Zinc Mossy Lab Report

The penny sample is next. Initaly three pennies were picked out, observed, weighed, and recorded. Then placed into the fune hood were three beakers with 25mL of 6M HNO_3 and one penny each. The reaction made by this process

The dependent variable in the experiment was the temperature and energy absorbed by the water.

Due to this fact, the concentration of copper in the solution is able to be calculated by using light absorbance. Since zinc doesn’t absorb any light, we are able to deduce that the greater the absorbance, the greater the concentration of copper.

In this lab, there are two days. In the first day, there are is part A and part B. Part A is further divided into three experiments. In experiment one, we were to figure out the heat capacity of the calorimeter that we made. The next two experiment’s goal was to calculate the enthalpy of 2 reactions and using hess’s law, figure out the heat of formation of magnesium oxide. In a reaction, there are

One of the most important skills to have in the chemistry lab is the understanding of how chemicals will react. Knowing for example, how a chemical will react with a metal, is an excellent way of determining the amount of a particular metal in a deposit. This knowledge was used in this lab to determine the amount of copper in an unknown sample mixture. It is also known that the determination of the percent concentration of a certain solution, will directly effect the percent transmission and absorption of a solution, dependent upon its dilution. By first testing known concentrations of a solution, and plotting this information graphically, a line is formed

In this experiment the scientists are looking for how gas production is effected when different sized Alka-Seltzer tablets are put into water. The independent variable is the different sizes while the dependent variable is the amount of gas produced. A constant variable includes the same brand of Alka-Seltzer tablets, the volume of water and same starting temperature. Finally the scientist’s control variable is the first trial testing the whole tablet comparing its reaction time to each new piece.

The control experiment for this investigation will be the experimental setup of 5 trials using 5oC as the temperature. All the steps in the method will be followed.

Penny A stayed the same, while penny B had a chemical change. The penny started to turn green by the vinegar that was put on it. The vinegar is a chemical and caused the penny to change chemically. Even though the penny still looks like a penny, the reaction from the experiment clearly showed that the change was a chemical change (a substance that is turned into something new). A reason that the penny that was in vinegar changed so much, compared to the penny that was in water is because of oxidation. Oxidation is when metal reacts with oxygen in the air to produce metal oxides. When exposed to air, the metal loses electrons and changes different colors. Due to this, the metal has lost electrons to oxygen, which means the metal has been oxidized. This is how the penny turned a different color. The penny was combined chemically (the vinegar) with oxygen, which made it become oxidized. Penny A stayed the same because the penny was not being affected by anything that was a chemical or an acid, like vinegar. Thus, the penny that was in water was not oxidized and did not turn a green color. Therefore, the reason that Penny B was affected differently than penny A, was becasue penny B was affected by oxidation and was chemically changed, while penny A was

The purpose of this experiment was to find, compare, and contrast the mass, volume, and densities of copper and zinc pennies. Information about the pennies was acquired before the start of the lab. The pre-lab research stated that any pennies that were minted before 1982 are composed of pure copper, while any pennies after 1982 are made out of zinc. The densities of copper -- 8.96 grams per centimeters cubed -- and zinc -- 7.13 grams per centimeters cubed -- were also information that was acquired before starting the experiment. With knowing the density of the two metals, this hypothesis was formed: If the mass and volume of pennies made out of zinc and copper are both measured, then the copper pennies will have a greater mass, because copper has a greater density than zinc. This hypothesis was formed because density equals mass over volume and if the mass is greater in an object that has the same volume, then the density of the object will be greater than the other.

In this lab we will be heating up substances and use them to galvanize pennies. When you heat up the zinc, and then coat the penny in it, it then galvanizes the penny. Meaning, it helps protect the penny from oxygen and water. Afterwards, you will need to record data such as the mass of the penny. This helps keep track of what physical traits are being changed during this experiment. On part B of this experiment, you will be heating up the now galvanized pennies in order to see what reaction you get. The reaction you should receive from heating up the now zinc-covered pennies is that the pennies will change color.

Are pennies better clean or dirty? Clean, of course. Clean pennies are probably used more than dirty pennies, but maybe just clean all the dirty pennies with the products: orange juice, coca cola, and taco sauce and see which one cleans the pennies the best, so then just use those. If any of these products cleans pennies, then coca cola will clean the pennies the best. For independent variable it was the products and the dependent variable is the clean pennies. The control group is the coca cola and the experimental group is orange juice, coca cola, and the taco sauce. For this experiment there was only a few steps to do in order to have clean pennies. After all the materials are ready then pour the products into cups and put at least two pennies in each product. Once the products are in the cups then set timer for 30 minutes and repeat this step for three trials. Collect the weight of the pennies after 30 minutes each time and write it down to see which of the products took off most of the dirt on the penny. Collect all the other data that is needed. This is just one way that cleans pennies but

Zinc chloride is an ionic compound. An ionic compound is made up of two elements, a metal and non-metal. They also consist of positive and negative ions. When an ionic compound is formed the ions bond to make a zero charge. The second element (the non-metal) is named by adding –ide to the end of it, providing it is a monatomic ion. The mixture of zinc chloride contains a metal (zinc) and a non-metal (chloride). Zinc has a charge of +2 and Chlorine has a charge of -1, so it consists of a positive and negative ion. Thus when zinc and chlorine combine, it actually takes 2 chlorine ions to bond with 1 zinc ion. This would give the formula a zero charge, and also make it an ionic compound. Finally, the name of the non-metal ion is chlorine, in this experiment it becomes chloride, adding –ide to the end also is proof it is an ionic compound since this is a bond between a metal and non-metal, and since there is no prefix in the name.

2. (5 pts) List and explain the names and affiliations of the various characters/stakeholders in this story – I’m looking for us to use the story to map out the complexities that are generally associated with solving public health puzzles – the stakeholders you list and explain here should apply to many of the cases we consider going forward.

When the zinc was added to the copper (II) sulfate solution, the solution started to bubble. As the solution was stirred, it turned a cloudy blue. Small flecks of a brown solid were visible. As the solution became colorless, the brown solid settled to the bottom of the beaker. The solid formed was copper in its elemental state. The color faded from the solution as the copper ions slowly formed into solid copper. The copper was poured into a funnel with filter paper and washed three times with 25 mL

Determine the change in temperature for each reaction. Show work here and record your answer in Data Table 2.