Find the wavelength of a photon of light with energy 2.04 eV. Express your answer in meters. (h = 6.63 x 10-34 J. s; c = 3 x 108 m/s; 1 eV = 1.6 x 10-19 J)

What are transitions between a liquid and gas called? identify which way they are transitioning

Is a pencil falling to the floor anon contact force, a force, or a contact force

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]