Penny vs liquid science project. Oct 13, 2019 · Another way to put a numerical value to it is to make up your own number scale. Using a fresh pipet, slowly drop individual droplets of soapy water onto the surface of the penny, as done in Part A. Pour the contents of the Water 1 cup into the Water 2 cup, catching the pennies with the strainer. It turns out, however, that the same process that makes the pennies shiny has bad Liquids & Fluids (Chemistry) Science Fair Projects & Experiments. Apr 18, 2024 · Paper towels. Make This A Science Project: There are many materials that can be used to “close” a circuit, or allow current to flow. The project could determine whether the separate liquids all mix together, or if you can control the density of these liquids to create layers of colors. People say that ketchup and taco sauce are good cleaners for pennies, but read the ingredients: "Tomatoes, Vinegar, Salt . In one cup, pour enough vinegar to cover the penny. Rinse the pennies with water, and dry them. The oxygen in the air and the copper in the pennies form an oxide that coats the pennies and makes them look dirty. Paper towels. Results Best to worst: • banana pepper juice • kosher dill pickle juice • grapefruit juice • cola • coffee. Measuring Surface Tension of Water with a Penny. Dry thoroughly with a paper towel. 4. Mix the salt and vinegar in the bowl, and stir it until the salt dissolves. Wait ten seconds. Even when shaken or stirred, the oil will separate from the water and float back to the top. The stronger the acid, the better it will clean copper May 10, 2018 · Cut out all the coin-size paper pieces. Gather 12 noticeably rusted pennies. I hypothesized that Lemon Juice would clean a coin the best because of it’s very strong acids. Repeat steps 1–12 two more times with your first acid, for a total of three trials. Ask an adult Apr 24, 2017 · Updated April 24, 2017. Copper easily binds with oxygen, creating the dirty-looking copper oxide layer on pennies. Wait for 10 minutes. Timer. Make the lid as secure as possible. He discovered that Cheer detergent worked best on mustard stains, but Tide detergent In a minute or so, the paper towel will sink, leaving the paperclip floating on top of the water. Test to see how the amount of vitamin C changes after the juice is exposed to air (or light or heat). STEP 2: Before dropping about 5 pennies into the bowl. Appearance. Add the layers one at a time, and add a drop of food coloring to the alcohol layer. Jun 19, 2016 · Salt. Green substance found on pennies is a form of oxidation. 0, while lemon juice has a pH level of 2. As students carry out and practice their projects, make sure that they comply with all of the health and safety regulations of the science laboratory or guidelines for safe fieldwork. For example, you could pick the shiniest penny you can find and call it 90% bright. Fill three beakers with 150ml (2/3 cup) of water. Count to 10 slowly and pull it out. Fold a paper towel so that it fits inside your dish. The copper chloride helps the vinegar further break down the copper Dirty pennies (the older, the better) 2 paper cups; Vinegar; Dish soap; Paper towels; Various other liquids from around the house (think ketchup, soda, etc. Pour vinegar over the pennies so that the paper towel is fully saturated. 9. Add 1⁄4 cup of vinegar to the second cup. 8. Soap and water won’t clean the pennies because oxidation is a chemical change. Dec 11, 2023 · Instructions. Ask an adult to help you cut and prepare small pieces (about 0. 5 grams (which is the weight of a single penny in grams). Place 2 tablespoons of baking soda in the second and third glasses, which have no pennies inside yet. Make sure you keep track of from which cup they came. For each liquid, use about 2 ounces (about one-half inch of liquid height). Wait at least ten minutes. Whether you realize it or not, chewing gum and bubble gum are very different. Explanation of what this experiment is about,how to do it, and what you can learn from it. The True Cost of a Bike Rack: Aerodynamics and Fuel Economy. Analysis. In fact, the cola was in 4th place as a cleaner. By Sharideth Smith. Salt is the magic ingredient in juices and liquids that cleans pennies (removes tarnish) well. Remove the paper towel, and record your findings of the paper towel absorbency in the notebook. Try the taco sauce to see which works better. Fill the bowls with different liquids, one liquid for each bowl. Calculate the mass and volume of hydrogen produced from the penny. 