snesavagea


 * Lavoisier a liar?**


 * Purpose**: The purpose of this experiment is to see if matter is neither created or destroyed during a reaction.


 * Data and Calculations:**
 * Reactants || Mass (g) ||
 * Mass of empty beaker A || 28.8237g ||
 * Mass of compound placed in beaker A || 0.7500g ||
 * Mass of empty beaker B || 28.0707g ||
 * Mass of compound placed in beaker B || 1.2057g ||
 * Total mass of compounds placed in beaker A & B || 1.9557g ||
 * Mass of clean filter paper || 0.8725g ||

We recorded the mass of each empty beaker and the mass the mass of the compounds placed in each beaker, all before the reaction. After the water was boiled off and the beakers cooled, we measured the mass of each beaker with the filter and compound, the mass of the compound recovered in the beaker, and the mass of the beaker and the compound. We also added the total masses of both A&B compounds. The total mas of compounds before the reaction was 1.9557 g and the the total mass of compounds after the reaction was 4.4198 g. The percent error of the reaction was about 126%.
 * Products || Mass (g) ||
 * Mass of beaker A & filter with compound || 31.8356g ||
 * Mass of compound recovered in beaker A || 3.0119g ||
 * Mass of beaker B & compound || 29.4786g ||
 * Mass of compound in beaker B || 1.4079g ||
 * Total mass of both A&B compounds || 4.4198g ||


 * Conclusion**: Our data collected showed that the mass before the reaction is different from the mass after. The mass after the reaction was greater than the mass before. This shows that mass was not conserved during the reaction. The difference in masses shows that Lavoisier was wrong. The average value calculations gathered from other groups was about 50 percent error.



Mendeleev: Predicting the Future?

Purpose: The purpose of this lab is to predict the density of the element Germanium by determining the density of the other metals found in the same column of the periodic table.

Data:
 * Element || Trial || Mass (g) || Volume change (mL) || Density (g/mL) || Average density (g/mL) ||
 * Silicon || 1 || 1.90 || 1 || 1.90 || 1.94 ||
 * Silicon || 2 || 3.80 || 2 || 1.90 || 1.94 ||
 * Silicon || 3 || 6.06 || 3 || 2.02 || 1.94 ||
 * Tin || 1 || 4.14 || 1 || 4.14 || 4.92 ||
 * Tin || 2 || 10.36 || 2 || 5.18 || 4.92 ||
 * Tin || 3 || 16.29 || 3 || 5.43 || 4.92 ||
 * Lead || 1 || 4.40 || 1 || 4.40 || 7.08 ||
 * Lead || 2 || 15.67 || 2 || 7.84 || 7.08 ||
 * Lead || 3 || 27.00 || 3 || 9.00 || 7.08 ||


 * Element || Period || Average density ||
 * Si || 3 || 1.94 ||
 * Sn || 5 || 4.92 ||
 * Pb || 6 || 7.08 ||

We calculated the density of Silicon, Lead, and Tin. We did this by using water displacement. We measured the mass of 25mL of water. Then we added the metal and calculated the volume change. To find the density then, we divided the mass by volume. We repeated these steps three times. To find the average density of the three trials of each element, we added all the densities and divided by three.

Conclusions: Collecting the average densities of Silicon, Lead, and Tin helped us predict the density of Germanium. The average density of the three elements is about 4.64 g/mL. Which means that the density of Germanium should be around 4 or 5.

I have two dogs



The graph shows which suspect to bring in to the police. Since the size of the shoe is 9.8 in., you plug that value in for y in the equation and solve for x. After solving, the value of x is about 63 in. in height. Penelope Paige's height is 64 in., so she is the suspect with the closest height to 63 inches.


 * Determination of a Hydrate**

First, we measured and recorded the mass of the crucible. We measured about 1.5g of the copper II sulfate in the crucible and measured both of them together. We heated the crucible with the bunsen burner for 10 min. We turned off the burner and let the crucible cool down.



We measured the mass of the crucible and its contents.



We heated the crucible for another five minutes.



We allowed the crucible to cool again.



We remeasured the mass of the crucible and its contents.

Drinking Water Combination Kit

First we put the Zinc Chloride solution in the dish and added pieces of Aluminum.

Then we added a fresh solution of the Zinc Chloride and added a piece of Copper.

We added another fresh solution of Zinc Chloride to the dish and added Iron.

We added Silver Nitrate solution to the dish and added a piece of Zinc. We added some Copper Sulfate solution to the tray and added Iron. We added Silver Nitrate solution to the dish and added a piece of aluminum. We added Silver Nitrate solution to the dish and added a piece of copper. We added Silver Nitrate solution to the dish and added iron.