View lab report drops on a penny lab from science 20170290 at aquinas high school, bronx. Observe penny then place on paper towel on flat surface. I begin the lesson today by having students take out their science notebooks and title the page experiment. Prompt students to record the number of drops the penny held before any amount of water overflowed. We have 1 images for free download in hd resolution by clicking the button below. Place a paper towel on your table and set the four coins on top of the towel. Michelle lundy making it as a middle school teacher 2012 1 scientific method coin lab how many drops of water can a coin hold. Which part of a detergent molecule allows it to dissolve in water. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Final lab report the abstract is a short paragraph summarizing purpose, problem examined, results, and outcomes of the lab. I have also included information and worksheets for a demo i use to introduce the concepts of cohesion and surface tension prior to having my students complete the penny lab.
I used the same penny and dropper through the experiment. Melanie munoz e period chemistry r march 7,2016 how many drops can you pile on a penny. Drops of water on a penny experiment how many drops can. In the drops on a penny experiment, though, youll experience surface tension and cohesion at their finest. However, be careful if you have a glass eye dropper.
How many drops of water can the surface of a penny hold before the water spills over the side. Measure surface tension with a penny scientific american. You will make a hypothesis and perform an experiment to see how many drops of water can fit on a penny. Its a great formative assessment to see how much they know about controlled experiments. Purpose to show how changes in procedures can cause changes in results.
Drops on a penny quse what you just observed to predict the following. The zinc which was already silver coated the penny. Surface tension can be measured and observed by dropping water drop by drop onto a penny. This activity works well as an openended, inquirybased activity.
Do not tell students before the lab what to expect. You will then get results and make conclusions based on the results. The number of water drops that can fit on a penny will surprise you. Count the number of drops until the water spills over the edge of. This unequal sharing of electrons causes a positive charge at the hydrogen atoms and a negative charge at the oxygen atom. 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. Lab the purpose of this lab is to see the steps of the scientific method in action. May 05, 2015 welcome to science at home episode seven, season three. Wash and dry the penny, set it down on paper towel, use a dropper to drop water on it, count how many drops land on it. Put water, vegetable oil, and milk in different cups 2.
Use an eye dropper to place drops of water on the penny one at a time until any amount of water runs over the edge of the penny. Answer all of the questionsdo all the computations requested in italics. In this episode we compare the surface tension of multiple liquids by dripping drops of. Make sure that the dropper does not come in contact with the water on the penny.
Coin and water experiment drops of water on a penny. The independent variable in this experiment was the side of the penny. Theres only one way to find out by adding one drop at a time. What is the independent variable for the penny lab answers. Investigating questions how many drops of water fit on your penny. Does it matter what type of coin you use or which side of the coin you use.
Sep 08, 2007 hi, my teacher made us do the penny lab and we had to write an inquiring question. The objective of this lab is to test the effects of chemicals on the surface tension of water. Water drops on a penny introduction science process. Successfully get the least number of drops on a penny. Slowly drop water on penny, one drop at a time, until water falls off of the penny 5. What is the independent variable for the penny lab. What is the independent variable for the drops on a penny lab. This lab is designed as a follow up to the penny lab day 1.
The three liquids are water, rubbing alcohol, and vegetable oil. Created by labsci at stanford 3 part 1 drops of water on a penny adapted from. Drops on a penny lab answer key is important information accompanied by photo and hd pictures sourced from all websites in the world. Michelle lundy making it as a middle school teacher 2012 4 lab sheet answer the questions from. Made for parents and teachers drops on a penny surface tension give water some amazing properties, use them to see how many drops of water fit on a penny. Student sheet 62 national science teachers association. We will observe and study this property by determining how many drops of water will fit on a penny. You should write your answers into a word processing program and save the file. Answers is the place to go to get the answers you need and to ask the questions you want.
Penny lab the effect nacl has on the number of drops that. We placed a dry penny on a piece of damp sponge and used a pipette to drop water on the heads side of the penny until the water spilled over. You can also give the students a chance to try this demo again after they have completed the penny lab. A procedure is a set of rules or directions for an experiment.
View lab report penny lab from ap bio 101 at valley central high school. Establish your control with materials available to you at home. You might think that you cant fit many drops of water on the surface of a penny. Water drops on a penny introduction science process experiment 2 levels of a worksheet are included. How does soap affect how many drops of water a penny can hold. What is the control and independent and dependent variable in the how many drops of h2o can fit on a penny. Apply the scientific method as you work through this lab. What is the independent variable for the drops on a penny. The hydrogen atom of one water molecule attracts the oxygen of. Why do results vary even when you try to keep everything the same.
