19. (1 point) balance the following chemical equation: fe o₂ → fe₂o₃ what is the coefficient on fe, o₂ and fe₂o₃ *
1, 2, 3
4, 3, 2
1, 3, 1
2, 1, 1
20. (1 point) the law of conservation of mass lets us know that in every chemical equation you have to have the same number of on both sides of the equation. *
moles
coefficients
atoms of each element
molecules
21. (1 point) in order for the reaction: ca cuso₄ → cu caso₄ to occur, which of the following must be true? *
cu must be above ca on the activity series.
ca must be above cu on the activity series.
heat must be applied to the reaction.
none of the above

For questions 1 and 2, consider the following experimental data. hydrogen emission lines were detected at the following wavelengths (in nm): 121.6102.697.395.093.8question 1use the electromagnetic radiation classifications below and figure 1-1 in the introductory information for this lab (in the lab manual) to determine the nf value for the experimental data provided? wavelength, ? (nm) 650 700 550 600 400 450 500 visible spectrum wavelength, ? (m) 11 10 3 10 10 10 8 10 5 10 10 -10 10 9 10 10 10 10 -12 10 microwave radio infrared x-ray ultraviolet gamma 1020 1019 1018 1 1016 015 1014 01 12 109108 frequency, v (hz)a.1b. 2c. 3d. 4e. 5question 2using the data for the emission line with the longest wavelength, the known value of nf (from question 1 in this prelab), and the value of ni (deduced from the ? and nf values) calculate the rydberg constant for hydrogen (rh) in units of m-1.a) 1.097 x 10-11 m-1b) 5.921 x 107 m-1c) 1.097 x 10-2 m-1d) 9.252 x 106 m-1e) 1.097 x 107 m-1