Blog

Iodine-131 undergoes beta emission with a half-life of 8.02 days. If you start with [x] mg of the material, how long will it take for the amount of iodine-131 to drop to [y] mg?  Report your answer with 3 significant figures and the correct units.

What is the oxidizing agent in the redox reaction represented by the following cell notation? Mn(s) ∣ Mn2+(aq) ‖ Ag+(aq) ∣ Ag(s)

How many electrons are transferred in the following reaction? (The reaction is unbalanced.) You must balance the equation showing your written work to receive credit.  Co 3+(aq) + K(s) → Co(s) + K +(aq)

Determine the binding energy per nucleon of an Mg-24 nucleus. The Mg-24 nucleus has a mass of 23.985054 amu. A proton has a mass of 1.00728 amu, a neutron has a mass of 1.008665 amu, and 1 amu is equivalent to 931 MeV of energy.

Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. (The equation is balanced.) 2F2(g) + Mn(s) → 4 F⁻(aq) + Mn2+(aq)F2(g) + e⁻ → 2 F⁻(aq) E° = +2.87 VMn2+(aq) + 2 e⁻ → Mn(s) E° = -1.18 V

Given the following rate law, how does the rate of reaction change if the concentration of Y is doubled? Rate = k [X][Y]

Determine the molar solubility for Ag2C2O4 in pure water. The Ksp for Ag2C2O4 is 3.5 × 10-11.

Determine the identity of the daughter nuclide from the alpha decay of Rn.

What is undergoing reduction in the redox reaction represented by the following cell notation? Cr(s) ∣ Cr3+(aq) ‖ I2(g) ∣ I⁻(aq) ∣ Pt

Describe what changes occur during beta decay.