Wait a second!
More handpicked essays just for you.
Chemical reactions physical science
Essay protein synthesis
Don’t take our word for it - see why 10 million students trust us with their essay needs.
More handpicked essays just for you.
Chemical reactions physical science
Essay protein synthesis
Don’t take our word for it - see why 10 million students trust us with their essay needs.
Cadet Eric Wiggins Date: 18 September 2014 Course Name: Chem 100 Instructor: Captain Zuniga Section: M3A Identification of a Copper Mineral Intro Minerals are elements or compounds that are created in the Earth by geological processes. The method of isolating metals in a compound mineral is normally conducted through two processes.
The lab started off by measuring critical materials for the lab: the mass of an an empty 100 mL beaker, mass of beaker and copper chloride together(52.30 g), and the mass of three iron nails(2.73 g). The goal of this experiment is to determine the number of moles of copper and iron that would be produced in the reaction of iron and copper(II) chloride, the ratio of moles of iron to moles of copper, and the percent yield of copper produced. 2.00 grams of copper(II) chloride was added in the beaker to mix with 15 mL of distilled water. Then, three dry nails are placed in the copper(II) chloride solution for approximately 25 minutes. The three nails have to be scraped clean by sandpaper to make the surface of the nail shiny; if the nails are not clean, then some unknown substances might accidentally mix into the reaction and cause variations of the result.
Tyler White CHEM151LL 32658 04/01/2018 Different Types Chemical Reaction Types and Equations Purpose: The purpose of this lab experiment is to examine different types of chemical reactions such as Decomposition reaction, Synthesis reactions, Combustion reactions, and different Chemical equations. The experiments were conducted online using Late Nite Labs. Materials: Because the experiments were conducted online there wasn’t any physical use of materials, only digital ones, for these labs to be performed. Only the registration for the website was needed to perform these online labs, as well as a desktop computer.
Conclusion: In Station 1- reaction 2, Station 3- reaction 1, Station 4-reaction 1, Station 5 reaction 1, Station 6-reaction 1 and 2, and Station 7- 1 and 2 there was chemical reaction because all of those mixed ionic compounds created a precipitate. However some solutions did not become insoluble and produce precipitates such as: Station 1- BaCl2 (aq) + KNO3 (aq) , Station 2- KNO3(aq) + AgNO3(aq) and KNO3(aq) + CaSO4(aq), Station 3- Na2CO3(aq) + KNO3(aq) , Station 4- NaPO4(aq) + KNO3(aq)
Q1 A reversible reaction is one which can go both ways. Reactants react to form products and products can form the reactants again. Under different conditions the reactants and products can still react but may just become a oneway reaction, however a reversible reaction will eventually reach a point of equilibrium where the products are reactant are produced at the same rate.
(1 point) What is the desired catalytic reaction and the primary undesired reactions and explain the enthalpy terms? The chemical equation representing the desired catalytic reaction is the selective hydrogenation of CO2 to produce methanol, which can be written as follows: CO_2 + 3H_2 → CH_3 OH + H_2 O In this equation, carbon dioxide (CO2) and hydrogen gas (H2) react in the presence of a catalyst to produce methanol (CH3OH) and water (H2O).
Chemical Reactions March 25, 2024 Marcia Rowe Instructor: Julie Wenz CHMY 105- Exploration of chemistry Introduction: The objective of the chemical reaction experiment is to gain familiarity with several types of chemical changes through the implementation of a series of tests. Chemical reactions are processes that typically involve a chemical change, where the initial substances (reactants) differ from the resulting products. The presence of an arrow indicating the product signifies the occurrence of a chemical change. This experiment involves making observations, collecting data, and recording the outcomes.
Initially a 1:1:1 mixture of an unknown acid, base, and neutral compound was obtained with the goal of being separated through extraction and then further purified through recrystallization. Since the mixture was a 1:1:1 ratio, this means the amount present was .333 grams for each compound as this is important for calculating the percent recovery from extraction. The percent recovery is the percentage of the original product that is recovered, in this case the percent of the initial 0.33g that is recovered. The basic extraction using NaOH yielded a crude amount of 0.226 g of the acid. The final mass was not measured until removal of the base occurred and the compound was dried for a week.
