A vertical wire stands upright on a map and carries a current vertically upward, out of the plane of the map. The magnetic field vector points toward the north. What is the direction of the magnetic force on this current due to the field?

A doubly charged ion (charge 2e) with velocity 6.9 × 106 m/s moves in a circular path of diameter 60.0 cm in a magnetic field of 0.80 T in a mass spectrometer.  What is the mass of this ion? (e = 1.60 × 10-19 C)

Simplify the expression  . Assume all variables are nonzero.

If a 25.0-g sample of a nonelectrolyte is dissolved in 145.0 g of water, the resulting solution will freeze at –0.89 °C.  What is the molar mass of the nonelectrolyte?   (Kfp for water is 1.858 °C/m.) A. 76 g/mol B. 290 g/mol C. 320 g/mol D. 360 g/mol E. 520 g/mol

4. Which is the best acid to use in the preparation of a buffer with pH = 9.3? A. CH3NH2 (Kb = 3.7 × 10–4) B. NH3 (Kb = 1.8 × 10–5) C. NH2OH (Kb = 9.1 × 10–9) D. C6H5NH2 (Kb = 4.3 × 10–10)

What is the pH of a saturated solution of Fe(OH)2?  For Fe(OH)2, Ksp = 8.0 x 10–16 . a. 9.93 b. 8.37 c. 7.23 d. 9.07 e. 10.15

Simplify   . Assume the denominator is not equal zero.

Write a balanced half-reaction for the reduction of CrO42–(aq) to Cr(OH)3(s) in a basic solution. a. CrO42–(aq) + 3 OH–(aq) + 3 e– -> Cr(OH)3(s) + 2 O2(g) b. CrO42–(aq) + 3 H+(aq) + 3 e– -> Cr(OH)3(s) c. CrO42–(aq) + 3 H+(aq) -> Cr(OH)3(s) + 2 e– d. CrO42–(aq) + 4 H2O(l) + 3 e– -> Cr(OH)3(s) + 5 OH–(aq) e. CrO42–(aq) + 3 OH–(aq) -> Cr(OH)3(s) + 2 O2(g)

Find the degree of the following polynomial    .

Which of the following is correct for the condensation of gaseous water at 88°C?  The normal boiling point of water is 100°C. a. ΔH < 0, ΔS > 0, and ΔG > 0. b. ΔH < 0, ΔS < 0, and ΔG < 0. c. ΔH > 0, ΔS < 0, and ΔG < 0. d. ΔH = 0, ΔS = 0, and ΔG < 0. e. ΔH > 0, ΔS > 0, and ΔG > 0.