What is the change in enthalpy when 11.8g of iron reacts with 2.7L of O2 at STP? 3 Fe + 2O2 = Fe3O4 H= -1120.48kJ

Calculate the frequency of a wave in a spring toy. the wave has a speed of 1.1 meters per second and a wavelength of 0.1 meters. *

Light waves can move through , but they travel fastest when they move through a(n) .

The data below were determined for the reaction shown below. s2o82– + 3i – (aq) → 2so42– + i3– expt. # [s2o82–] (m) [i –] (m) initial rate 1 0.038 0.060 1.4 × 10 – 5 m/s 2 0.076 0.060 2.8 × 10 – 5 m/s 3 0.076 0.030 1.4 × 10 – 5 m/s the rate law for this reaction must be: