Procedure: Put the penny on a flat surface. Use a pipette to draw water and carefully put individual drops of water onto the penny. 2. 5. 2. ruler. Because the water molecules are polar, they grab onto one another through hydrogen bonds. Repeat steps 1-4 two more times. It has to do with something called surface tension. Directions. The hypothesis was confirmed, acid reduced the number of drops that could be added to the surface of a penny by 10.4%. Repeat this 3 times - make sure you thoroughly dry the penny between each trial. : I think a penny will hold _____ drops of water. Students will see how many drops of water each side of a penny will hold. Tails New Penny vs. Old Penny 2 - What was the control group? Place the penny on a flat surface that can get wet, such as a kitchen counter. Students conduct a simple test to determine how many drops of each of three liquidswater, rubbing alcohol, vegetable oilcan be placed on a penny before spilling over. Scientific Method Lab Sheet. How many drops will stay on the face of a penny without spilling water off the sides? 3. Each time you do it, write down the number of drops. 4. Repeat the experiment to see if there is a change in the number of the graph . Place the penny on a fresh paper towel. CHEMISTRY PENNY LAB ANSWERS ORISIM DE. 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. Note: Award less points if use more than about 5 drops. Problem Solving . Drops on a Penny Cohesion Lab by Science Lessons That Rock 13 $2.50 Zip Compatible with This is a fun lab because you can use it at so many grade levels and for so many different topics. How is the Surface Tension of Water Affected By Soap? 4. This investigation asks students to review the properties of water as they relate to life, usually a topic covered in the first or second chapter of most biology textbooks. Cover the cup with the index card and put the penny on top of the card. This download is a 3 page activity that directions students though the classic water drops on a penny lab. The front page includes pre-lab questions that challenge students to write a hypothesis & a prediction and includes the directions for each trial and charts for them to record their data. Analysis 1. Calculate the mean (average) of the three trials and enter in . Although it was initially designed for middle school use, this activity can be modified for use at any level to reinforce the steps of the scientific method. 1. For Teachers 10th - 12th. Predict: how . Graph the results of your entire group. The challenge is to get the penny into the cup without lifting the card and only touching the card with one finger. +. 2. Provide each child with a penny, an eye dropper and cup of water. Data . Repeat the steps for a total of 5 trials. These plastic pipettes work well. Furthering testing into the effects of pH . Place the penny on top of the paper towel. Fill a small glass or bowl with water. Instructions. 3. Penny Lab. Take an average of . 5. How did this compare to your prediction? For the Drops on a Penny lab experiment, testers use an eyedropper to drop single drops of water onto a penny, and they count how many drops can fit on the surface before spilling over. H A: The number of water drops a penny can hold is influenced by "side of penny". This cohesion pulls a drop of water into a spherical shape because that's the shape that allows for the maximum number of bonds. 1. Students then perform an experiment where they test the number of drops that can be placed on penny . Students are given the simple task of determining the number of drops that can fit 3. Wipe the water off of the penny. STEP 1: Add water to both of your bowls, and to one of them add green food coloring. 1. The experiment shows the difference in cohesion to a penny between a neutral and acidic solution. WATER DROPS ON PENNY LAB YAHOO ANSWERS. Observe what happens. Now, carefully add one drop of water at a time to the top of the penny. STEP 3: Count how many drops you can fit onto one penny . PART 1: Drops on a Penny Lab (complete as a group) Obtain a beaker of water with 50mL of tap water, a penny, a plastic pipette, a soap bottle, a calculator, and a . Check to make sure all of the materials needed are at your lab station. Investigation: Properties of Water (with Stats) Admin September 23, 2017. 6. Using the dropped, start placing drops of water on the penny. Place the penny on paper towel. Get the students to count the drops. Guess how many drops of water youc an fit on the front of a penny. 5. Dry the penny after every trial and keep going for 1-3 tries Data and Observations: Trials Total Drops of Water 1 17 2 18 3 17 Trials Total Drops of Water Average 17 Investigative Reflection Question: The ability of water molecules binding together aka cohesion. 