Several reactions of calcium carbonate with dilute hydrochloric acid are carried out at the same temperature.

CaCO₃ (s) + 2HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g)

Which reaction has the greatest rate?

Which change does not increase the rate of this reaction?

${\mathrm{CuCO}}_3 \left(\mathrm{s}\right)+{\mathrm{H}}_2{\mathrm{SO}}_4 \left(\mathrm{aq}\right)\to {\mathrm{CuSO}}_4 \left(\mathrm{aq}\right)+{\mathrm{H}}_2\mathrm{O} \left(\mathrm{l}\right)+{\mathrm{CO}}_2 \left(\mathrm{g}\right)$

A.  Increasing the particle size of the ${\mathrm{CuCO}}_3$

B.  Increasing the temperature

C.  Increasing the concentration of ${\mathrm{H}}_2{\mathrm{SO}}_4 \left(\mathrm{aq}\right)$

D.  Stirring the reaction mixture

Which explains increasing rate of reaction with increasing temperature?

Which statements are correct about the action of a catalyst in a chemical reaction?

I.   It increases the energy of each collision.
II.  It alters the mechanism of the reaction.
III. It remains unchanged at the end of the reaction.

A.  I and II only

B.  I and III only

C.  II and III only

D.  I, II and III

Which properties can be monitored to determine the rate of the reaction?

Fe (s) + CuSO₄ (aq) → Cu (s) + FeSO₄ (aq)

    I. change in volume
    II. change in temperature
    III. change in colour

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

Which conditions are required for the reaction between two molecules?

    I. a collision
    II. E ≥ E_a
    III. proper orientation

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

What is the activation energy of the reverse reaction?

The same amount of two gases, X and Y, are in two identical containers at the same temperature. What is the difference between the gases?

A. X has the higher molar mass.

B. Y has the higher molar mass.

C. X has the higher average kinetic energy.

D. Y has the higher average kinetic energy.

The dotted line represents the formation of oxygen, O₂ (g), from the uncatalysed complete decomposition of hydrogen peroxide, H₂O₂ (aq).

Which curve represents a catalysed reaction under the same conditions?