In order to have valid results, your percent error must be equal to or below 3% and ours was below. Once we found our results to be valid, we compared our average density to the density of the given metals. The density of zinc, 7.00 g/cm3, was the closest density in range of our calculated density. Our procedure had to be adjusted three times in order to find accurate data. Our original procedure didn’t measure mass or volume correctly.
Lab Report- Grand Central Equation Introduction In this experiment, we created Zinc Iodide yet again. However, this time we did it through different means which caused a different kind of reaction. Better said, in this lab we learned that reactions can take multiple steps to go into completion. We also analyzed which was the more efficient way to generate Zinc Iodide. Focus Question Should chemists prepare Zinc Iodide, from its elements or from a Double Replacement Reaction between Barium Iodide and Zinc Sulfate?
This was done by taking small amounts of the unknown acid. It was then placed into capillary tubes and inserted into the Bibby Sterilin Device. Starting with a high plateau to find a quick melting point and then proceeding to find an actual melting point. The next experiment that aided in finding more characterizations of unknown #2651145-PLF13 was equivalent weight. In order to find the equivalent weight a titration of the unknown acid had to be conducted.
Chapter Two: Freezing Point Depression Measurements Purpose: The purpose of this lab is to measure freezing points and freezing point depression for several solutions. The freezing point depression constant (Kf) for p-xylene was calculated from freezing point measurements and used to estimate the molar masses of three unknown solutes in a p-xylene solution. The end goal of this lab experiment is to correctly identify these three unknown solutes. The molar mass of a solute is able to be determined through freezing point depression measurements because the increase in solutes disrupts crystal formation, requiring a lower temperature to form a lattice. This colligative property is important in many industries, but is clear to see when using ordinary salt to remove ice from steps or a driveway.
- A “compression” fracture means that the bone has broken into pieces, which could occur when something falls on the bone. 1.2 Describe the impact of specific
Our scale only measures to grams accurately, and could have not accurately represented the .68g of CaCO3, or we could have lost the solid precipitate in the process of the experiment. These errors could be reduced with a more accurate scale, as well as more experienced hands performing the procedure, or skilled hands, ie: we are novices at this lab, and training could produce more accurate
In part one of the lab we used a micro scale technique to derive an activity series for metals. With the use of this technique we measured the same amount of different metal nitrate solutions into each well. Then we placed a piece of metal in the other metal nitrate solutions. With the data we recorded we resulted our activity series for the metals. We resulted that lead, silver, and copper are the strongest oxidizing agents, and that magnesium and zinc are the weak oxidizing agents.
Transform the data into the a graph- Cumulative Mass of zinc in grams (y-axis) vs cumulative displaced water in mLs (x-axis) Confidence Report- My partner and I are very confident in our results gathered during is lab. The density of the zinc found during the experiment was 7.0 g/mL. This value is very close to the value stated in the CRC Handbook of Chemistry, which is 7.14 g/mL. As for our materials, the beakers and graduated cylinders where cleaned thoroughly to prevent contamination in our observations of zinc and iodine. The test-tubes used for the solubility tests of zinc and iodine were washed and dried as well.
A large problem that comes with earthquakes is landslides. A landslide is a geological phenomenon which includes a wide range of ground movement, such as rockfalls, deep failure of slopes and shallow debris flows. A landslide can occur in offshore, coastal and onshore environments. Along with landslides, earthquakes can cause fires by damaging electrical power or gas lines. In the event of water mains rupturing and a loss of pressure, it may also become difficult to stop the spread of a fire once it has started.
The other important independent variable that will affect the speed of the rate of reaction is the length of magnesium ribbon. We need to put enough Mg Ribbon into the HCL so that it doesn’t run out straight away but also so that the experiment stops by itself once the gas syringe has filled up. The reasons for choosing these two independent variables are that it would be too hard to try and find a catalyst for this experiment; a catalyst is a substance that increases the rate of a chemical reaction without being consumed in the reaction. Finding a catalyst for this particular experiment could take months never mind the amount of time we have been given for our experiment. The independent variable that I will change is going to be the hydrochloric acid, we will use 50ml of HCL at the following molarity concentrations; 2molar, 1.6molar, 1.2molar, 0.8 molar and 0.4 molar.