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This blue-green is called malachite and copper can turn into malachite over many years of exposure to chlorine and oxygen. Cleaning Penny Experiment Teaching Resources | Teachers Pay Teachers What do your results tell you about the special properties of copper pennies? A chemical reaction between the vinegar and the salt removes copper oxide. This is because when the hydrochloric solution cleaned the coin and air dried it, it also took with it some of the salt. What do your results tell you about the special properties of copper pennies? This will help them understand whats going on. This is why most pennies you see look dirty or tarnished, its not actually dirt, but copper-oxide that makes them look so dull. I use this specifically to teach them the. What happens? Remember, you will be working with only the vinegar salt mixture and the catsup. Which one is still the dirtiest? Tomatoes contain naturally occurring citric acid, another acid that is generally slightly weaker than vinegar or lemon juice. Extra: Test whether these cleaning solutions work on other types of coins. The chemical reaction that dissolves the copper oxide on your pennies is an ongoing process. What do you see? Thanks a lot Meriley. She is an accomplished screenwriter, teacher and blogger. Dont be afraid to use all your senses. As they are exposed to the environment, pennies become coated with a layer of copper-oxide, making them look tarnished (dull, brown and dirty appearance). If you are doing this with older children who can write you can have them write out a grid for penny comparison. But we think that that alone could not clean coins this quickly. My kids had fun doing this, raiding their piggy banks to find some dirty pennies. Sign up to learn about our special events, clubs, camps, promotions and school programs. Drop the pennies into the soda. The step-by-step instructions included in this digital product are easy to follow and are accompanied by colorful illustrations that make the process even more engaging. After cups are put away, remove goggles. Do you notice any changes in the appearance of the pennies? Water is the worst because it is a neutral liquid, meaning that it sits smack in the middle of the pH scale. You can dispose of any extra ketchup how you normally would. So what just happened here? It appears, the salt breaks down somewhat, freeing chlorine ions into the solution. Can you think of other safe household acids you could test? Acids vs. Bases: Cleaning Pennies Experiment - Scientific AmeriKen You can only guess how highly acidic this ketchup must be! Science Fair Project Ideas for Kids, Middle & High School Students, Science Bob: Cleaning Pennies With Vinegar, Steve Spangler Science: Taco Sauce Penny Cleaner, Miami Museum of Science: The pH Factor/Cleaning Pennies. Leave them there for 10 minutes while you and your kids talk about the results of the first experiment. Whether you've got toddlers or grandparents to entertain, family nights are the p, Antique Christmas Houses for a Victorian Village Display, From sitting on brick firework mantles to placed underneath genuine fir Christmas trees, people have been displaying their ceramic or plastic holiday town scenes for decades. This bluish-green color is called Malachite. When you add chlorine in that mix, the color turns bluish-green instead! (we used our hands very messy business especially with the catsup but the kids thought that was fun!) 'Fire Water Balloon, 25-IN-1 BUNDLE (Set 1 of 2) - Grades 4,5,6, What is in this '25-IN-1 BUNDLE'? Next should either be the soda/fruit juice or vinegar (sometimes these switch depending on what type of each you have used) because their pH is usually around 3, so they are mildly acidic. This post contains affiliate links. These boxes are presented in partnership with Popular Mechanics so you know you'll be getting some great stuff each month. Chemical reactions, acidity, copper oxidation. The lab instructions are easy to follow and provide step-by-step guidance on how to conduct the, 5-IN-1 BUNDLE (Set 1 of 10) - Grades 4,5,6, What is in this '5-IN-1 BUNDLE'? Some common suggestions include: Plain water Soapy water Lemon juice Vinegar Vinegar with salt Ketchup Hot sauce Coca Cola Baking soda and water Apple, grape, or orange juice Milk Forming a Hypothesis Science Experiment: How to Clean Pennies - Teach Beside Me We use cookies to ensure that we give you the best experience on our website. Analysis and Graph - Cleaning Pennies They can also consider which might clean the pennies fastest. The following titles name the 20, /activities.Shake It! You have students write a hypothesis for