Observation Zinc Shot: Silver color, some pieces are shiny while the majority is dull. Tear shaped pieces (round at base with pointed top). No odor. Zinc Granular: Silver in color, semi shiny, flaky appearance. No odor. Zinc Sheet: Sheet of metal, flat pieces that are about 3 inches wide & 2 inches in length & 0. 02 inches in height. Each piece has a dull side and a shiny side. Silver in color, the dull side has a darker shade of gray. No odor. Zinc Powder: Gray very fine powder. No odor. Potassium Iodide: Small white granular compound with visible crystalline structure. No odor present.
Zinc Mossy: Dull silver pieces with irregular shape. Some pieces are flatter then others. No odor detected. Iodine and Water mixture: Crushed iodine still visible in water. Over color of mixture changed from clear to clear with orange amber hue. Iodine and Mineral Oil: Crushed iodine slightly visible in oil. Dramatic change in color; oil changed from clear into rich purple. Iodine and Alcohol: No visible pieces of Iodine present in solution. Change of color from clear to dark brown. Potassium Solution and Iodine: Immediate reaction between the two components. Mixture changed from clear to dark brown.
Iodine smell noticed. Zinc and Water: No reaction observed. Zinc sinks to the bottom of test tube filled with water. Zinc and HCl: Interaction between Zinc and HCl caused the once clear HCl to become white in color. Visible bubble can be observed around the Zinc metal. Results I2 + H2O I2 + Alcohol I2 + Min. Oil I2+Potassium Zn + H2O Zn + HCl Soluble Y Y Slightly Soluble Y Y Insoluble Y Y Trial Number Total (g) of Zn Total Water Displacement(mL) 1 10. 01 1. 9 2 20. 02 3 3 30. 03 4. 8 4 40. 04 6 Focus Questions 1. The appearance and solubility compares well with the information presented from the CRC Handbook.
Our test results shows that Iodine is insoluble/slightly soluble in water, and soluble in alcohol, potassium, and glycerin just like the data from the handbook. As for Zinc, our recorded data shows that Zinc is insoluble in water, and soluble in acids which also matches the data from the handbook. 2. The graphical shape of the graph obtained is linear, and the mathematical equation for that line is y = 7. 1x -2. 62. The slope, m = 7. 1, shows us the density of zinc and the space it occupies. Post Lab 1a. The measured volume of zinc will be greater since the occupied space will also include trapped air molecules. b. Assuming that the volume would be greater, the measured density of the granules will be smaller. 2a. The slope of the line in the graph plotted signifies the density of the object measured. Since the slope is calculated by dividing the change in y by the change in x, a simple manipulation of data such as making the y values hold the values of displacement and x values the mass will yield the calculations of density which is mass divided by volume. 2b. My y-intercept is similar to the amount of water displaced. 3. D – 7. 14g of zinc occupies 1 mL in volume. 4.
By flattening an object you create more surface area and thus increasing the volume of space it can cover. A metal ship is able to float on water because of volume of water displaced. The buoyant force pushing upwards on the ship acts greater with greater volume. 5. According to this graph, Lead would had a higher density compared to Zinc because of its steep slope which indicates a greater slope. Confidence Report We are confident with the data obtained from the solubility section due to its data similarity when compared to the CRC handbook of chemistry and physics.
As for the density portion of the lab, each trail consisted of a double weigh in to insure accurate measurements. The 15 mL of water was measured by me and my partner Svita. The Zinc vs Displacement graph and tread line is an accurate representation of what was done that day; I’m pretty confident about the graph because of our super helpful lab instructor who did not hesitate to help us in the most super way. What If What if we switched the x and the y values. The slope obtained would be the inverse of the density, but what can we say about the y-intercept.