1. Write out the net ionic equation for the reaction you performed in Formula Weight of a Copper Compound. Assume that you start with a Cu?- salt. Based on the reactions we have discussed, what type(s) of reaction does this represent? __( ) + ( ) → _ C + ( ) reaction type: 2. In a separate experiment, you determine that the percent-by-mass of Ag in a salt is 75.27 %. Assuming that there is one silver atom per formula unit, calculate the formula weight. The atomic mass of Ag – 107.9 amu. formula weight: amu 3. Write an equation for each of the following reactions. Construct an activity series based on these results. Include H2 in the series. (a) Zinc reacts with Pb 2+ ions to form lead metal and Zn2+ but silver will not react with Pb 2+ ions. (b) Both zinc metal and lead metal will react with H + (aq) from HCl to form hydrogen gas. Lead reacts very slowly. Silver will not react with HCl.

(b) Both zinc metal and lead metal will react with H + (aq) from HCl to form hydrogen gas. Lead reacts very slowly. Silver will not react with HCl. + + – + – →__ + (c) Potassium reacts violently with cold water. The other metals do not react with water. + → – (d) activity series: most active __>. least active 4. While preparing the solutions for Identification of Unknown Metal Ions, the stockroom workers were careful to use ammonium (NH4 ) or sodium (Na) salts when making the stock solutions of anions. Give a general rule as to why these cations were used versus others. Why?:

Ag* 5. For solutions of the cations Ag+, Ba²+, Mg2+ or Cuạt, the following experimental data were collected: NH: (aq) HCI (aq) H2SO4 (aq) No Change White ppt No Change No Change No Change White ppt white ppt No Change No Change Cu?- blue ppt; No Change No Change deep blue soln in excess Ba2+ Mg2+ (a) Write the formula of the insoluble barium salt: (b) What test would you use to determine if Ba2+ ion were present in a solution known to contain Ag+, Mg2+, or Ba?-? Explain. Reagent: Rationale: 6. These spectra represent what would be seen if discharge lamps of these elements were viewed through a diffraction grating. Based on the identities of these elements, why do carbon and helium have more lines than hydrogen?

6. These spectra represent what would be seen if discharge lamps of these elements were viewed through a diffraction grating. Based on the identities of these elements, why do carbon and helium have more lines than hydrogen? Carbon Hydrogen 4,000 Blue wavelength (A) 7.000 Red 7. The ‘orange’ line in the helium spectrum falls at 587.35 nm. What is the energy, in kJ/mol, of light at this wavelength? kJ/mol