5 cm) of the rubber band, the Styrofoam, and the wax. As you found out when you cleaned your pennies, your mixture of salt and vinegar is really good at dissolving metals and metal oxides. red, and green water. Measuring How pH Correlates to Viscosity in a Non-Newtonian Fluid [ E] Vibrating the Oil-Water Mixture to Infer Water Cut [ E] The Effects of Vibrational Force on Dilatants [ E] 5 coins of each (5 pennies, 5 nickels, 5 dimes, 5 quarters) and few extra for the “control”. Put all the pennies in the first row, nickels in the second, dimes in the third, and quarters in the fourth row. As in ketchup, salt and vinegar are both in hot sauce. Copper oxidizes when exposed to oxygen and this process makes the penny look dirty. For example science fair participant Taylor A. EXPERIMENT STEPS. Scientific American offers some ideas for different liquids to use, and a more in depth explanation and method for advanced experiment-ers. Pennies become dull over time as copper on the surface Use the eyedropper to suck water up from the cup, then carefully drop one drop at a time onto the coin, keeping very careful count. In the six different bowls place each different solution. Rinse the pennies with tap water and place them on some dry paper towels. Step 5. The copper oxide comes from the pennies reacting with the oxygen in the air. This experiment is visually interesting to kids as the rust can be seen coming off the coins very quickly. In this lesson and its associated activity, students conduct a simple test to determine how many drops of each of three liquids can be placed on a penny before spilling over. Gas (Physics) Science Fair Projects & Experiments. Put Add 1⁄4 cup (59 mL) of water to the first cup. Step 3. My project clearly shows the banana pepper juice was the best cleaner. You will see a dome shape start forming by the puddle of water. This graph interprets the results of the experiment. Hold it there 10-15 seconds. Take one and dip it halfway into the bowl. The vinegar made its penny shiny. Place each of the pennies in the 1 minute column into their corresponding cup. If you are worried about getting water on the table or the floor, you can place a paper towel underneath the penny. If the experiment is to be done quantitatively, include the following steps: Mass penny before the reaction. Add food coloring to make blue. Step 4. Independent variable: This is the one you're changing in the experiment, so it's the type of solution that you're dropping on the penny. Gather materials and make copies of the Wet Pennies Handout. Use parental supervision with dangerous liquids. 5% Zinc, 2. Record the number of pennies the water could hold before the surface tension was broken. Place the penny on a fresh paper towel. Dependent variable: This is the one that you Oxygen in the air combines with the copper in the penny to form copper oxide, which makes the penny look dull and dingy. Pennies are made of copper. Nov 14, 2022 · Vinegar and Salt. Or test pH levels of objects around you or of products that you make. Materials: White vinegar Salt Five to ten copper pennies Paper towel Bowl or dish Instructions: Fold the paper towel so it is several layers thick and will fit inside your bowl or dish. Record the hypothesis on the worksheet. Add the green (pure) water drop-by-drop to the other two and record what happens. Fill a beaker with 25 mL of tap water. 1. Record the radius of your marbles in your lab notebook. Observe what happens with the pennies in each of the solutions. Apr 27, 2018 · Experiment With Covered and Uncovered Jars. The salt in the ketchup goes on to add dissolved chloride ions to the mix. Using the dropper, carefully put a drop of water in the center of the coin. Pour some water in a small container. Try using brass or other metal items. The Paper Plate Hovercraft. Next, pour one liquid into each cup. Aug 21, 2022 · What juice or liquid cleans pennies best?. Now, carefully pour the vinegar over the Make sure the rim of the glass is dry, so that water won't drip down. In each case, make sure the penny is completely covered by the contents of the cup. Gather all your materials at a workspace that can tolerate spills of all the liquids. Draw a picture of the jars, noting the current water levels. Compare the results to find that the sugar increases the viscosity of the water Jan 10, 2019 · Before the Activity. This easy chemistry project gets kids interested in STEM → science, technology, engineering, and math! Apr 25, 2017 · A simple Coca-Cola science fair project is to determine if Coca-Cola can clean a penny. Place the pennies on top of the paper towel. If you don't know the diameter of your marbles, measure the diameter with a ruler, and then divide by 2 to get the radius. Keep adding water one drop at a time and keep count. Now put a drop of dish soap in the water. Add detergent. Observe what happens to the pennies over a short period of time (up to 72 hours). How does pH affect pennies? pH is a measure of acidity. Coke. The state or condition in which a penny appears. 