Manganese dioxide is an inorganic molecule that can achieve this. The catalyst lowers the activation energy of the decomposition which is already noticeable without the addition of a catalyst. In our lab we observed that the Manganse dioxide had no effect on the reaction, however it should have a significant
Lab 4 – Energy Sources and Alternative Energy Experiment 1: The Effects of Coal Mining |Table 1: pH of Water Samples | |Water Sample |Initial pH |Final pH (24-48 hours) | |Pyrite |5 |6 | |Activated Carbon |6 |7 | |Water |5 |5 | POST LAB QUESTIONS 1. Develop hypotheses predicting the effect of pyrite and coal on the acidity of water? a. Pyrite hypothesis = Pyrite will contaminate the water source making it more acidic. b. Coal hypothesis = Coal will contaminate the water source making it more acidic.
* Substance D—white powder, melted around 104°C. 1. Conductivity (4 points) 2. Substance A – did not conduct as a solid, but did conduct (lights up the light bulb when the alligator clips are connected to the metal electrodes in the liquid) as a liquid and in aqueous solution. 3.
The piece of metal is then taken out of the boiling water and placed in a calorimeter which contains room temperature water. The heat that was absorbed by the metal is measured by the temperature change the metal causes in the room temperature water. James Joule was one of the first to determine the mechanical equivalent of heat. He did this in the 1870s using a calorimeter of his own invention. The energy (or heat) unit of the Joule was named after him.
Jose Flores 6th period 1-27-14 LAB REPORT Introduction: A substance can conduct an electrical current if it is made of positively charged and negatively charged particles that are free to move about and is called a conductor. The purpose is to figure out conductivity of substances and to check which one conducts electricity. The hypothesis is that sucrose would be the only one that could not conduct out of the other six solutions. Materials: The materials used in this lab where six solutions , napkins, 2 pairs of gloves, 2 cups (1 cup with distilled water and 1 cup with solid NaCI) and a conductivity meter. The six solutions are sodium chloride, hydrochloric acid, sodium hydroxide, acetic acid, ammonia and sucrose.
What are the identities of the substances found after electrolysis and heating? The identities of the substances found were Iodine, Iodide ion (I-), Triodide ion(I3-), Zinc metal and Zinc ion(Zn2+) Post Lab questions: 1. What did this experiment convincingly show about the composition of the white solid? I put that the experiment showed us the white substance was comprised of Zinc ions and iodide ions, and that the two ions and be separated back into their respective elements 2. During the electrolysis, a gray solid formed on the negative wire of the battery and the dark red solution formed at the positive wire of the batter.
Density of Pennies Lab Introduction “The one cent coin, commonly known as the penny, was the first currency of any type authorized by the United States.” (www.pennies.org, pg.1)The first penny was made in 1787, composed of pure copper. They continued to produce pure copper pennies until 1837 when they switched to bronze. In 1857 they began using copper and nickel. The composition of a penny changed twice more before 1982. The pre-1983 penny was made of an alloy of copper and zinc.
Spectrophotometer lab Michael Runge Abstract: This lab report contains an explanation of how to use a spectrophotometer to determine the concentration of copper within a penny. Included are all the data, graphs, and calculations made to determine the percentage of copper in a penny. There is also a materials list, along with instructions on how to duplicate this lab. Background: Designed by Benjamin Franklin, the penny was first minted in 1787 and made out of pure copper. Over time the penny has made many transformations, but in 1982 the United States stopped using fully copper metal pennies because the price of copper was more valuable than what a penny was worth.
B. The electrons flow from the zinc electrode to the chromium electrode. C. The electrons flow from the chromium electrode to the zinc electrode. D. Zinc is reduced in the reaction. _____ 15.
Matter and Chemical Reactions Pre-Lab Preparation: Purpose: The reason we are doing this lab is because we are trying to see what will happen. When you put copper and silver nitrate together. Also after that I will see if any elements reacted and if so which ones and what is the name of the compound they formed. Hypothesis: If I put the copper into the silver nitrate, then it will make some type of solid. Materials: copper wire AgNO3 solution Sandpaper Stirring Rod 50-mL Graduated Cylinder 50-mL Beaker Funnel Filter Paper 250-mL Erlenmeyer Flask Ring Stand Small Iron Ring Plastic Petri Dish Paper Clip Bunsen Burner Tongs Pre-Lab Questions: 1.)