what they think will happen in each solution and then let them soak. How do they feel? Penny Cleaning Science Fair Project for Eighth-Graders chemistry, kitchen science experiments, coin experiments. This activity helps students to see and experience the properties of water- including Adhesion, Cohesion, and Surface Tension. of salt and a bowl, preferably metal. The negatively charged oxygen atoms in our air are attracted to the positively charged copper atoms in the penny. All you need are pennies, water, dish soap, salt, and vinegar. Begin by pouring the vinegar into the bowl. Why do pennies get dark and dingy? Start with the cups labeled 1. Citrus JuiceTry a variety of citrus juices to see which works best or simply let your pennies soak in lemon juice. Experiments on Cleaning Pennies | Sciencing . It included a shiny new coin, one blackened and covered in ver, Smart Board Lesson for Beginning Learners, Introduce your students to the process of scientific experimentation, lesson. All you need is a couple of old copper coins, some different liquids and a few other tools. This is also why the salt and vinegar mixture was a better coin cleaner than just vinegar alone. By continuing to use the site, you agree to the use of cookies. The "Penny Cleaning Experiment" is a product that provides a fun and educational activity for children and adults alike.This product is designed to teach people how to clean old, tarnished pennies using simple household items such as vinegar and salt. CLEAN PENNIES WITH VINEGAR - ScienceBob.com Why or why not? Finally, after about 30 minutes to 1 hour, look at the coins again. Medioimages/Photodisc/Photodisc/Getty Images. Ketchup is a weak acid (from the vinegar), and this acid breaks down the copper oxide. The acids (usually vinegar - acetic acid) break the copper oxide free from the penny. If you have dirty, dull, or green pennies lying around, try the cleaning pennies science experiment to turn them bright again! Wipe the excess ketchup off the pennies, then rinse them off. It isn't just dirt, it is the result of the copper in the pennies interacting with oxygen in the atmosphere. Wait about 5 minutes, then remove the pennies from the solution. Materials: -pennies, fabuloso, ketchup, coke, lemon juice, paper . Place each of the pennies in the 1 minute column into their corresponding cup. The students have to come up, a question, make a hypothesis, conduct an, a conclusion. How do they smell? Make a paste from your baking soda and water. Post your question for our scientists. The chlorine ions bond with the copper in solution forming some sort of copper chloride, allowing the acid to break more of the copper oxide free from the penny. The pennies will be cleaner and brighter than before. Its exactly the same reaction thats happening to the dearly beloved Statue of Liberty! In this activity, were going to test a few different methods for cleaning pennies, and determine which gets our pennies the cleanest. Remember to be sensible and dont let them near any dangerous liquids like petroleum or bleach kids may come up with a few silly answers for fun, but as the adult, you need to draw the line at what is fun and what could be potentially dangers. When we clean copper pennies this way, we arent just rubbing dirt off of them. . Were there any cleaning methods where the time didnt matter, so the 1 minute and 5 minute pennies are equally clean? A coin collector prides himself on gathering pennies, but old tarnished pennies are an eyesore to anyone's collection. She's worked as a freelance copywriter and fiction writer for over a decade. Place your Control, 1 minutes penny into the Control 1 cup. Includes a 2-page student workshe, your class, whether on Presidents Day or another time of the year! Lab, Students of all ages have fun doing this easy, ! The pennies will be cleaner and brighter than before. Simple, any age students! Teaching kids about science doesn't have to be intimidating. Experiment with even longer periods of time with each of the cleaning methods. Wear safety goggles to avoid splash danger. Will using lemon juice and salt have better results than vinegar? All pennies start out the same color beautiful and bright copper. Not only will this, Use this observation handout when experimenting. This will help them to get thinking about the subject and soon, they will start to come up with their own questions. ', ' link: There are two different stages to this Science activity. A variety of products can be used to keep your pennies looking shiny and new. Be sure the penny is coated in whatever solution is in that cup. Pour enough of each solution into its corresponding dish to cover the pennies (it doesn't take much). (Or have a fun science fair project?) 