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WorksheetsKinetics Practice 1
Total questions: 10
Worksheet time: 20mins
Which change increases the rate of formation of hydrogen when zinc reacts with excess hydrochloric acid, assuming all other conditions remain the same?
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
Adding water to the hydrochloric acid
Decreasing the temperature
Increasing the volume of hydrochloric acid
Decreasing the size of the zinc particles while keeping the total mass of zinc the same
Which statements (I through III, shown) are correct?
I and II only
I and III only
II and III only
I, II and III
The potential energy profile for the reversible reaction,
X + Y ⇄ Z is shown.
Which arrow represents the activation energy for the reverse reaction, Z → X + Y, with a catalyst?
A
B
C
D
Which factors can affect the rate of reaction?
I and II only
II and III only
II and III only
1, II and III
Excess magnesium powder was added to a beaker containing hydrochloric acid, HCl (aq). The mass of the beaker and its contents was recorded and plotted against time (line I).
Which change could give line II?
Doubling the mass of powdered Mg
Using the same mass of Mg ribbon
Increasing the temperature
Using the same volume of more concentrated HCl
Copper catalyses the reaction between zinc and dilute sulfuric acid.
Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)
Why does copper affect the reaction?
Decreases the activation energy
Increases the activation energy
Increases the enthalpy change
Decreases the enthalpy change
100 mL (100 cm3) of 10% hydrogen peroxide solution decomposes at 298 K to form water and oxygen.
H2O2(aq) → H2O(l) + O2(g)
The dotted line graph represents the volume of oxygen produced. Which graph represents the decomposition of an equal volume of a 20% solution under the same conditions?
A
B
C
D
CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)
Which change does not increase the initial rate of reaction when CaCO3(s) is added to excess HCl(aq)?
Decrease in the size of the CaCO3(s) particles
Increase in the temperature of the reaction mixture
Increase in the concentration of HCl(aq), keeping the same volume
Increase in the volume of HCl(aq), keeping the same concentration
Which conditions must be met for a reaction to take place?
I and II only
II and III only
II and III only
1, II and III
Graph 1 shows a plot of volume of CO2(g) against time for the reaction of CaCO3(s) with 1.00 mol/L HCl (aq). The acid is the limiting reagent and entirely covers the lumps of CaCO3(s).
Which set of conditions is most likely to give the data plotted in graph 2 when the same mass of CaCO3(s) is reacted with the same volume of HCl(aq) at the same temperature?
Larger lumps CaCO3(s) and [HCl] = 1.00 mol/L
Smaller lumps CaCO3(s) and [HCl] = 0.05 mol/L
Smaller lumps CaCO3(s) and [HCl] = 1.00 mol/L
Larger lumps CaCO3(s) and [HCl] = 0.05 mol/L
