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The chemical equation and concentration-time graph for the reaction are shown below.

Image failed to load: Concentration-time graph for Cl2(g)+CO(g)->COCl2(g) deltaH=+108kJ, at t=4 min conc. of Cl2 and CO increase, COCl2 decreases.

According to the concentration-time graph above, which change may have occurred at ?

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Consider the equilibrium reaction:

Which statement is true regarding the concentrations of the species at equilibrium?

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The oxidation of nitrogen monoxide, , to nitrogen dioxide, , can be represented by the following equation:

of and of were added to a reaction vessel kept at . The amount of present at equilibrium is .

What is the equilibrium constant at ?

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The energy profile diagram below illustrates the energy changes for an uncatalysed reaction, while the dotted line depicts the energy changes for the catalysed reaction.

Image failed to load: Energy profile: curve starts at 100, rises to 190 kJ/mol, then descends to 50 kJ/mol. A second dashed curve rises to 40kJ/mol

Which of the following best matches the energy profile diagram?
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The equation for a reaction is

The expression for the equilibrium constant for the reaction is

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Which of the following best describes an irreversible reaction?
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The rate of a reaction between sulfuric acid and powdered magnesium carbonate could be increased by
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Which of the following statements about gas pressure in a reaction involving gaseous reactants is true?
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Which of the following statements best describes the impact of a catalyst on the enthalpy change of a chemical reaction?

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What effect does increasing the temperature have on the rate of reaction?

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