General Chemistry II

Use this for “A second-order reaction has k = 0.500 M⁻¹s⁻¹. Starting at 0.100 M, find the concentration after 60 s and the first half-life.”

Use this for “A zero-order reaction has k = 2.00 × 10⁻³ M/s. Starting at 0.500 M, find the concentration after 100 s, the half-life and when A runs out.”

Use this for “With [B] held at 0.100 M, raising [A] from 0.100 M to 0.200 M raises the initial rate from 2.00 × 10⁻³ to 8.00 × 10⁻³ M/s. The reaction is first order in B. Find the order in A and k.”

Use this for “A rate constant doubles, from 1.00 × 10⁻³ s⁻¹ at 25 °C to 2.00 × 10⁻³ s⁻¹ at 35 °C. Find the activation energy and the frequency factor A.”

Use this for “The slow step is NO₂ + NO₂ → NO₃ + NO, then NO₃ + CO → NO₂ + CO₂ is fast. What rate law fits?”

Use this for “Kc = 0.50 for N₂ + 3H₂ ⇌ 2NH₃ at 400 K. Find Kp.”

Use this for “K = 2.5 × 10⁻³ for A ⇌ 2B. What is K for 2B ⇌ A, and for ½A ⇌ B?”

Use this for “Ksp = 5.4 × 10⁻¹³ for AgBr. Find its molar solubility in 0.020 M NaBr and in pure water.”

Use this for “Find the pOH and pH of 0.250 M methylamine, CH₃NH₂ (Kb = 4.4 × 10⁻⁴).”

Use this for “A buffer holds 0.200 mol HF and 0.250 mol F⁻ (pKₐ = 3.17). Find its pH, then its pH after adding 0.020 mol NaOH.”

Use this for “Find the pH of 0.250 M sodium fluoride, NaF. Kₐ of HF is 6.8 × 10⁻⁴.”

Use this for “20.00 mL of 0.120 M formic acid (Kₐ = 1.8 × 10⁻⁴) is titrated with 0.150 M NaOH. Find the pH at the equivalence point.”

Use this for “A reaction has ΔG° = −12.5 kJ/mol at 310 K. Find ΔG when Q = 25, and say which way the reaction runs.”

Use this for “Ethanol boils at 351.5 K, and its heat of vaporization is 38.6 kJ/mol. Find its entropy of vaporization.”

Use this for “For a reaction, ΔH = −92.2 kJ/mol and ΔS = −199 J/(mol·K). Find ΔS of the surroundings and of the universe at 500 K. Is the reaction spontaneous?”

Use this for “A cell has E° = 0.462 V and moves 2 electrons. Find ΔG° and K at 25 °C.”

Use this for “A current of 2.50 A runs for 45 min through copper(II) sulfate. What mass of copper plates onto the cathode?”, or the time or current a mass needs.

Use this for “One silver electrode sits in 0.0050 M Ag⁺ and another in 0.80 M Ag⁺, joined by a salt bridge. Find the cell’s voltage at 25 °C.”

Use this for “0.500 g of a protein in 100 mL of solution has an osmotic pressure of 5.20 torr at 25 °C. Find its molar mass.”

Use this for “A 2.00 M NaCl solution has a density of 1.08 g/mL. Find its molality and mass percent.”

Use this for “25 mL of 2.4 × 10⁻⁴ M AgNO₃ is mixed with 15 mL of 1.6 × 10⁻⁴ M NaBr. Ksp of AgBr is 5.4 × 10⁻¹³. Does AgBr precipitate?”

Use this for “Co-60 has a half-life of 5.27 years. What is the activity of 1.00 mg of it?”

Use this for “An O-16 atom has a mass of 15.994915 u. Find its binding energy per nucleon.”