Skills practice lab modeling radioactive decay with pennies. Samantha stahl chemistry 103 professor kimberly arnold experiment 2. In this experiment, you will use a graph to determine the density of post1983 pennies. And you should get the half life of pennies lab answers driving under the download link we provide. The first version of this lab is the regular ed version.
Contribute to the8thsignpennies development by creating an account on github. Repeat the experiment and then talk again after the pennies are shiny and rinsed. Since then, they have been made with an outside coating of copper and an inner core of a different metal. Isotopes of pennies lab paint valley middle school. Make sure you have at least ten data points for the line. Instead, let them determine the difference between the pennies, then hypothesize as to what other metal might be inside the post1982 penny. The lil divas love our experiments, so they were instantly intrigued by the idea of performing some experiments with our pennies. An alloy is a mixture of two or more metals dissolved in each other when molten or a metal and nonmetal fused together.
Either pre or post1982 pennies can be used for this lab as long as they are very clean and shiny. Where was the water at after you were done with inserting the pennies. In this lab, you will determine and compare the density of two sets of pennies by graphing mass vs. Density of pennies summary summary in experiment two, students were given three tasks. Carbon14 is a special unstable element used in the absolute dating of material that was once alive, such as fossil bones. Before the pennies go in the vinegar, talk about what they look like. In order to find the density of the penny, we first had to weigh it. Determining the percent copper and zinc in pennies from density lab report procedure. With your child, collect ten pennies and count them one at a time. Purpose think about what concepts you had to know in order to do the lab, and write the purpose including these concepts. Pennies skills practice lab observation containers with covers, large 2 pennies 100 procedure 1. Pennies made after 1982 are made from copper and zinc, they react a little less.
In the copper plating solution lab, you placed copper cu. First, rub the edge of the penny on sandpaper until the silver color is exposed. Chemistry a penny for your thoughts lab alloys background information pre1982 pennies are composed of pure copper. I use each year as an intro type lab when talk over properties of water. It can be fit into topics that include the scientific method, valuable properties of water, surface tension, activity of soap or naoh, or just a general fu. May 23 is lucky penny day, but pennies are fun any day of the year. The second version is an accommodated version of this document. You will need enough coins i use pennies for each person in the class, some sort of graph paper printed on an overhead, an overhead projector and a pen for the overhead. Then, you will use known density values to identify the metal used in the core. Fill the other 5 cups with about 2 tablespoons of water. Here is a cool list that details the top 25 most valuable pennies ever minted in the united states of america updated. Repeat step 2 with the pennies that are in the box. Measuring the density of pre1982 and post1982 pennies. Design a procedure to determine the density of post1983 pennies using the graphing method see analysis.
During 1982, the rising cost of copper caused a penny to cost more than 1. The penny lab that was done to find if the density of a post 1982 penny from the u. Carefully place the pennies into the graduated cylinder, record the final volume of the. Lab a pennies write up chemistry 110b experiment a penny. Copper penny oxidation lab by educationalresource tpt.
Shake the container several times and remove the cover. It is a great way to introduce or reinforce the concepts involved in radioactive decay. After you have finished the lab, you will have a chance to revise your explanations based on what you have learned in the activity. In this activity, soaking the penny in the zinc solution actually coats the surface of the penny with zinc atoms. Technically we had to find out how much pennies actually do weigh and how much volume they take up. You will then get results and make conclusions based on the results. Density of pennies lab report samantha stahl chemistry 103. The total mass of the pennies canister with pennies minus the mass of the canister is useful here. Never taste chemicals or other substances used for a lab experiment.
The percentages of copper and zinc in brass vary depending on the type of brass. This is an excellent way to teach the activity series of the metals. Pure copper metal is bright and shiny, but the oxide is dull and greenish. In table 1 as the number of pennies increased, the water displacement, it increased by 0. Free printable lab notebook with full instructions download in the free printable library. The purpose of this lab besides demonstrating chemical weathering, is to assess how well students are understanding the scientific method as well as their ability to think outside the box by taking content knowledge and applying it. The purpose of this lab is to accurately determine the densities of pre1982 and post1982 pennies. Molar volume of hydrogen gas lab alternative assignment makeup performed. Jan 31, 2020 pennies made in 1982 or earlier are made of solid copper, use them in this reaction to make it work even better. Now, while wearing gloves, pour the acid into the container so the pennies are completely. Learn vocabulary, terms, and more with flashcards, games, and other study tools. How to make gold pennies experiments steve spangler science. The halflife of pennies lab manhattan beach unified.
Complete the lab notes section of the free printable lab notebook available in the free printable library with your kids. The penny lab is a simple easy to do lab that students tend to enjoy. You will make a hypothesis and perform an experiment to see how many drops of water can fit on a penny. The halflife of pennies lab can you use pennies to demonstrate decay. The purpose of this lab besides demonstrating chemical weathering, is to assess how well students are understanding the scientific method as well as their ability to think outside the box by taking content knowledge and applying. This activity works well as an openended, inquirybased activity. Do not tell students before the lab what to expect. That is exactly what the unstable element carbon14 does. Unless youre a coin collector, you probably think all united states pennies are pretty much the same. A few old not shiny pennies 14 cup white vinegar 1 teaspoon salt nonmetal bowl paper towels. Archeologists find remains of ancient civilizations. Pennies get dull over time because the copper in the pennies slowly reacts with air to form copper oxide.
