Penny Lab Hypothesis

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

In my experiment, I compared if the side of a penny affected how many drops of water it can hold. I took 2 pennies, one on the head and one on the tails. I took a dropper and filled it with water. I then dropped the water onto the penny and counted how many drops of water it could hold until the water went on the paper towel. My hypothesis was that the tail side of the penny could hold more water, and it did. According to my data, the tail side average was about 1 whole drop away from the head average. This means that the tail side could hold more water. The exact average of the head side on the penny was 23 drops. The average of the tail side of the penny is 24.72727273 drops. That was super close. Although I made sure my hand was the same

To prepare the penny samples three pennies were obtained with one penny assigned to each group member. Each penny was weighed and their masses were recorded in the notebook. The year the pennies were made and the condition the pennies were in were also recorded in the notebook. In the fume hood each penny was placed into a 150 mL beaker. 25 mL of 6 M HNO3 was added to each beaker. The pennies dissolved and the remaining solutions were left to cool for 10 minutes. The three beakers’ contents were quantitatively transferred into three separate 100 mL volumetric flasks using a funnel. To make sure there was no loss of sample, the beaker was rinsed with 5-10 mL of water four times, each time the rinse solution being added to the volumetric flask. Still in the fume hood, 14 mL of concentrated ammonia solution was added to each volumetric flask using a graduated cylinder. The volumetric flasks were swirled to establish the blue color and dissolve any solids. If any

***Repeat steps 2-4 for each of the following: 5 mL of oil and 2 g each of cornstarch, sodium chloride, and sodium bicarbonate.

This experiment was performed to determine the difference in density between pre-1982 pennies and post-1982 pennies. In addition, we were given an unknown substance and our task was to configure what it was through calculating its volume,mass, and density. Furthermore, we were being introduced to the procedures of displacement in this experiment as well. All together, we were given the task of finding out why there was a difference in density between the two pennies. My partner, Michael Sapawa, and I first had to measure the mass of both pennies using a scale. Then we calculated the volume of the samples with graduated cylinders through the method known as displacement. We then applied our schema and drew out the formula for density, which

The purpose of this experiment was to see if a penny could hold more drops of salt water or tap water. It was found that a penny could hold an average of 22.3 drops of tap water and only 20.8 drops of salt water. These results are consistent with the hypothesis: If the salt concentration of water impacts the amount of water a penny holds, then the penny will hold less drops with salt water. While dropping the water onto the penny, it was observed that the water formed into a dome-like shape on the penny. It looked like the individual drops of water turned into one large drop of water. This was observed for both the tap and salt water. This happened due to the cohesion and surface tension of water. Cohesion simply means that water molecules are attracted to each other and want to cling together. Surface tension is the special term that is applied to the cohesion of water molecules.

The materials used during the experiment included three plastic cups, three gummy bears, masking tape, marker, balance, calculator, tray, one plastic spoon, a measurement tray, and a ruler. The three plastic cups were used to hold the tap water, salt water, and sugar water. The masking tape and marker were used to label each cup with the

The purpose of this lab was to make a substitutional alloy coating the penny in a gold color. The color of the penny depends on the Zinc and Sodium Hydroxide solution, and if heat was added or not. We took a copper penny and boiled it in a Zinc and Sodium Hydroxide solution. Then we took the penny out, rinsed it in water, and dried it off. Now the penny was silver. We then took the penny and waved it across a flame causing it to turn gold. Some errors that happened were getting Zinc in our water and over cooking the penny. These could be fixed by rinsing the Zinc off the penny in its solution before taking it out and not heating the penny for as long. A suggestion for improvement would be getting the flame at the lowest temperature possible.

During the first trial the penny held 17 drops of water. I used a dropper to put the drops of water on the penny very slowly while taking my time. In the next two trials it held 25 and 22 drops. In the last trial it held the most drops which was 30 drops of water. I think the last penny held the most

However, the results are completely different. The results shown in the table, the water and cornstarch solution is most suitable liquid to use in the snow globes due to its thick viscosity compared to other solutions. Hence, the marble traveled slower as it created more drag onto the marble. Nevertheless, the water itself had low viscosity compared to other solutions because the marble reached the base faster of the measuring cylinder. As a result, it created less drag onto the marble compared to water and cornstarch solution. Therefore, the thicker the solution, the longer it takes for the marble to reach the base of the measuring cylinder. However, if the solution has low viscosity (such as water itself), the faster it the time it takes for the marble to reach the

Pennies made before 1982 and the pennies that were made after them create a significant difference. Pennies made before 1982 are made of copper (Warnick 1). Due to the change of the of the metals over the time period it must of caused a change in the pennies mass. Therefore, the density of pennies created before 1982 and the pennies produced today have different densities. Density can also be used to identify unknown substances“Density is defined as the ratio of mass to volume”

It used mass, temperature, length, volume, density, and making a dilute solution. I learned the importance as well as the difficulty of making proper measurements in a lab setting. If one measurement is off, it will throw the entire equation off. This will give either incorrect or inaccurate results.

To start the process, I easily collected all the items I needed from my kitchen cabinet and sent my 5-year-old daughter to collect the dullest pennies she could find from her piggy bank. Once the items were all gathered together on the kitchen table, I started the experiment with both my children’s eager help.

1) Separate the solid from the liquid in the beaker by decanting the liquid. Ask your instructor to demonstrate the correct procedure.

In experiment two, “Hand-soaking,” I took the remainder of the salt water solution, which was approximately one cup and placed it into a cereal bowl. Into a second cereal bowl, I placed one cup of tap water solution. I placed one of my hands into the salt water solution and the other hand into the tap water solution. I let my hands soak in each of the solutions for 30 minutes and then observed the