Zinc Essays

8. Balanced chemical equation for the formation of zinc chloride from zinc and HCl First, we set up the equation xZn(s) + yHCl(aq) → ZnxCly (s) + y/2H2(g) . We knew the empirical formula for zinc chloride is ZnCl8. Based on the law of conservation of matter, we got the balanced equation: Balanced equation: Zn(s) + 8 HCl(aq) → ZnCl8 (s) + 4 H2 (g) 9. Percentage Error Calculation: Experimental values: (1.8+4.34)/2= 3.07g (average mass) Accepted values: 2.67g ZnCl8 0.5g Zn x 1mol Zn/65.4g Zn

place. Lead had replaced Copper in the solution. Zinc (Zn), however, had replaced Lead thus leaving Copper to be the least active leaving Zinc to be the most active out of the three. In order of activity from least active, to most active, the metals would be lined up as following: Ag, Cu, Pb, Zn, Mg. From this lineup, it was be determined that hydrogen is more active than the elements silver and copper yet less active than zinc and magnesium. Zinc was able to replace the hydrogen present in hydrochloric

copper is no longer visible. We wanted to see for ourselves what happens to copper when we made many chemical changes and in the end what happened to zinc when the copper appeared. What we found out at the end is that the copper appeared again which tells us that the copper never left and was never destroyed. What we also found out that the zinc did not leave but it dissolved into the solution and displaced copper forcing it back into copper solid. Methods: On the first day,

Materials: Four different fruits (Apple, Zucchini, Lime, Cherry Tomato) Twenty-five pieces of zinc and copper (Fifty total, each about 3.5-4 cm

composition of copper in the penny has been diminishing since. For the next 145 years, the penny’s copper composition wavered between 95% and 88% until 1982 where the copper composition was reduced to 2.5% while the rest of penny was composed of 97.5% zinc. The reason for this drastic change of copper composition is unknown. However, the use of copper extends further than just penny composition. Copper is quite useful in many realms, especially construction, since it is both water damage resistant and

through the Bunsen burner where we noticed our penny turned gold and a little rainbow. I believe that we made silver and gold because the end results of our pennies were gold. After completing this lab our pennies turned silver because of the zinc and the zinc chloride. Then they turned into gold and a little rainbow because they were waved through the Bunsen burner. An example I can think of relating to this would be colored water. If I want red water all I have to do is add red food coloring to get

CuO was decanted twice, and H2SO4 was added. Zinc was then added to the solution to reduce Cu2+ back to its original form, and any excess Zinc was decanted. The liquid was decanted and the solid was washed with H2O to wash away any acid, and the solid was

Benefits of Zinc for Men: The mineral even can help us sleep better at night, which provides a host of additional benefits. Zinc became a household word as an ingredient in cold lozenges during the 1990s or you may remember those sunscreens from the 1980s that would turn noses white, but physicians and nutritionists have always known it's a mineral that's necessary for good health. Immune Function: Zinc earns its stripes by promoting immune function to fight illness, supporting healthy cell

lived in Baghdad and made a clay jar with vinegar and a copper cylinder inside with a iron rod sticking out. Batteries have definitely changed since then. In the 1800 an Italian physicist Alessandro Volta invented the voltaic pile, which was made of zinc and copper plates with vinegar with leather or pasteboard between each plate. The plates were stacked on top of each other. The bottom and top plate acted as the positive and negative terminals. This was the first time that scientists were able

It was presumed before the experiment that the location of the metal on the Activity Series chart would thus determine the reactivity of the metal. Copper, magnesium, iron, and zinc were all tested in the same five solution compounds; which included hydrochloric acid, sulfate, magnesium chloride, iron chloride, and zinc chloride. Observations of chemical changes within the reaction were recorded to describe the results of the reaction and each metal's reactivity. An example of a single replacement

