Lab Report Chemistry Eei

The mole is a convenient unit for analyzing chemical reactions. Avogadro’s number is equal to the mole. The mass of a mole of any compound or element is the mass in grams that corresponds to the molecular formula, also known as the atomic mass. In this experiment, you will observe the reaction of iron nails with a solution of copper (II) chloride and determine the number of moles involved in the reaction. You will determine the number of moles of copper produced in the reaction of iron and copper (II) chloride, determine the number of moles of iron used up in the reaction of iron and copper (II) chloride, determine the ratio of moles of iron to moles of copper, and determine the number of atoms and formula units involved in

Water: a necessary facet to all living things. For animals, water can be a home or a drink. As for humans, the uses of water are endless. Not only do we use water as a beverage or washing clothes or dishes, but we also use water for toilets, various kinds of plumbing and other things that aren’t as easily identifiable. As of 2005, this 70% of our Earth has been manipulated and used for thermoelectric power (41.5%), irrigation (37%), domestic affairs (8.5%), public supply (5.4%), industry (5%) and aquaculture (2.6%).1 The importance of water is infinite, not only to our way of life, but also our lives. We need to drink water to ensure the health of individual cells of the body, lubricate joints, moisten mucous membranes of the organs and many other vital bodily functions.2 Not only do we expect the availability of water, but it is highly important to humans and all living things. Although it is such an integral part of our Earth, one may ask about some of its properties and characteristics.

In a test tube, 0.5mL of the sample will be added with 0.5 mL of water and shaken vigorously. Take note for its solubility by parts (0.5mL is one part). Keep adding parts of the solvent until the sample is soluble. If not, add until ten parts of the solvent and determine its solubility. To separate test tubes, water will be replaced with ethanol, chloroform, ether, and acetone as solvents. Same procedures were

In the method of continuous variations the total number of moles of reactants is kept constant for the series of measurements. Each measurement is made with a different mole ratio of reactants. A mole ratio is ratio between the amounts in moles of any two compounds involved in a chemical reaction. Mole ratios are used as conversion factors between products and reactants in many chemistry problems.

October 17, 18, and 19, samples were collected from multiple sites along the BSR. The class was split into groups, and samples were collected from seven separate locations along the river and WWTP. There was also a sample collected by the S which is located between sites four and five. For each of these sites, there were ten groups from other labs that also collected a sample from the BSR. At site two of the river, the location included multiple sources of possible contamination. A drainage site was located 200 yards upstream, along with a small PVC drainage pipe next to the collection site. Not only was there drainage running into the river, the site was under a bridge, and contained other trash scattered throughout the area. The

The main focus for this lab is to determine why and how water is so essential to life. To begin with, water transports molecules around the body which is in fact very important because afterwards the body gets rid of any waste or toxins in which is unecessary for the body to keep. In addition, water keeps many ogranisms alive and growing, water can range in three different tempetures such as; solid, liquid and gas, in the end all of these occur on the earth. Waters scientific term is H2O which conclude; hydrogen and oxygen atoms, hydrogen is known to be a positive charge and oxygen has a negative charge and together end up having no charge, which makes the molecule polar. The purpose of this study is to dive deep and determine waters importance to life and why it is so essential.

Label three test tubes A - C and place them in a test tube rack. Using a graduated beral-type pipet and add about 2 mL of the cobalt chloride solution to each test tube A - C. Make sure a pipet is used to measure so that all volumes are equal. Place A in an ice bath, B in boiling water, and C should remain a constant temperature. Add HCl to each and observe.

A Cobalt-Amine-Halide compound is synthesized from cobalt (II) chloride hexahydrate. An orange-tinted solid is produced and is considered to be unknown since the specific ligand amounts are unknown. By determining the percent composition of various elements and compounds in the unknown, its true identity can be predicted. Chloride, ammonia, and cobalt are three examples of percent compositions determined to help narrow the selection of possible unknowns. Titrations using Na2S2O3 and HCl to determine percent cobalt and ammonia, respectively, are used. Silver nitrate is used to precipitate the chloride ions in the unknown, which can be measured to determine the percent composition of chloride

Introduction Chemical reactions are affected by the acidity of the solution in which they occur. pH can determine whether or not the reaction occurs, and whether it occurs at an appropriate rate, and must thus be controlled. Biochemical reactions are especially sensitive to pH. Molecules contain a group of atoms that may be charged or neutral. Whether or not the molecule is charged depends on the pH, and has an affect on the biological activity of a cell. What is the standard pH inside a cell?

There were four different experiments to conduct, which were observed in order to obtain data regarding the reaction and outcome. For each reaction, a test tube is needed and the desired amounts of each substance to be used. A Bunsen burner, tong, and droppers were also needed to perform the experiments. Proper standard lab attire is needed to perform the lab, along with gloves, an apron, and protective goggles. This is to avoid any harm for each student.

This lab mainly focused on presenting 10 elements (2 unknown) that could be analyzed and then grouped together predominantly by metallic character. Each element was observed thoroughly and the findings can be seen in the above data table. By viewing the periodic table and observations, each element was labeled as either a metal, nonmetal, or metalloid, providing insight towards each element's physical properties and behavior with the two solutions, hydrochloric acid and copper chloride. The nonmetals, sulfur and carbon, did not undergo a chemical reaction with either solution.

I was hired to be a new chemistry teacher at the Forest Grove High School. When I got

Water is the most fundamental necessity for this planet, human life and thus for our civilization. There is no substitute for water, it is irreplaceable. It is a major concern for scientists, politicians, health worker and engineers, as even in this era of technology, potable water for most third world countries still remains a luxury. Yet, as described below, even developed countries may suffer from lack of quality water. Three articles from two quite different countries, published in the reputed news and scientific journals will be reviewed. The Gravity of the problems, causes and repercussions will be examined. The approaches to counter the water problems will also be evaluated.

Water is an essential resource for life which greatly influences our public and environmental health as well as providing the pedestal for most of our economic activities. Unsustainable use of fresh water resources, population increase, and the trend in industrial revolution have led to environmental degradation especially by the release of partially treated or untreated wastewater into aquatic systems. Thus, the global freshwater resource is at risk and majority of the problems that humanity faces in the twenty-first century are related to water quantity and/or water quality issues (UNESCO, 2009).

Water is a basic need and survival source that is essential to any living organism. The quality of water is a vital source to the environment in which both society and the natural environment depend on. Monitoring the water quality is tested and done regularly in regards to maintain a constant, safe, and reliable source. A knowledgeable approach to regulate and discover specific problems are done through testing. It is significantly important to test the quality of water for intended purposes, may it be irrigation, drinking water, or