Balanced Nuclear Equation

1. Lead-210 has a half-life of 20.4 years. This isotope decays by beta particle emission. a.) Write a balanced nuclear equation for the decay of lead-210 b.) What is the activity (in millicuries) of a 0.500 t sample of the isotope (atomic mass = 210.0 amu)? 2. Th-230 decays by alpha emission. a.) Calculate Δm in gram ...continues

Isotope GA-67

1. The isotope GA-67 is used medically to scan for various tumors. a.) Write the nuclear symbol for Ga-67 b.) How many protons are there in the nucleus? c.) How many neutrons are there? d.) Calculate ΔE in kJ when 1.00 of Ga-71 (nuclear mass of 70.9476 amu) is bombarded by an α-particle producing As-72 (nuclear mas ...continues

Balanced Equation

1. Calculate ΔG° for a reaction where ΔH° = -79.6 kJ and ΔS° = 433.1 J/K. 2. Write a balanced chemical equation for the overall cell reaction presented as Cd | Cd^2+ | | Ni^2+ | Ni 3. Which species in the following pair is the better oxidizing agent?

Oxidizing Agent

1. Which species in the following pair is the better oxidizing agent? Br↓2 or H↓2O↓2 2. Calculate E° for the following voltaic cell: Pb (s) + 2Ag^+ (aq) → Pb^2+ (aq) + 2Ag (s)

Initial Rate of Acetylaldehyde

1. The initial rate of acetylaldehyde, CH3CHO at 600ºC is CH↓3CHO(g) → CH↓4(g) + CO(g) Was measured at a series of concentrations with the following results: [CH3CHO] 0.10M 0.20M 0.30M 0.40M Rate(mol/L•s) 0.085 0.34 0.76 1.4 Using these data, determine the reaction order; that is, determine the value ...continues

Sketch Geometry - Calculate Concentration

3. Sketch the geometry of trans-Ni(H↓2O)↓2 (Cl)↓2 4. Calculate the concentration of Pb^2+ ions in equilibrium with 0.019 M Br^-.

Chemistry Equations

1. Consider a voltaic cell in which of the following reaction takes place: 2Cr (s) + 6H^+ (aq) → 2Cr^3+ (aq) + 3H↓2 (g) Calculate E° 2. An electrolytic cell produces aluminum from Al↓2O↓3 at the rate of 10kg a day. Assume a 100% yield. a. How many moles of electrons must pass through the cell ...continues

Calculate KE

1.) Calculate Ke for the following (equilibrium concentrations given below substances). See attached file for full problem description.

Dimensional Analysis

Typical rate of deposit of dust (dustfall) from unpolluted air was reported as 10 tons per square mile per month. Express this dustfall in milligrams per square meter per hour.

Fission and isotopes

1a.) You have 16 electrons, 16 protons, and 16 neutrons. You can combine them to make 8 Helium (He-4) atoms, 4 beryllium atoms (Be-8), 2 oxygen atoms (O-16), or one sulfur atom (S-32). What will you do to make the most stable product? Info: H-1 1.00782505 amu He-4 4.0026033 amu Be-8 8.0053052 amu O-16 ...continues