3 clear cups. Before you start, its important to take note that for this cleaning coins experiment to work, you need coins made of copper; otherwise, this will not work. Make sure your child doesn't lick the pennies or try to eat any because ketchup is tasty. The salt helps speed up the reaction. Not only will you be improving them as an individual, you will also be strengthening the bond you share together. Compare the penny from the ketchup to the control penny. Teacher Notes: Regarding, : 1 colour page Check the coins, then come back again in another 30 minutes and see what has happened to the coins. Lesson and Program Overview: 2 colour pages So we proceeded to read the other ingredients and guess what we found? Thank you for sharing! Vinegar and SaltMake a solution of vinegar and salt and let the pennies soak. Place a square of clean, white paper towel in front of each cup. As an Amazon Associate I earn from qualifying purchases. The reason why ketchup is such a good coin cleaner is because it is made from tomatoes, and tomatoes are an acidic vegetable (yes, tomatoes are a vegetable). As you are drying them, you'll notice that rubbing results in some of the dirt coming off the pennies. Create a solution of vinegar and salt using one teaspoon of salt and 1/4 of a cup of vinegar. Observe paper clips next day. While copper is a beautiful metal, it is also reactive. Mix until the salt is dissolved (it helps if the vinegar is a little warm). In this experiment, if the water is corrosive enough to strip off the copper oxide then you will see the progress of the reaction by watching the pennies go from dull and dingy to bright and shiny. The vinegar cleans the penny due to the acid in the vinegar. Are you getting the free resources, updates, and special offers we send out every week in our teacher newsletter? So if you look at the coin in the vinegar solution, it made the old coin a little bit brighter and less brown. From Dull to Dazzling: Using Pennies to Test How pH Affects Copper Corrosion, Rustin Out: How Acids Affect the Rate of Corrosion, ! But what about the ketchup? Again, make sure the penny is completely covered by Ketchup. Examples: Vinegar, Coke, Mustard, Mayo, Juice, Milk, Lemon Juice, etc. Leave the coins in the liquid for 10 minutes. *Note: This activity works best if you use 10 pennies that are equally dirty. i thought that this was very helpful all five of my kids did this and they got an A so yea, gunna use this for my science project at school:D, well i think this experiment was welled organized but it could have showed more steps in the process of how they started from beginning to end also it could have said how long did it sit in the liquid, did they whip it off or not, showed what color was the coin at first etc, This is a great experiment im in 7th grade my science teacher was shocked. Make each cell (square) of the table large enough to place your penny in it after your testing is complete. Can you clearly see the date on the penny, or is it too dirty? Your email address will not be published. Penny lab experiment conclusion. Your kids will love this simple chemistry experiment. Encourage this and get them to write down their supposed answers. You should have observed that each cleaning method made the pennies cleaner, but some methods may have been more successful than others. But if you really want to dig in you can guide your children through the scientific method while doing this. Continue to place each penny in the 5 minutes column in its corresponding cup. Carefully remove each penny from its solution. ), and then explain why the salt and vinegar is the winner (sorry to give it awa, enrichment project during our money unit. Today is the day you take out your old coins and declare this day, coin cleaning day. 5. Plus, theyll learn some cool facts about metals, the pH scale, and the Statue of Liberty. Leaving your pennies in the cleaning solution longer gives the reaction more time to continue, and gives you shinier pennies! If you have chosen to do the extra second step with your kids, then you will have noticed upon your frequent checks that the coins will have turned a blue-green color after being left to air dry. This is a great activity for using just exploring and giving open-ended questioning. Great for President's Day! So in our case, we looked at the ingredients. While the coins are air drying in the second stage, you can talk your kids through their findings of the first stage together! It can be done relatively quickly and with multiple ages. Set one penny aside to act as your control. Which is the least clean? Always