Percent Yield Experiment

The law of conservation of mass states that matter can be changed from one form into another, mixtures can be separated or made, and or substances can be decomposed, but the total amount of mass remains constant. Taking this law from a different view we can state that the total mass of the universe remains constant. Whenever matter undergoes change the total mass of the products will be the same as the total mass of the reactants. For example, in this experiment sodium hydroxide and copper sulfate, the reactants have a total mass of 21.4 grams. The total mass of the products, copper hydroxide and sodium sulfate, was 21.13 grams. The 0.27 grams was a result of the solution staying on the thermometer that was used to measure the temperature. This law was formulated in the end of the 18th Century. It marked the beginning of modern history.

In the scientific method lab, I explored the different food options for mice in order to find the best one that will help them gain weight. To succeed in this lab, I needed to examine several types of foods including fruits, raw meat, cooked and uncooked foods. In this experiment I used cooked macaroni as a positive control and for the negative control I didn’t feed the mice any food, only water. The main objective of this study was to determine the best solution that will help me understand the metabolism of mice. All mice used in this study were given the same resources, but the only difference was the different types of foods fed to the mice to understand the changes of weight gain or loss between the mice.

Usually, the percent is a good amount less than 100 because of multiple factors including transfer between different lab tools and when an unfulfilled reaction takes place. In the case of this experiment, copper most likely was lost between transfers of the Copper (II) solution, although loss was attempted to be minimized. Also, after the reaction, the copper was filtered and some mass could have lost if the reaction was not fully carried out and all of the copper did not precipitate out of the solution. But, when the copper oxidized overnight on the heater, the reaction with oxygen added mass to the ending mass of copper. These areas of losing and gaining mass throughout the procedure equaled out in the end because the percent yield was very close to 100% as the actual yield was 0.7 grams of copper and the theoretical yield was 0.71 grams of copper. If the copper did not oxidize, it is believed that the percent yield would not have been as close to 100% as it was because the oxygen gave mass back that was lost along the way of the

E. What would happen if you dropped the object into the beaker while using the Archimedes’ Principle method instead of submerging the object?

How does photosynthesis model the Law of Conservation of Matter and the Law of Conservation of Energy ?

C. An unknown, rectangular substance measures 3.6 cm high, 4.21 cm long, and 1.17 cm wide.

To get the results of this experiment I had to use the Lincoln-Peterson Equation, and the Percent Error equation. To find the estimate population size using the Lincoln-Peterson Equation I had to use the number given in the first attempt which was 20 tester organisms I captured, and the number of organisms I captured from the second attempt which was 18 organisms and out of those only 8 were testers.

2. Fill in the blanks: Matter cannot be created or destroyed. Water, carbon, nitrogen, and oxygen must be recycled somehow in the environment, which also ensures that we do not use up or lose these essential materials.

the effects of various gases on water, to experiment if different gases would change the pH of liquid solutions. To carry out the investigation, three gases, nitrogen, oxygen, and carbon dioxide, were dissolved into 100 mL of distilled water each. While the gases were being added to the water, there were fast-paced bubbles speeding around because the gas was present in the bubbles. Once the liquid was saturated, it was, then, measured for any changes in pH. If the pH was at 7, the pH was neutral. If the pH was higher than 7, it was alkaline. Finally, if the pH was lower than 7, it was acidic. The independent variable was the type of gas and the dependent variable was

The chemical yield is a measurement of how efficient the organic reactant was synthesized into the desired product. The chemical yield will be lower if there are unreacted reactants or too many side products in the reaction. Unless the product was isolated properly during the distillation, it will negatively affect the chemical yield too. The chemical yield is measured by dividing the number of moles of product to the number of moles of reactant then multiplying it by 100 to get the percentage.

number in order from 1 to 100, the make of the car, the price when new

"The right answer is that the mostly of the mass is exhaled out as carbon dioxide," Meerman includes. "It disappears into thin air."

In Discovering the Secrets of photosynthesis, “van Helmont had placed a large pot at exactly 200 pounds of soil that had been thoroughly dried in the oven. Then he moistened the soil with rain water and placed a 5 pound willow shoot.” After this he water the plant everyday for 5 years. His results came in, he got a 164 pound plant. The soil only weighed 3 ounces less. This is an example of Conservation of Matter because the matter stayed

becomes a liquid and some may even evaporate but we know as it is in us to know that it is the same piece of

The purpose of this lab was to test the law of conservation of mass by comparing the total mass of the reactants in a chemical reaction with the total mass of the product.