3. Add 2 teaspoons of sugar to the blue water and stir until it is dissolved. Observe any difference then take an after picture (optional) Day six the tap penny was at 6 and the salt water penny was at 7. Aug 12, 2014 · Now, as a mom of five, I make 6-figures a year working at home and share ways to help you move from penny to profit while you raise a family with sense on cents. Search for jobs related to Penny vs liquid science project or hire on the world's largest freelancing marketplace with 22m+ jobs. Dip one of the pennies into the bowl so that half of it is in the salt and vinegar solution and half is not. Put some dirty pennies in the bowl and leave them for 2 minutes. The salt and acetic acid in vinegar do the trick. To help ensure the best results Observati ons The penny in water looked mostly unchanged after 12 days. Lay the strips out side by side and determine which detergent was most effective at removing each stain. The vinegar on the second batch of remaining pennies will help them form malachite which will turn the pennies bluish-green. Jan 9, 2019 · Summary. All you need for this science experiment are vinegar, salt, a glass jar, and dirty pennies. For some quick at-home science experiments, there are a number of different methods you can use to clean your penny collection. The copper chloride helps the vinegar further break down the copper Write the name of each liquid on a strip of paper and put one strip beside the cup to mark it. Repeat steps 1–13 for the second acid. Current. We would like to show you a description here but the site won’t allow us. Place your penny on a flat, level surface that can get a little wet, such as a kitchen counter. Label the cups. What You’ll Do Guess which liquid will make a penny shine. Add 2 teaspoons of salt to the red beaker and stir until the salt is dissolved. Use the Pipet to drop one drop of water onto the center of the penny. Let the pennies sit in the soda overnight. Exact dimensions are not important. Try adding salt to the lemon juice. For each hull, convert the number of pennies it could support to grams. Place your penny on a flat surface. Vinegar has a pH level of 3. Dry off the penny and repeat steps 5-7 twice. When you pull it out, compare the halves. Analyze how each looks. The three liquids are water, rubbing alcohol, and vegetable oil; because of their different surface tensions, more water can be piled on top of a penny than Apr 25, 2017 · Soak the strips in different detergents overnight and rinse. Cut out all the coin-sized paper pieces. Mix thoroughly. Repeat steps 3 through 5 for each paper towel brand. Step 1: Pour a couple of inches of Coke or Pepsi (any dark cola will work) in the bottom of a disposable cup. The Diet Coke had a moderate grayish discoloration on the main surfaces of the penny. In this experiment the student places a dirty penny in a cup of Coca-Cola. Simulate acid rain by adding an acid to water. It can also be used to explain deeper scientific theories concerning atoms and electrons to more advanced kids. Record which sinks to the bottom and which floats on top. Jan 17, 2020 · Pennies rust overtime. Sep 21, 2019 · Here are some ideas to get you started: Measure the amount of vitamin C ( ascorbic acid) in orange juice (or another juice). Pour some of the red (salty) water into the graduated cylinder. Have a few extra for the control to compare to later. Then, take the jars outside and place them both in an equally sunny spot. See how far you can get the water to bulge over the edge of the glass without leaking down the edges. In this fun and easy science experiment for kids, we're going to turn a penny green by creating a chemical reaction with vinegar. Fill a cup with tap water and add a couple of drops of food coloring to the water. There are many materials that can be used to “close” a circuit, or allow current to flow. Afterwards, put one old coin in each cup. This experiment explores what happens when different amounts of Skittles dissolve in separate cups of water. Make This A Science Project: Try different types of juices. In a scale from one to ten based on the reactions and changes that pennies had, I gave it a score of 8 to pennies inserted in vinegar and salt and The 'Ultimate' Science Fair Project: Frisbee Aerodynamics. Washing pennies with water is a physical change. STEP 1. Fill two identical mason jars with water. Mass dry penny after the reaction. A chemistry project for 5th graders should appear more like fun and less like learning. Conclusion • My hypothesis that the cola would clean the penny the best was incorrect. In a non-metal bowl, create a solution of water and vinegar. You can use pH paper to test whether the acidity is changed after water If you run out of dry pennies, you may need to use paper towels or a rag to dry some, or wait until they have dried. Before trying to clean the pennies with salt and vinegar, have your kids try to wash them with soap and water. 