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quiz Science & Engineering · 10 questions

Fundamental Concepts in Chemistry and Thermodynamics

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1

Why does the H₂O molecule have a bond angle smaller than the ideal tetrahedral angle?

2

According to molecular orbital theory, why is He₂ not a stable molecule under normal conditions?

3

For the reaction C(s) + O₂(g) → CO₂(g) with ΔH°₍₂₉₈₎ = –393.5 kJ, which statement is correct?

4

A reaction has ΔH > 0 and ΔS > 0. Under which condition will the reaction be spontaneous?

5

For the rate law v = k[A]²[B], what happens to the reaction rate if [A] is doubled while [B] remains constant?

6

In the equilibrium PCl₅ ⇌ PCl₃ + Cl₂ at 250 °C with Kc = 0.042, what is the equilibrium concentration of Cl₂ if initial [PCl₅] = 0.10 M and no products are present?

7

Which action most effectively raises the boiling point of a solution containing 5 g solute X in 100 g water?

8

What is the significance of the solubility product (Ksp) for a sparingly soluble salt?

9

For a weak electrolyte with degree of ionisation α, how does α change when the solution is diluted (volume increased)?

10

Which redox couple has the larger standard electrode potential, Fe³⁺/Fe²⁺ (0.77 V) or I₂/I⁻ (0.54 V), and what is the resulting cell potential when they are combined?

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