1. Balance the following equations.

___C3H8 + ___O2 = ___CO2 + ___H2O

________ H₂ + ______N₂ = _______ NH₃

___CaO(s) + ___H₂O(l) = ____Ca⁺²(aq) + _____OH^-(aq)

2. a) Calculate the frequency of light that has a wavelength of 562 nm. c= 3.0x10⁸ m/s. Include units.

b) Calculate the energy of one photon of red light that has a wavelength of 562 nm. h= 6.6x10^-34 J-s

.3. Calculate the oxidation state of the following underlined atoms.

a) O2

b) MnO4-

c) NH4+

d) K₂Cr₂O₇

e) Na₂O₂

4. a) 0.75 moles of CO2 = _____ g

b) 1.7 g of CaCO₃ = _____ moles

c) 4.7 L of 0.45 M NaOH = _____ moles of NaOH

d) 2 molecules of CO2 would weight _______ g

e) 3.7 x 10^-24g = _____ kg

5. 6.45 g of Na₂CO₃ is dissolved in 450 mL of water.

a) What is the reaction equation that describes this process.

b) What is the molarity of Na₂CO₃ in this solution?

c) What is the formula and concentration of each solute species in this solution?

6. A compound has the composition 86.6% Pb and 13.3% O; 0.83% H. What is the empirical formula of the compound?

7. The Bohr equation for the energy states of a Hydrogen atom is:

E_n = -2.18x10^-18/n²

a) What is the energy of an electron in an H atom with a principle quantum number 2.

b) What is the energy of an electron in an H atom with a principle quantum number 3.

c) If an electron in a H atom "falls" from a n = 3 state to an n= 2 state, what wavelength of light will be emitted?

8. Show logic that deBroglie used in arriving at his derivation of the Bohr assumption:

mvr = nh/2p (quantization of angular momentum.)