiple Choice

Reaction:
2SO₂ + O₂ ⇌ 2SO₃ + Q

To shift the equilibrium to the left, it is necessary to…

• increase the concentration of sulfur dioxide

• decrease temperature

• increase temperature

• increase presure

Multiple Choice

Reaction:
2SO₂ + O₂ ⇌ 2SO₃ + Q

To shift the equilibrium to the right, it is necessary to…

• decrease presure

• increase temperature

• decrease the concentration of oxygen

• decrease temperature

Multiple Choice

To increase the yield of ammonia according to the reaction
N₂ + 3H₂ ⇌ 2NH₃ – Q, it is necessary to…

• decrease temperature

• decrease concentration of nitrogen

• increase concentration of hydrogen

• decrease presure

Multiple Select

Choose correct statements for the reaction
4NH₃ + 5O₂ → 4NO + 6H₂O + 904.8 kJ

• endothermic reaction

• exothermic reaction

• ∆H = +904,8 кДж

• ∆H = -904,8 кДж

Multiple Select

Choose correct statements for the reaction
4NH₃ (g)+ 5O₂ (g) → 4NO(g) + 6H₂O(g) + 904.8 kJ

• homogeneous reaction

• heterogeneous reaction

• combustion reaction

• double displacement reaction

Multiple Choice

Calculating Kc

For the reaction: A(g)⇌B(g)

At equilibrium: [A]=0.20 mol/L

[B]=0.80 mol/L

• 0.25

• 0.40

• 0.16

• 0.1