3. Test your hypothesis by comparing the number of drops of tap water that can fit on a penny to the number of drops of soapy water that can fit on a penny. Class data showed that, on average, the clean penny held 10 more drops of water than the penny with soap on it. Put the penny on a flat surface (Have the penny resting on a paper towel). The purpose of the experiment is to test the cohesion and surface . Write down your prediction on a piece of paper. Step 3: Experiment & Data Collection. Place a coin on a table or desk. 3. Drop water from the dropper onto a penny, keeping careful count of each drop. Write down your guess. Organize Data Graph Data Make Predictions. 5 eyedroppers 10 data collection worksheets. Once kids feel comfortable with the eye dropper, they can add one drop of water at a time to the head of the penny. H 0: The number of water drops a penny can hold is not influenced by "side of penny". 4. Fill the second pipette with plain water from the small beaker, hold pipette vertically and drop liquid in the pipette slowly onto the penny while counting the number of drops. Repeat steps 1 -4 for a total of 5 trials. 6. The penny should be head-side up. Students will identify and label parts of the scientific method on which type of water will hold more drops on a penny: soapy or plain. The procedure for this experiment is simple. Procedural Knowledge. This indicates that there is a relationship between surface tension and an added substance on a surface. 9. The dependent variable in this experiment was the number of drops on a penny. Materials: Penny, Eyedropper, Water. Record the number of drops for that trial in the table. 5. B. GRAPH THE DATA Create a Stem-and-Leaf plot of the class data. Using a dropper slowly drop water onto a penny counting each drop. Start with defining the question: How many drops of water can a coin hold? The mutual attraction of water molecules is called cohesion. Record your data in the table below. Using a pipette, slowly drop individual droplets of water onto the surface of the penny. Have them count each drop, this is their data . This tight arrangement at the surface is called surface tension. Before the experiment gets underway, you may need to demonstrate how to use an eye dropper-- this is a complicated fine motor skill for some kids. by. 2. Extensions Perform this as a student activity, rather than just a demo. Because of their different surface tensions, more water can be piled on top of a penny than either of the other two liquids. OR . We tried this several times, and we were able to get . Data Collection Graphing Line of Best Fit Interpret Data. 4. Size of drops Soap vs. No Soap Heads vs. Record the number of drops of water the surface of the penny can hold in the table on the next page under the column labeled "Run 1." 5. Use an eyedropper to place drops of WATER on the penny (one at a time) until ANY amount of water runs over the edge of the penny. If you are worried about getting water on the table or the floor, you can place a paper towel underneath the penny. Each team member may work simultaneously as long as each person stays focused on the activity. In this activity, you'll experience surface tension and cohesion by testing how many drops of water you can you fit on a penny. In this percent composition worksheet, learners carry out an experiment to determine the percent of zinc in a penny. Also, the Drops on a Penny Lab provide the students an opportunity to practice the methods of "doing" science. 2. 3. This shows inconsistent technique in creating the drops. 4. 3. Name: Nicole Davis September 10, 2012 Room: SCCH Level: 2/3 and 4/5 . Fill a glass, cup, or small bowl with tap water. Surface tension is what makes water dome on the penny. Count each drop until the water begins to spill over the sides of the penny. 3. 3. 2. How many drops can fit onto the penny before the water spills off? Another student-centered activity which has been included is the Penny Lab. Place the paper towel on a flat surface. Topics include: the scientific method, independent and dependent variables, constants, and observations. Take a Guess: How many drops of water can fit on one side of a penny? Record this number in the data table. The number of water drops that can fit on a penny will surprise you. Steps. 2. 6. This is an optional step if you want to see the drops a bit better. Summary. Put the penny on it. (The dry paper underneath will get wet.) Draw a diagram like the one below, showing the shape of the water on the penny after one drop, when the penny is about half full, and just before it overflows. Share with the group. Discussion Questions: 1 - What variables were involved? 