Which of the following statements about dynamic equilibrium is true?
The reaction has finished
The forwards and reverse reactions occur at the same rate
The concentration of reactants is the same as the concentration of products
When the pressure is increased and a gaseous reaction is at dynamic equilibrium, which direction does the position of equilibrium move?
The position of equilibrium is not affected by pressure
In the direction which forms the most gas molecules
In the direction which forms the fewest moles of gas
How would increasing gas pressure effect the equilibrium position in the reversible reaction described below?
C2H4(g) + H2(g) ⇌ C2H5OH(g)
The equilibrium position moves to the right
The equilibrium position moves to the left
The equilibrium position does not change
When a reaction has attained dynamic equilibrium, what happens to the position of equilibrium if the temperature is decreased?
The equilibrium position will not change
The equilibrium position moves in the endothermic direction
The equilibrium position moves in the exothermic direction
What is the effect of adding a catalyst to a reversible reaction?
It increases the yield
It decreases the time taken to reach equilibrium
It increases the energy of the particles
In the Haber process, increasing the pressure increases the yield of the reaction. Why is a very high pressure not used?
The rate would be too slow
The cost of achieving a very high pressure is too expensive
There would be unwanted side reactions and by-products would be made
In the Haber process, decreasing the temperature increases the yield of the reaction. Why is a very low temperature not used?
It would be too expensive
The gases would condense to form liquids and no longer react
Which of the following is a method used to produce ethanol from sugars?
Fermentation
Oxidation
Hydration
Why is producing ethanol from ethene not sustainable?
Ethene is a greenhouse gas
Ethene causes ozone depletion
Ethene comes from crude oil
Which of these factors does not affect the choice of reaction pathway in an industrial chemical manufacturing process?
The yield of product formed
The relative formula mass of the products
The uses for any by-products formed