Consider the hypothetical reaction: X + Y → Z. The formation of Z as the reaction progresses was recorded. The following graph shows the formation of Z over time. 

At what time does the reaction reach completion? 

The speed of a chemical reaction

Label the energy diagram shown below:

Consider the energy diagram below. Calculate the enthalpy change and activation energy for the reaction.

Which of the following shows the reaction coordinate for an uncatalyzed and catalyzed endothermic reaction?

Which of the following does not apply to heterogeneous catalysts?

 Which statements apply to the function/s of a catalyst in a reaction?

A. The catalyst increases the activation energy of a reaction.

B. The catalyst decreases the activation energy of a reaction.

C. The catalyst has no effect on the activation energy.

D. The catalyst increases the rate constant.

E. The catalysts decreases the rate constant.

F. The catalysts has no effect on the rate constant.

TRUE or FALSE. The overall enthalpy change (going from reactants to products) is a factor that affects reaction rates, and endothermic reactions are always slower than exothermic reactions.

What effects do temperature, concentration, and surface area have on the rate of a chemical reaction?

Refer to the following reaction:

4 NH₃(g) + 5 O₂(g) → 4 NO(g) + 6 H₂O(g)

Provide the missing information below.

Δ[NH₃]/Δt = –0.048 M/s

Δ[O₂]/Δt = __________

Δ[NO]/Δt = __________

Δ[H₂O]/Δt = __________

Rate = __________

Give the relationship between the rate of disappearance of the reactants and the rate of appearance of the products in the gas-phase reaction below: 

4 NO₂ (g) + O₂ (g) → 2 N₂O₅ (g)

Given a hypothetical aqueous reaction

C → D

A solution of 0.078 mol C in a total volume of 200 mL was made in a flask. The moles of C for every 10 seconds was recorded.

What is the amount in moles of D in the solution for each time recorded in the following data with the assumption that there is only C initially and no molecule of D and that the reaction does not have an intermediate?