happy to help! Please supervise your children during all activities. Book a Science PartyHave the Science Guy visit your school! Penny Cleaning Experiment - Instructables Could you have cleaner pennies if you just used running water? For this experiment, you will need dirty pennies, paper towels, 1/4 cup of white vinegar, a tsp. Try other materials containing small amounts of acid to see which produces the best results. Its that dull dark. Grab a cup of coffee, some of that chocolate youre hiding from the kids, and join me as I learn, experiment, and explore with my kiddos and hopefully inspire you a little in your journey alongside smart, quirky, creative kids, too! In this activity were going to explore why pennies dont stay bright and shiny, and test different methods to bring the shine back! Keep trying, keep asking why, and keep learning. After several minutes . Coke contains phosphoric acid that cleans the oxides. One of my daughters thought that the pennies would get dissolved while my other daughter thought the soda would make the pennies dirtier. My goal is to encourage moms, find practical parenting solutions, and help moms with the unique challenges twins bring! This looks like a great activity to do with my kiddos! from Science Buddies http://www.sciencebuddies.org/science-activities. After the 10 minutes have passed, use the tweezers to take the coins out of each cup. Water from the tap is fine. TEN Quick and Easy Science Experiments for Kids! I'm giving you a shout out on the post. What happened to the coins when air dried? ), 20 Best Sensory Tables Ideas for Toddlers and Pre-Schoolers, Science Fair For Kids: The Battle of the Senses (Taste vs., solutions like ketchup and the salt and vinegar mixture, https://www.youtube.com/watch?v=WhAgQEr1LOE, Can Ketchup Clean a Penny? Well, after you wash the ketchup off, that is. 1/2 cup vinegar. Add the salt, and stir until the salt is completely dissolved. If you took a picture in Step 1, go back and compare each pennys cleanliness before and after being cleaned. Trust me on this. Avoid unsightly marks and scratches by learning how to clean sunglasses the right way. 3. After all the pennies have soaked for about five minutes, it is time to pull them out. What do you notice about each penny? Pop another coin in both the ketchup and vinegar and salt mixture. You can read more on the science behind how to clean pennies here: Clean your pennies with ketchup! Educational Toys And Child Development Research Studies. Cover the pennies with each of the mixtures, smear them around with your fingers, and give the ingredients at least 2 minutes to react. It also helps them practice graphing, determining independent and dependent variables, and analyzing experimental results. Instructions. Thanks for the rare idea to wash penny. Did you get to the same conclusion that the ketchup and the vinegar + salt mixture cleaned the coins the most? This product is designed to teach people how to clean old, tarnished pennies using simple household items such as vinegar and salt. also after an hour of the salt and vinegar, the salt made the coin super duper weird and worse. In fact, new pennies are so pretty that its considered a compliment to say that something is as shiny as a new penny. How to Clean Sunglasses Without Scratching Them. Make your own mix of vinegar and salt at different concentrations. Wait about 5 minutes, then remove the pennies from the solution. 10 very dirty pennies (the dirtier the better! Can you clearly see Abraham Lincoln? If you line up your pennies in order from the dirtiest to the cleanest, the order should go something like this: Water, Soda/Fruit Juice, Vinegar, Ketchup, and Vinegar and salt mixture. The project above is a DEMONSTRATION. Remove the pennies and rinse them with water. Younger kids might need a bit of help. After that you won't see anything happen. Record your results; photographs are helpful. Once you have completed the process dont be afraid to go back and work through it again. 'Fun, ' link: 9 Easy Grill Cleaning Tips to Keep Mealtime Fresh, At least two of the solutions from the above list, One penny for each solution plus one extra, One small dish or cup for each solution (plastic or paper cups with a couple inches off the top cut off will work if there aren't drinking glasses to spare). 12-Page Colour Download: This experiment can be performed with things generally found around the house, so it's a great choice for even a quick rainy day project. of salt and a bowl, preferably metal. 2 teaspoons salt. For example, ask them if they know you can clean pennies, why you should clean pennies, and what would be the best thing to use to clean pennies?