Instead of making hollow pennies, copper foils with penny imprints are the result. During the lab, students investigate cohesion as they try to fit as many drops of water as possible on one side of a penny. Surface tension refers to waters ability to stick to itself. Find out for yourself, defy gravity, and show your students some magic by performing the coin and water experiment. As a water drop builds up and out, usually bulging over the sides of the penny, the cohesive forces will eventually be overcome by the force of gravity on the water. What was the problem spongebob wanted to investigate.
The effect nacl has on the number of drops that can fit on a penny helene fitzgibbons anna derevensky aine daily emilee. In this portion of the lab you will determine which liquid has the highest surface tension. Drop water on the heads side of the penny and count the number of drops. 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. It explores the variables manipulated that can have an effect on how many drops of water will fit on a penny. This scientific method lab experiment has students answering the question. What should i write in my conclusion i really need help. The dependent variable in this experiment was the number of drops on a penny. Welcome to science at home episode seven, season three. Surface tension is what makes water dome on the penny. Materials 2 different coins paper towel eyedropper water lab sheet. Penny lab scientific method examples flashcards quizlet.
Listen to students discussion contributions and answers to gauge their level of comprehension. Instruct students to place the penny tails up and hold the eyedropper one inch above the surface. As drops of water are added onto a penny, the adhesive force between the water and the penny keeps the water from falling off. Were your trials close in the numbers of drops to one another for each of the tests, or was there a big difference. In this physics lab, we will be exploring a property of water known as surface tension. Does the heads or tails side of a quarter hold more drops of water. This trivial matter will be used to illustrate the steps in the scientific method, and to show that even little things are not so simple as they might initially seem. If we drop water on a penny, 7 drops will fit before spilling over. This is the one youre changing in the experiment, so its the type of solution that youre dropping on the penny. Record the number of drops for that trial in the table. I have my notebook displayed on the overhead with the title written already for students to refer to as a reference. Start studying penny lab scientific method examples. Use the eye dropper to drop water on the penny, one drop at a time. Drops on a penny lab worksheet penny lab pdf the download includes a lab worksheet and teacher notes.
Award less points if use significantly fewer than 20 drops and stop the investigation. Add one or two drops of soap to the cup of water and see how this affects the number of paperclips it will hold. During the lab, the measurements number of drops on a penny before spilling may be affected by the cleanliness of the penny. How many drops of water can fit on a penny without spilling over. This lab incorporates the topics of cohesion and surface tension into the lab and post lab questions. This will come at the front of the lab, but should be the last thing written. What is the control and independent and dependent variable in. Drops on a penny lab please answer so in biology last week, we did a penny lab. Repeat steps 14 four more times, and then calculate the mean average. So one time you might have a few extra drops and the next time you might have more drops. What is the control and independent and dependent variable. Older grades will be able to do the 1st and 2nd pages or do the 1st and 4th and 5th pages. It is an orderly list of steps that must be conducted. Adding soap lowers the waters surface tension so the drop becomes.
What is so creative about this experiment is you will vary each time you attempt this science experiment. Predict whether a detergent molecule will increase or decrease. In this episode we compare the surface tension of multiple liquids by dripping drops of a liquid on a pennies surface. This shows inconsistent technique in creating the drops.
Drops on a penny lab answer key drops on a penny lab answer key. Why should an experiment be repeatable by an independent investigator. The independent variable for the drops on a penny lab experiment is the type of solution used for the experiment. Followup discussion of the water drops on a penny lab. 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. Theres only one way to find out by adding one drop. Aug 28, 2011 so in biology last week, we did a penny lab. So i had to do a lab this week where we had to see how much distilled water,deterhent solution, sodium carbonate solution, and sodium chloride solution would fit on the surface of a penny. Hi, my teacher made us do the penny lab and we had to write an inquiring question. Count the total number of drops that the penny can hold. The purpose of the experiment is to test the cohesion and surface tension properties of the penny and solution. We added an extra dimension to this classic lightningfast science experiment by comparing how many drops of. In these page, we also have variety of images available.
As outlined in the wet pennies handout, lead a class discussion so students can share and compare results and conclusions. Have you ever wondered how many drops of water can fit on a penny. The reason is the water molecules will be different each time. Questions not in italics do not need to be answered. You can write down the number of drops you add if you like. How many drops of water can you put onto a penny before the water spills over the side. During the penny lab, we were required to count the maximum number of drops of water each side of a penny could hold. The independent variable is the portion of the experiment that is changed between tests.
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