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WorksheetsHigher Chemistry - Equilibrium & Chemical Analysis Test Revision
Total questions: 20
Worksheet time: 15mins
Which of the following statements regarding a chemical reaction at equilibrium is always correct?
The rates of the forward and reverse reactions are equal.
The concentration of reactants and products are equal.
The forward and reverse reactions have stopped
The addition of a catalyst changes the position of the equilibrium.
Which line in the table best describes the effect of adding a catalyst to the following reaction?
4NH3(g) + 5O2(g) ⇌ 4NO(g) + 6H2O(g) ΔH = −ve
A
B
C
D
Consider the following reaction:
4NH3(g) + 5O2(g) ⇌ 4NO(g) + 6H2O(g) ΔH = −ve
What would happen to the position of equilibrium if the temperature was increased?
moves to left
moves to right
is unchanged
moves to right and then left
Cl2(g) + H2O(ℓ) ⇌ Cl− (aq) + ClO− (aq) + 2H+ (aq )
The addition of which of the following substances would move the above equilibrium to the right?
Hydrogen
Hydrogen chloride
Sodium chloride
Sodium hydroxide
ICl(ℓ) + Cl2(g) ⇌ ICl3(s) ΔH = −106 kJ mol−1
Which line in the table identifies correctly the changes that will cause the greatest increase in the proportion of solid in the above equilibrium mixture?
A
B
C
D
In which of the reactions shown would the yield of product be increased by lowering the pressure?
A
B
C
D
In a reversible reaction, equilibrium is reached when
molecules of reactants cease to change into molecules of products
the concentrations of reactants and products are equal
the concentrations of reactants and products are constant
the activation energy of the forward reaction is equal to that of the reverse reaction.
A student was carrying out a titration to establish the concentration of vitamin C using iodine solution. Which of the following would help the student achieve a precise end-point?
Placing a white tile underneath the conical flask
Using the bottom of the meniscus when reading the burette
Repeating titrations
Carrying out a rough titration first
The vitamin C content of a carton of orange juice was determined by four students. Each student carried out the experiment three times.
The most reproducible results were obtained by
Student A
Student B
Student C
Student D
Aluminium carbonate can be produced by the following reaction.
2AlCl3 (aq) + 3K2CO3 (aq) → Al2(CO3)3 (s) + 6KCl (aq)
The most suitable method of obtaining a sample of the aluminium carbonate is
collection over water
distillation
filtration
evaporation
Four amino acids, P, Q, R and S were analysed by chromatography. Larger molecules travel a shorter distance from the base line. Less polar molecules travel a greater distance from the base line.
Which of the following statements is correct?
P is less polar than S
Q is a larger molecule than P
R is more polar than P
S is a smaller molecule than Q
2KOH(aq) + H2SO4(aq) → K2SO4(aq) + 2H2O(ℓ)
How many moles of potassium hydroxide, KOH, neutralise 50 cm3 of 0·2 mol l−1 sulfuric acid, H2SO4?
0.01
0.02
0.1
0.4
A student produced the results shown in the table for a redox titration. What is the average titre?
20·35
20.50
20·55
20.60
An equilibrium mixture of NO2 and N2O4 in a sealed gas syringe has a pale brown colour.
2NO2(g) ⇌ N2O4(g)
Increasing the pressure causes the mixture to become paler. Increasing the temperature causes the mixture to become darker. Which line in the table correctly identifies the colour of NO2 and the enthalpy change for the forward reaction?
A
B
C
D
In a titration, why does potassium permanganate need to be acidified before it can be used as an indicator?
acid will provide H+ Ions
to neutralise it
acid will remove H+ ions
it doesn't need to be acidified because it is self indicating
In a titration which of these is something that is NOT done as good practice?
use a white tile underneath conical flask
use a measuring cylinder to measure volumes
use a burette/pipette throughout
repeat experiments until concordant results
Which of these is NOT a step in making a standard solution?
Use wash bottle to rinse beaker and add washing to volumetric flask
Measure accurately the mass of solid in a beaker
Swirl the flask and add dropwise until you see a colour change
Make volumetric flask up to the mark with deionised water and invert
What type of glassware is used to make a standard solution up in?
volumetric flask
conical flask
measuring cylinder
filter funnel
Chromatography separates mixtures out according to polarity and what other property?
molecular mass
viscosity
boiling point
density
What mass of sodium carbonate (gfm = 106) is required to make a standard solution in a 100 ml flask with concentration 0.2 mol l-1?
2.12 g
5300 g
5.3 g
212 g