5 strips of paper (for labelling each penny) Some kitchen paper or paper towels. Acid solution may be flushed down the drain with water. Making your own bubble solution is fun, but sometimes the bubbles don't seem to work as well Instructions: Put one penny in each bowl. In each bowl, place half of the pennies. Jan 31, 2020 · This two-part penny change experiment uses vinegar, a household acid, to clean copper pennies. For this chemistry project, gather a collection of dull pennies. Start a 1 minute timer. Prep Work. Pour a small amount of hot water in the middle of the plate—just enough so that the water touches the candies. ”. Cite this Article. Hot sauce, like Tabasco or taco sauce, also will remove the oxides off pennies. Wait about five minutes then remove the penny and wipe it off with a paper towel. Add 2 drops of liquid dish soap to the beaker and stir. Pennies with vinegar ready to be observed. This will make the pennies look shiny as the copper oxide is what gives the pennies a dirty and tarnished look. 1. Fill four cups each one quarter full with each of the six cleaning solutions suggested (4 with lemon juice, 4 with orange juice, 4 with cola, 4 with water, 4 with baking soda paste and 4 with dish liquid). Abstract. (Get an adult to help to make sure you don't hurt yourself). Did you know that even though water is a liquid, it isn't always able to get into little cracks and crevices? So how do clothes go from caked with mud to clean? How can dishes go from greasy to glistening? You can "clean" a penny a little bit and very slowly with lemon juice or vinegar (mild acids), but put a dash of salt in the lemon juice and the penny will turn orange with a quick rub. Uncover the hole and record how long it takes for all of the liquid to leave the cup. For my science fair experiment, I wanted to answer the question of “Which Type Of Liquid Can Clean A Coin The Best?”. The liquids i choose to use where grape soda, lemonade, water, diet coke, and sprite. Mix with a spoon. This means that lemon juice is a slightly stronger acid than vinegar. 10. Preparation. This is your control. Again, exact size is not important, but the square piece of aluminum foil should be a little bigger than a penny. 5 and the vinegar penny was at 9. Remove the pennies from the cups, using the strainer, as follows. When you put the steel nail in the mixture, some of the iron dissolves. VIDEO COMING SOON BUT YOU CAN STILL ENJOY THESE AWESOME EXPERIMENTS! How it Works: Pennies are made out of a metal May 26, 2016 · Preparation. These ions bond with the copper, forming copper chloride. Rinse and dry the thermometer probe. Take the pennies out and dry them with paper towels. Procedure for Penny Chemical Reaction. Fold the aluminum foil into a square about 1 inch (2. Add Favorite. Allow the test tube and probe to come to room temperature before doing any more trials. May 17, 2019 · Skittles Density Science Project. Record which pennies that were marked by writing down the year of each penny. Step 3: Drop a few pennies in the bottom of the cup. Carefully record each coin’s condition prior to placing it into its cup. The Swimming Secrets of Duck Feet. Trace a coin 20 times on the construction paper with a pencil. 5% Copper. Set one penny aside. (You may need to push the one in the catsup to get it fully Experiment with the pH Scale Science Projects. 5 cm) on each side. Middle School - Grades 7-9. Step 2: Using the permanent marker, mark an X on one side of several of the pennies. Directions: Gather all of your coins and lay neatly. The citric acid in lemon juice removes the oxidation which makes the penny shiny. Try putting a raisin in each of the beakers. Jun 25, 2015 · Paper and pencil or pen (optional) Preparation. Fill a glass cup with vinegar and pour it in a non-metallic bowl. Science fair projects for third-graders can center on one of the three main science disciplines: biology, chemistry or physics. Like the copper atoms, each of the iron atoms that dissolves leaves two Some pennies are bright and shiny, while others look dark and dirty. Make sure and record the number of drops it took before the bubble burst. My type of liquids consisted of Cola, Baking Soda Paste, Orange Juice, Water, Lemon Juice, and Dish Soap. Apr 12, 2022 · Why does ketchup clean pennies the best? Ketchup contains vinegar, a weak acid, which breaks down the copper oxide on the surface of the penny. Using the pipet, slowly add the blue (sugar) water one or two drops at a time. This is an experiment that a 10-year old can do virtually on his own, and is one that delivers immediate as well as long term results. Tweezers. Record the calculations in your data table. Place one of each type of coin into each solution. Round, coppery in color. 