4. Gather remaining materials and take to lab station. Count the number of drops until the water spills over the edge of the penny. Add a drop of soap/detergent to the water you use. Using a dropper bottle containing only water, count the number of drops of water that you can balance on top of a penny. Repeat the experiment, say, three times. We like having them on hand for all kinds of activities. Save paper by going digital or print: the choice is yours! But we might be able to say that with a mechanical pipette that dispenses 1 cubic milliliter of water per drop, held 5 cm above the penny, at 7000 ft. elevation, on this day of the year at this time of day, in Flagstaff, Arizona, with distilled water and a 2010 penny, head side up, that the penny can hold an average of 27 drops, plus or minus 3 . Instruction for Penny Drop Experiment: 1. middleschoolscience.com) In this portion of the lab you will determine which liquid has the highest surface tension: water, soapy water, or rubbing alcohol. The independent variable is the portion of the experiment that is changed between tests. Conceptual Understanding. Rinse a penny in tap water and dry completely. Surface tension can be measured and observed by dropping water (drop by drop) onto a penny. Count how many drops it will actually hold. 1. The Penny Experiment with Water Drops Simple Science for from artfulparent.com (the dry paper underneath will get wet.) Place your penny on a flat, level surface that can get a little wet, like a kitchen counter. With a dropper, penny and cup of water, count how many drops of water can fit on the penny. Remember to aim for even drops, close to the penny but don't let the dropper tip touch the penny. Find the average number of drops of water you can fit on the penny. 7. Place penny onto a paper towel on a vertical, solid surface. 2. Graph the results of your entire group. 2. Count the number of drops until the water spills over the edge of the penny. Carefully . The purpose of our experiment was to see which liquid has the most surface tension: water, soapy water, or vegetable oil. You might be surprised considering pennies are so small! Do #'s 1, 2, 3 now! Fill the medicine dropper with water. PENNIES PRE LAB LOUDOUN COUNTY PUBLIC SCHOOLS. Fill empty 100-mL beaker with 30-mL water. Use this data to create a box and whiskers plot. Record your data. 6. 3. Even preschoolers can grasp the basics of following the scientific method, and it can be applied to this simple experiment. 1. Record these numbers in the data table. Penny, Nickel, Dime Water Drops. Step 1: Rinse a penny in tap water and dry completely. Holding the eyedropper close to the surface of the coin, carefully squeeze water droplets onto the coin, one at a time. Drop single drops of water onto the coin. Record your data. STEP 2: Use an eyedropper or pipette to pick up and carefully drip one drop of water at a time onto the penny. Jeffrey DeBlase. What You Do. MA.6.S.6.1 MA.7.S.6.2 MA.912.S.3.1. Squeeze the bulb of the pipette so that one drop lands on the penny. Drops on a Penny: Teacher Notes. 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. Dry thoroughly with a paper towel. Repeat Steps 1 - 4 three more times before calculating your average. Use a dropper to place as many drops of water on the penny (ONE AT A TIME) until ANY amount of water runs over the edge of the penny. Try it. This will come at the front of the lab, but should be the last thing written. Draw water into the eyedropper by squeezing the bulb at the top, then placing the tip into your container of water and releasing it. 3. 1. Place the penny on paper towel. penny could hold. Subjects: As a result of this activity, students will learn to model and graph stem-and-leaf plots and box and . Introduction/Statement of Problem: (Science Journal Pre-lab + Final Lab Report) Fill the pipette with water. _____ Part A: Perform a CONTROL test for comparison with later results. Ask your child to predict how many drops he or she thinks will fit on the penny. Scientific Method - Preschool Style. Elevation, on this day of the year at this time 3. After you have succeeded with one penny, try it with multiple pennies and other coins. Use the eye dropper to drop water on the penny, one drop at a time. Use a dropper/pipette to drop water onto a penny. Guess how many drops of water a Heads-Up penny will hold. Repeat steps 1-4 for 3 more trials. 2. Drop a drop on the penny 6. The droplets should pool up on the coin, creating a big droplet of water. Because water drops may vary depending on how well you drop the water, it is best to run many trials and take an average. Repeat Steps 1 - 4 three more times before calculating your average. In order to do this, you will determine the number of droplets that can fit onto a penny without spilling over for each liquid. 10 paper/plastic bags paper towels . Stop squeezing when the droplet on the coin breaks up and overflows. Carefully count the drops as you go. The classic water drops on a penny lab has never been more clear, cut and dry than this! #3. During the Penny Lab, we were required to count the maximum number of drops of water each side of a . How many drops of water were you able to drop onto the penny before the water spilled? Count the drops of water. The alternate hypothesis is that the side of the penny does make a difference. Counting Drops on a Penny 1. Multiple people in groups completed the drops, which could have affected the number of drops that stayed on the pennies. 