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Consider the following hypothetical reaction: Q2 (g) + AX4 (g) → 2 QX2 (g) + A (g) ΔH = 23.4 kJ / mol Which of the following is true regarding this reaction? A) Spontaneous at all temperatures B) Nonspontaneous at…
Hydrogen bonds form between H2O molecules, but not H2S, H2Se, or H2Te. This explains why: a) H2O is liquid at room temperature while the other compounds are gases. b) H2O is more volatile than the other compounds. c) H2O has…
A researcher constructs a hypothetical reaction that follows a mechanism that uses the two reactions below: 3 Q2 + 2 AX4 → 2AX3Q + 2XQ + 2Q– 1. AX3+ Q2→ AX3Q + Q– 2. 2 AX4 + Q2 → AX3Q…
How many electrons does gold (Au) possess that have a quantum number l = 2? A) 10 B) 23 C) 30 D) 79 Explanation You must know that the quantum number l can take on four different values: 0, 1,…
In order to determine how much Ag(NO3) can dissolve in aqueous solution, which value must be known? a) Ka b) pKa c) the standard reduction potential, E°, for the silver half-reaction d) Ksp Explanation The solubility product, Ksp, is an…
What is the electron configuration of Ca in Ca(OH)2? A) 1s22s22p6 B) 1s22s22p63s2 C) 1s22s22p63s23p6 D) Explanation Calcium in Ca(OH)2 exists as an ion Ca2+. The electron configuration of Ca2+ is equivalent to Argon, with orbitals up to 3p filled…
An electrolytic cell consists of two half-reactions: Ag+(aq) + e– → Ag(s) E° = 0.80 Cu2+(aq) + 2e– → Cu(s) E° = 0.34 What is the standard-state cell potential for the electrolytic cell? a) -1.14 V b) -0.46 V c) 0.46 V…
When 1 mole of Cu2+(aq) is reduced to Cu (s), how many faraday of charge are required? A) 1 B) 2 C) 6.02 x 1023 D) none, charge is measured in Coulombs (C) Explanation For the MCAT, an electrolytic cell…
What species is oxidized and what is the oxidizing agent in the following spontaneous reaction? 2Au3+(aq) + 3Cu (s) → 2Au (s) +3Cu2+ (aq) A) Au3+, Au B) Cu, Cu2+ C) Au3+, Cu D) Cu, Au3+ Explanation For the MCAT,…
Which of the following statements most accurately describes the cell potential (Eo), change in Gibb’s free energy (ΔGo), and equilibrium constant (K) for a non-spontaneous chemical reaction? Eo < 0, ΔGo > 0, K < 1 Eo < 0, ΔGo…