5. The lemon juice made the penny shiny with slightly discoloration along the rim. Place the pennies on the paper towel. May 20, 2024 · Best Answer. Your teacher probably doesn’t fully understand this subject. Compare all three pennies. Will putting pennies in liquids with different pH affect the pennies? Will pennies placed in a more acidic pH become cleaner, corroded, or even dissolved? In my experiment, I will find out. Hypothesize: Before you start, have a little brainstorm with your young scientists about which liquid they think will do the best job at cleaning the pennies Experiment with Liquids Science Projects. Create a graph to illustrate the results of which paper towel absorbs the most water. Rinse a new penny in tap water. The diet coke had a moderate grayish discoloration on the main surfaces of the penny. Compile different amounts of each. Create another solution with water and baking soda. Write down your hypothesis (what you think will happen to the pennies). Step 2. She leaves the cup alone for 24 hours and observes what happens to the penny, which will be completely cleaned. Through a penny cleaning science project, you can study atoms, chemical changes and observing processes through the scientific method, all of which are science lesson benchmarks for eighth grade. ) 2. Add your ingredients from heaviest to lightest. Experiment with how acid affects the environment or health. Calculate the percent of zinc in the penny. Find the dirtiest old penny you can, and call it 10% bright (Not 100 percent or 0% brightness because you might find a brighter or duller penny). This is what the pennies look like sitting at the bottom of the glass. The pennies will need a chemical reaction to make them shiny again! Apr 25, 2017 · Salt and Vinegar Experiment. Repeat this with mixtures of water and 2 ounces, 3 ounces and so on of sugar. Pour about two teaspoons of salt into the bowl with the vinegar. You can make the pennies look like new again by soaking them in water that is corrosive enough to strip off the copper oxide layer. Materials that allow electric current to flow through easily are called conductors. Feb 21, 2018 · Soak your pennies in ketchup to clean them like new. As indicated in the student instructions, each team needs three containers (beakers or cups) of liquid: one containing water, one containing rubbing alcohol, and one containing vegetable oil. Weight: 2. 5 grams. Gather all your materials at a workspace that can tolerate accidental spills of the liquids. Aug 27, 2020 · Step 1. The grape soda caused the most discoloration of all the pennies with a grayish black covering the entire penny. Otherwise you can keep a tally of your drops. Ask your child to predict how many drops he or she thinks will fit on the penny. Apr 24, 2017 · Lemon Juice vs. Before placing one penny in a solution take a before picture (optional) Let pennies sit in the solution for 10 minutes. Wait about 5 minutes after all pennies are out of their solutions and observe them again. So 1st cup will have catsup, 2nd will have coke, and so on. Throw away the steel wool and wash and dry the test tube. P =Project E =Experiment. Here we have the heaviest being corn syrup, then dish soap, then water (color the water if desired), then oil, and lastly alcohol. Well, after you wash the ketchup off, that is. Write down your observations in the table. Place a few old pennies in two of them. Apr 24, 2017 · Science Projects on Cleaning a Penny. Pour some vinegar into a bowl and add enough salt to create a saturated solution, which means that not all of the salt is able to dissolve. The process was simple – we used a plastic pipette to drop our liquids onto a penny, and we counted how many drops of each the penny held before the liquid spilled off the side of the penny. Directions. Pour some vinegar into a bowl and add enough salt to create a saturated solution, which means not all of the salt is able to dissolve. Illustrating a chemical reaction by changing the color of a penny fits the bill. Apr 25, 2017 · Dissolve 1 ounce of sugar into 1 cup of water and pour it into a metal cup with a hole in the bottom. The next day, pour the soda out of the glass, careful to leave the pennies. If you are working with a partner, they could help you keep count. Place one paper towel over one pool of water. Place your ‘Control, 1 minutes’ penny into the ‘Control 1’ cup. But, can make them shiny and new again. Stop when the water spills over the coin. Materials that do not allow electric current to flow well are insulators. You are finished when the “bubble” of water that is sitting on top of the coin bursts and runs May 8, 2024 · How To Make A Liquid Density Tower. As it is easy to see, the ingredient that had the greatest impact was vinegar with salt, and the one who had the lower impact was water. Mix it together with a plastic spoon until the salt is completely dissolved. Mark the first glass “vinegar only,” the second “during reaction” and the third “after reaction. Pour all liquids down the Apr 25, 2017 · Use three clear glasses for this experiment, half filling each with vinegar. Remove the pennies, rinse them in water, and rub them with a paper towel. Hypothesize: Before you start, have a little brainstorm with your young scientists about which liquid they think will do the best job at cleaning the pennies Steel is a metal made by combining iron, other metals, and carbon. Vinegar. The results may surprise you! Remove the raisins with a spoon. STEP 2. com Science Projects. Count the pennies as you add them to the water. The detergent’s polar ends are attracted to the water and its nonpolar ends are attracted to the oil. (20 results) Experiment with floating, carrying cargo, or moving objects across liquids by learning about the physics principles of surface tension, density (mass per volume), or viscosity (resistance to flow). 