6. Drops on a Penny Lab - Students conduct tests to see how many drops of water can fit onto a penny. This is why water forms a round drop or dome at the top of the filled test tube and on the surface of a penny. Drops on a Coin Record Chart. C. ANALYZE THE DATA 1. It reduces the surface tension causing a dramatic reduction in the number of drops that will fit on the coin. 2. A single drop of alcohol on a penny. On the lab table, place the penny heads up on a paper towel. We placed a dry penny on a piece of damp sponge and used a pipette to drop water . Use an eyedropper to place drops of WATER on the penny (one at a time) until ANY amount of water runs over the edge of the penny. 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 . Hold the pipette just above the coin. 5 cups 10 observation worksheets. Drops On A Penny Lab Worksheet. Hold your dropper about inch above the penny at a steep angle and slowly add drops of water to the surface of the penny until it overflows--count this as any time the water goes off of the edge. Now, let's see how many drops of water you can you place on the surface of a penny before it overflows. Part 1: Guess how many water drops you can fit on the front of a penny. 2. Step 3: Use an eye dropper to place drops of WATER on the penny (one at a time) until ANY amount of water Place the penny on paper towel. This worksheet is a great introduction on "doing" science. The water had a pH level of 7 and the .25 molar sulfuric acid had a pH level of 2. Pour some water in a small container. In the space to the right, draw what the penny looked like as viewed from the side before the water overflowed. _____ b. 4. HALF LIFE OF A PENNY LAB ACTIVITY KENT CITY SCHOOL DISTRICT How Many Drops Lesson TeachEngineering May 9th, 2018 - This lab exercise exposes Wet Pennies Students conduct a simple test to determine how many drops of The . Name _____ Date _____ Problem/Question: "How many drops of water . Step 2: Place the penny on paper towel. 2. 5. 3 - What were the independent and dependent variables? The inward pull from the attractions of the molecules results in the smallest possible surface for a volume of water, which is a sphere. Then, encourage your preschoolers to make a guess, or hypothesis, as to the . Record the number of drops for that trial on the table below: 5. Scientific Method: Water Drops on a Penny Abstract (Extra Credit): (Final Lab Report) The abstract is a short paragraph summarizing purpose, problem examined, results, and outcomes of the lab. Record the number of drops for that trial in the table. For example, my null hypothesis is that the side of the penny makes no difference. 3. 4 - Were your results . This will come at the front of the lab, but should be the last thing written. As a result of . Have a friend count the number of drops as you do the . Record your data. Drops on a Penny Lab. Make a prediction about how many drops of water you can put on the penny before it overflows. There's only one way to find out Objectives: Describe the cohesive and adhesive properties of water. Describe a successful technique. Wipe the penny dry of water. Hold the medicine dropper just above the top of the penny (not touching it), so . 4) Detergent solution: Successfully get approximately half as many drops on a penny as compared to water (20 to 30 drops expected) 25 pts_____ Note: Award less points if use significantly fewer than 20 drops Introduction/Statement of Problem: (Science Journal Pre-lab + Final Lab Report) Set the penny on a level surface. Complete the following activity for Part 1, and then use a biology textbook to answer the following questions about the importance of water to living . Scientific Method: Water Drops on a Penny Abstract (Extra Credit): (Final Lab Report) The abstract is a short paragraph summarizing purpose, problem examined, results, and outcomes of the lab. 4. Science Behind the Experiment: The many tiny molecules in water are all attracted to each other and is Place your penny on a flat surface. The number of drops will probably come out about the same each time. 4. Use the data to calculate the mean, median, mode and range. 4. They write a balanced equation for the chemical reaction they performed with the penny and hydrochloric acid. 10 coins (different) water . Part 1 - Drops of Water on a Penny (Adapted from www. Try it. 6. Half-fill a cup with water 4. 2. Rinse a penny in tap water and dry completely. Rinse a penny in tap water. However, the main point of the activity is for students to come up with an explanation for their . Record how many drops the penny could hold 7. Introduction: Surface tension refers to water's ability to "stick to itself". 2. When the water falls off of the penny, record the number of drops. 3. Lab Activity! 8. It's just amazing to watch the drops of water pile up on the penny! PENNY EXPERIMENT SET UP. a. Cohesive forces are strong, but not unbreakable. the coin so that the drop has to fall a short distance before fusing with the droplet on the coin. Cut a piece of paper towel into a 2 inch square. Examine the penny and consider how many water drops you think will fit on the penny.