part A

part C

chlorine

chlorine treated with KBr & KI

Bromine

Bromine treated with KBr & KI

lodine

lodine treated with KCI & KBr

Part A: Density Trends within a Group - Predicted density of silicon using graph or equation. Use space below for calculations if you are using the equation of an Excel trendline. If you are hand drawing a graph, then include the plot with your lab report. Data for Water Displacement Method Mass of silicon pieces Volume of water in cylinder Volume of water plus silicon Difference = Volume of silicon - Measured density of silicon - Discuss your results on getting the density of silicon. \begin{tabular}{cccc} \hline Element & Atomic Symbol & Atomic Number & Density, g/cm \\ \hline Silicon & Si & 14 & ? \\ Germanium & Ge & 32 & 5.32 \\ Tin & Sn & 50 & 7.27 \\ Lead & Pb & 82 & 11.34 \\ \hline \end{tabular} Using a linear fit in which the y-intercept is set to zero, an equation is obtained that yields density (y) as a function of atomic number (x). To predict the density for an element in this group, use the linear equation by inserting the atomic number; the result will yield the predicted density. Atomic Number Mass of Si sample. Appearance. Volume of Si sample. Part C: Relative Oxidation Potentials of Halogens \begin{tabular}{|c|c|c|c|c|} \hline Tube & Initial Contents & Color of Upper Layer & Halogen Present in Upper Layer & Color Change? Redox Reaction? \\ \hline 1&2 & Cl2 & & Cl2 & N/A \\ \hline 3&4 & Br2 & & Br2 & N/A \\ \hline 5&6 & I2 & & I2 & N/A \\ \hline 1 & Cl2+KBr & & & \\ \hline 2 & Cl2+KI & & & \\ \hline 3 & Br2+KCl & & \\ \hline 4 & Br2+KI & & & \\ \hline 5 & I2+KCl & & & \\ \hline 6 & I2+KBr & & & \\ \hline \end{tabular} - Write a balanced REDOX equation for each tube that had chemical reaction. If there was no reaction, write out just the reactants and then "no reaction". Tube 1: Tube 2 : Tube 3: Tube 4: Tube 5 : Tube 6: - Rank the three halogens (as diatomic molecules) in order of increasing strength as oxidizing agents. Comment on the relationship of your ranking and the positions of the halogens on the periodic table. LEAST MOST