5 different liquids to use to clean your pennies. See full list on teachbesideme. A pen and paper for jotting down the results. In the other cup, pour enough liquid soap to cover the penny. An extension of this science fair project is to leave the penny in the 5 old copper pennies (these coins need to be copper for this experiment to work) 5 paper cups. Dirty pennies (the older, the better) 2 paper cups; Vinegar; Dish soap; Paper towels; Various other liquids from around the house (think ketchup, soda, etc. Other Studies. Apr 25, 2013 · The purpose of our experiment was to see which liquid has the most surface tension: water, soapy water, or vegetable oil. 950 reviews. A dropper. Kids can observe the oxidation process as the copper in the pennies reacts with oxygen in the air to form copper oxide and then malachite. How It Works. It's free to sign up and bid on jobs. The pop penny was at 8. Make-Up: 97. Add a penny to each of the three cups. For this chewing gum science project you will need to experiment with both. The vinegar discolored the rim and a little of the main surfaces of the penny slightly. The salt water penny was at 7, the pop penny was at 9. Remove the pennies, rinse them in water and rub them with a paper towel. . Nov 12, 2022 · To make your homemade battery, first tear a square piece of aluminum foil about 3 inches (8 cm) per side. Mix a quarter-cup of white vinegar and a teaspoon of salt into a clear bowl and dip a rusty penny Apr 25, 2017 · Making Pennies Shiny Again. Put the Skittles in a circle in the order of colors in a rainbow (red, orange, yellow, green, purple) on a white plate. When it comes to what liquids you and your kids can use in this Apr 6, 2020 · Vinegar may remove actual dirt from the pennies and other coins because it works well as a cleaner! Extensions: Science Bob offers a few more experiments you can try using the same materials. Moreland ran a similar experiment in 2003. 3. Hot Sauce. Leave the coins in the liquid for 10 minutes. 7. Thoroughly clean the work area and wash your hands. Ultimately, lemon juice will clean pennies better than vinegar, though both liquids are viable cleaning options for copper. On the last day of the experiment the vinegar penny was cleaner than all the others with a rating at 10. Now comes the hardest part of the experiment - the waiting. 5 × 0. Apr 30, 2018 · Drop the pennies into the soda. the pennies in the other liquids, and record your observations in the table. Keep it out of reach with a note to be sure no one drinks the soda. Observe any difference then take an after picture (optional) Make sure the rim of the glass is dry, so that water won't drip down. ) Steps to Sparkling Success. Apr 28, 2024 · PENNY EXPERIMENT SET UP: STEP 1: Prep the green pennies science experiment by filling 2 small bowls with about 1/4 cup of vinegar and a teaspoon of salt each. First, i filled 5 plastic cups with 5 different liquids. Even though the paperclip is still denser than the water, the strong attraction between the water molecules on the surface forms a type of ‘skin’ that supports the clip. Liquid name. (14 results) Investigate a chemistry-focused question where the answer will be on the pH scale. Continue slowly adding drops until the bubble of water on the penny bursts and spills over the edges. Aerodynamics & Hydrodynamics. 2. Sep 19, 2014 · Results. Open the package of Skittles. The pennies placed on the paper towel. Add 1⁄4 cup of vinegar and 1 teaspoon of salt to the third cup. Calculate the viscosity of each liquid using Equation 1 from the Introduction. 5. Do not add anything to the cup. Place your penny on a flat level surface 6. Do this by multiplying the number of pennies by 2. Most metals including aluminum are good conductors of electricity as well as water. 6. Apr 25, 2017 · Put water into a glass beaker and add oil to it; the oil, because it is lighter, will float on the top. Leaving one of the jars uncovered, cover the other one with an improvised aluminum foil lid. Everyone has seen dirty, tarnished pennies. Fill a glass, cup or small bowl with tap water Materials: Lemon Juice Dirty Pennies A cup Paper Towels Taco Sauce (optional) Instructions: Put a dirty penny in the cup and cover it with lemon juice. 25, and the tap water was at 6. wmabzjmkclsobeiuqkof
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