PHYSICAL CHEM SEM 2

Matric No:

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Tutorial:

• S1K1T5
• S2K1T3
• S2K1T4

_____________ is the time required for concentration A to decrease to half of its initial concentration

• A. half time
• B. rate law
• C. half life
• D. rate constant

What makes an effective collision?

• A. When reactant molecules collide with proper orientation and high speed.
• B. When molecules collide with proper orientation and enough kinetic energy greater than activation energy.
• C. When molecules collide with proper orientation and enough kinetic energy equal to or greater than activation energy.
• D. When reactants energy enough to form activated complex.

What is activation energy?

• A. The energy needed for a reaction to occur
• B. The minimum amount of energy for a reaction to potentially occur.
• C. The energy added by the catalyst.
• D. The energy possessed by the products.

What is the energy of the activated complex?

• A. 75 kJ
• B. 300 kJ
• C. 225 kJ
• D. 150 kJ

The relationship between rate constant of a reaction and temperature is expressed by___________.

• A. rate law
• B. rate order
• C. Maxwell Boltzmann Curve
• D. Arrhenius equation

Which of the following equations represents the enthalpy change of combustion?

• A. 2C₄H₁₀(g) + 13O₂(g) ⟶ 8CO₂(g) + 10H₂O(g)
• B. C₄H₁₀(g) + 13/2O₂(g) ⟶ 4CO₂(g) + 5H₂O(g)
• C. C₄H₁₀(g) + 9/2O₂(g) ⟶ 4CO(g) + 5H₂O(g)
• D. C₄H₁₀(g) + 5/2O₂(g) ⟶ 4C(s) + 5H₂O(g)

In an exothermic reaction the products have

• A. More energy than the reactant
• B. Same energy as the reactant
• C. Lesser energy than the reactant
• D. No energy at all.