ST Report In the experiment, the problem was the contaminants that were affecting the quality of the water samples. To fix this issue, three scientists had to determine the contaminants that were present in the samples. One sample was from the school sink and the second sample was from an unknown source. The scientists conducted many tests to figure out what pollutants were present in the water.
The purpose of this lab was to provide a more visible representation of reaction kinetics through dye decomposition with differing concentrations of reactants and the addition of ions within the solution. On day one of the lab, a linear relationship between absorbance and concentration of the dye was determined by creating multiple samples of dye with differing concentrations and measuring their absorbance in a spectrophotometer. On lab day two, using a similar method from day one, the absorbance of different reactions was analyzed and the rate order of both the dye and NaOH were determined to be 1 through graphical data analysis. Additional ions were introduced as a part of the experiment and the effect of the addition of KNO3 slowed down
Lab Report By: Amiya Kamal 7B Purpose: The purpose of this experiment is to analyse different substances and see their reaction with each other substances. This experiment is also to examine the particle theory of each mixture.
The materials and methods used in this experiment are as written from the Laboratory Supplement of David L. Shultz. To properly prepare for the experiment, the materials needed were one stoppered shell vial or small Erlenmeyer flask for flies, seventy flesh flies (Sarcophaga bullata, ice-cold to anesthetize them), one wire test-tube rack (small mesh), a few paper towels to cut the flies on, one razor blade, one enamel pan, one thermometer, one grease pencil, one piece of plastic wrap, one large plastic beaker filled with crushed ice, seven large glass test tubes to hold reagents, homogenate, and centrifuged fractions, seven glass reaction tubes (small size, about three inches tall), and seven plastic pipettes (one milliliter and controls). When all
In this lab, a total of 9 reactions were complete, mixing 3 powders and 3 liquids. The powders were baking powder, baking soda, cornstarch. The liquids were water, iodine solution, and acetic acid. Of these experiments, 5 were chemical reactions and 4 were only physical changes. Of the powders, baking powder was the most reactive because it chemically reacted with all 3 liquids.
Lab Report Experiment 6 Rates of Chemical Reactions By Nikhola Mirashirova Lab Partner: Dina Abetova Section 3, Saturday October 31, 2015 Introduction Rate reaction is the measure of the change in concentration of the reactants or the change in concentration of the products per unit time.1,2 Rate law for this experiment: Rate = k(I-)m(BrO3-)n(H+)p There are several factors which affect the rate of reaction: catalyst, reactant concentration, and temperature.1,2 A catalyst is a substance that changes, increases or decreases, the rate of a chemical reaction but is not being used up during the reaction.3 It provides an alternative way, so that the rate of reaction changes.4 Catalyst, which is used in this experiment, is (NH4)2MoO (0.5 M).
o Last updated: Sep 23 2009 http://www.scientificamerican.com/article/what-is-an-exothermic-rea/ o Date of use: 15 February 2015 o By: Van Hecke G.R. o Last updated: 27 September 1999 http://chemistry.about.com/od/endothermicexothermic/ss/Exothermic-Reaction-Examples-Exothermic-Demonstrations-To-Try11.htm#step-heading o Date of use: 15 February 2015 o By: Helmenstine A.M. o Last updated: 5 February 2015 http://www.sciencedirect.com/science/article/pii/S036012859000598 o Date of use: 15 February 2015 o By: Zeng K. and Zhang D. o Progress in Energy and Combustion Science, Volume 37, Issue 5< September 2011, Page 631 http://www.ngopulse.org/article/use-gas-safely-home-summer o Date of use: 15 February 2015 o By: Kulati P. o Last updated: 3 December 2014 http://www.propane101.com/carbonmonoxideandpropane.htm