For this percent composition worksheet, learners carry out an experiment to determine the percent of zinc in a penny. To the casual observer, all the pennies in circulation do seem to be identical in size, thickness, and composition. Before you begin your work in the lab, try to explain these terms in your own words. This penny lab lesson plan is suitable for 10th 12th grade. Pin it its presidents day so i thought it was the perfect time to do some penny experimenting abraham lincoln is on the penny, after all. Clean a penny experiment for kids highlights your child. What were these bubbles composed of, and how did they form.
When you put the pennies in the vinegar, you should have observed small gas bubbles. Before 1982, pennies contained about 95% copper and 5% zinc. Fill a 100ml graduated cylinder to 40ml or enough to fully submerge the pennies with water, record the volume in data table. Isotopes of pennies lab you will do a lab that will deal with isotopes, mass number, and atomic mass. After 1982, pennies were made of zinc with a copper coating.
Do this on two pennies, then place them in the plastic container. The data set to be collected consists of the masses of a large number of pennies. Pennies made in 1982 or earlier are made of solid copper, use them in this reaction to make it work even better. Carefully empty the container on a flat surface, and make sure the pennies dont roll away. In the copper plating solution lab, you placed copper cu pennies in vinegar. In 1982, both the heavier brass coins and the lighter zinc coins were made. Have students make hypotheses on what they think is going to happen to the pennies when they add them to the liquids. The mass was figured out and two tests of volume were performed. Lab the purpose of this lab is to see the steps of the scientific method in action. Imagine existing more than 5,000 years and still having more than 5,000 to go.
Your procedure must be recorded in your lab report. Compare the densities of pennies minted prior to 1982 and pennies minted after 1982. Treasury was losing money in the production of pennies. Journal observations throughout the procedure in your notebook.
Its presidents day so i thought it was the perfect time to do some penny experimenting abraham lincoln is on the penny, after all. Lab a pennies write up chemistry 110b experiment a. Clean the pennies thoroughly of all oxidation using tarnex andor steel wool. You will do a lab that will deal with isotopes, mass number, and atomic mass. To download half life of pennies lab answers, you might be to certainly find our website that includes a comprehensive assortment of manuals listed. After quite some time, or after exposure to an acid, pennies will form copper sulfate, carbonate, and chloride salts, which gives pennies a green color. Always wear safety goggles when experimenting with chemicals soap. First, you need pennies that are dated after 1982, muriatic acid, a plastic container, and sandpaper.
Isotopes of pennium redlands unified school district. Beaker containing 40 pennies 100ml graduated cyclinder electronic balance procedure. They write a balanced equation for the chemical reaction they performed with the penny and hydrochloric acid. Penny lab lesson plan for 10th 12th grade lesson planet. In 1983, the us treasury started making pennies with a zinc core with a copper coating turns out they weigh less and cost less to make than their pre1983 counterparts, which were made with an alloy of 95% copper and 5% zinc.
How to make gold pennies experiments steve spangler. Each year i have a few groups who do not read the directions carefully and start putting soap on the pennies a drop at a time. You might want to wear plastic gloves when using tarnex. Over time, pennies form a layer of copper oxide on the surface of the penny, which actually protects it from further corruption. Density of pennies lab report samantha stahl chemistry. Snaddon c 103 lab february 7, 2016 density of pennies. Our library will be the biggest of the which may have literally hundreds of a large number of different products represented. The mass was found using an electric scale by dropping all ten pennies into a paper cup and weighing each. In this lab, my lab partner and i had to determine the density of pennies, the most recent change in the composition, and what element the second metal was composed of. When you place the pennies in the salt and vinegar solution, the acetic acid from the vinegar dissolves the copper oxide, leaving behind shiny clean pennies. The density of pennies lab report was completed in mr.
How to hollow out a penny science experiments wonderhowto. Describe how you determined the volume of each penny iii. Instead of making hollow pennies, copper foils with penny imprints are the result. The purpose of this lab is to learn how to create and interpret graphs. This demonstration is suitable for use in a large lecture class 75 students. Data table 1 trial mass of 10 pennies made before 1982 mass of 10 pennies made after 1982 1 123. Brassing a penny alloying copper and zinc wear safety glasses and aprons. Sample traditional lab report density of pennies hypothesis based on the instructions provided the density of pennies made before 1982 will be greater than the density of pennies made after 1982. Write at least two followup questions that could be tested using the penny technique. Check out the list below, some of these old coins are worth a ton of money. If you want other types of books, you will always find the half life of pennies lab answers and economics, politics, social scientific research, religious beliefs, fictions. Prior to 1982, pennies were made of brass, with a uniform composition 95 wt% cu 5 wt% zn.
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