Purpose/ Methods The purpose of this experiment was to determine the mass percent Cu2+ in a mineral sample (Malachite), and a rock sample (copper ore). Through the process of spectroscopy, the students were able to determine the percent of copper that each sample yielded. The students were also able to apply the information to the theoretical value of copper in malachite to determine the percent error of the mineral mass percent. Furthermore, the methods used in the experiment provide insight

We wanted to see how different substances affected this phenomenon. When we formulated our guiding question we made sure to preserve these intents in the language: how do foreign substances influence the bonding quality and strength (to the top of a zinc penny in specific) of water? Since these experiments were conducted in groups, we set up a few roles to

The Naica Mine is located in the Mexican State of Chihuahua (1). This mine is run by Industrias Peñoles and is a lead, zinc, and silver mine (1). The mines were discovered in 1794 by prospectors (4). The first valuable mineral found in the Naica Mines was silver, and the mines focused on silver and gold until about 1900 when zinc and lead grew to be more valuable (4). This was in the time of the Mexican Revolution, and revolutionary troops demanded money from the owners of the mine (4). One of the

Introduction/Purpose: This report discusses an experiment done with copper metal. Several reactions were ran with it, which produced different copper compounds to in the end finally recover the original amount of copper. This experiment is important because it proved the Law of Conservation of Mass. The Law of Conservation of Mass states that mass is neither created nor destroyed. So after the last reaction is done there should be the same amount of copper as there was before you began. Material:

Introduction Dental amalgams have been proven to a composition of an alloy of silver, copper, tin, and zinc combined with mercury which are dentally advantages when used (Wolff et al., 1983; Desmet et al., 1984; Shraim et al., 2011). ‘The Godfather of Amalgam’; Louis Regnart, added the mercury to solidify or strengthen a cement mix he made to make an amalgam. This mercury also assisted in preserving the cement mixture at liquid form to be used on human teeth (Eames, 1959). Then in 1959, the formula

Strategy Individual assignment BUSA 7413A- STRATEGY Cost leadership strategy Bonginkosi Dlamini Student no:375148 Table of Contents 1. Introduction …………………………………………………………………………………………………….3 2. Literature Review …………………………………………………………………………………………….3 3. Cost leadership Strategy ……………………………………………………………………………………4 4. Advantages of Cost Leadership Strategy ……………………………………………………….....6 5. Disadvantages of Cost Leadership …………………………………………………………………….6 6. Criticism of the cost Leadership Strategy

Have you ever wondered what would happen if a penny was to fall off the top of the Empire State Building and hit someone on their head? It seems that this occurrence may be deadly. Infact , there are many who believes that at a fall from that high an altitude, 1,259 feet (381 meters) not including the antenna spire, a penny has the ability to cause a serious injury or even kill pedestrian down below. Well in order to cause such damages, this would be the case if the penny was in free fall. Yet this

Copper ore Copper is typically extracted from oxides and sulphite ores which could be either chalcophite ,chalcocide or covellite and this ore contain about 0.5 and 2.0 percent of copper Concentration by Flotation • Copper ore consist of some of the unwanted mineral and the first step is to remove some of those, this is done by floth flotation • Then ore crushed by a series of cone crusher and further grinded into smaller pieces using milling equipment altogether with water to reduce the dust a

Investigating the Concentration of Iron (III) Thiocyanate Research Question: To determine the optimal effect (equilibrium condition) of manipulating the concentration of both reactants on the values of absorbance detected by a spectrophotometer at 540 nanometers, in between the forward reaction of Iron (III) Chloride (FeCl3) and Potassium Thiocyanate (KSCN). Background Information: I’m an IASAS theatre tech alternate and my main role is being the assistant stage manager, which puts me in charge

Zinc I 'm here to tell you about an element. It 's an element called zinc and can be found on the periodic table if you want to look it up. It was discovered in 1746 in Germany by a man named Andreas Marggraf. There is evidence that it was used back in ancient time to make brass weapons, armor, and shields. This atom contains 30 protons and 30 electrons. It can be found in the 4th period and has 4 energy levels. In the first energy level there are 2 electrons. In the second there are 8 electrons