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Penny Lab Answer Key: A Comprehensive Guide to Understanding Your Results
Are you staring at your penny lab results, feeling utterly perplexed? Did the chemical reactions leave you scratching your head? You're not alone! Many students find the penny lab experiment challenging, especially when it comes to interpreting the data and understanding the underlying science. This comprehensive guide provides a detailed penny lab answer key, clarifying the processes involved, offering potential results, and helping you master this classic chemistry experiment. We’ll break down the different variations of the penny lab, explaining the science behind the changes you observe and providing tips for analyzing your findings effectively.
Understanding the Penny Lab Experiment
The "penny lab" isn't a single, standardized experiment; it encompasses a variety of activities that investigate chemical reactions and the properties of metals, particularly copper. The most common versions involve cleaning tarnished pennies and observing changes in their appearance through chemical treatments. These treatments often use vinegar (acetic acid), salt (sodium chloride), and other household chemicals to create reactions that alter the copper's surface.
Common Penny Lab Variations & Their Expected Outcomes
The specific steps and outcomes of your penny lab will depend on the exact procedure followed. However, some common variations and their expected results are listed below:
#### 1. Cleaning Tarnished Pennies
This involves cleaning pennies with various solutions. The goal is to remove the layer of copper oxide (tarnish) revealing the shiny copper underneath. Common cleaning agents include vinegar, lemon juice, or even a simple scrub with soap and water.
Expected Outcome: Shiny, copper-colored pennies. The tarnish will be removed, restoring the original appearance of the copper.
#### 2. The Vinegar and Salt Reaction
This is perhaps the most common penny lab variation. Soaking pennies in a solution of vinegar and salt initiates a redox reaction. The salt provides chloride ions, which help break down the protective oxide layer on the copper. The vinegar (acetic acid) contributes to the reaction and helps remove the copper oxide layer.
Expected Outcome: The pennies will initially appear darker, then gradually turn a reddish-brown or even slightly brassy color. This is due to the formation of copper(II) acetate. The surface will likely be more textured than the original penny.
#### 3. The Pennies & Baking Soda Experiment
Combining baking soda (sodium bicarbonate) with vinegar creates a fizzing reaction as carbon dioxide gas is released. While this doesn’t directly change the penny’s composition in the same way as the vinegar and salt method, it can help clean them and reveal the underlying copper.
Expected Outcome: A cleaner penny, although the color change might be less dramatic than with vinegar and salt. The reaction's primary purpose is the fizzing and release of carbon dioxide.
Interpreting Your Results: A Step-by-Step Guide
Regardless of the specific procedure, analyzing your penny lab results involves a few key steps:
1. Detailed Observations: Record all observations meticulously. Note color changes, texture changes, the amount of time each reaction takes, and any unusual occurrences.
2. Photography: Before and after photos are invaluable for documenting changes. They provide visual evidence to support your conclusions.
3. Data Analysis: Quantify your observations whenever possible. For example, measure the changes in mass (though this is often negligible in the penny lab) or compare the brightness of the pennies using a colorimeter (if available).
4. Chemical Equations: Try to write balanced chemical equations to represent the chemical reactions occurring in your experiment. This strengthens your understanding of the underlying chemistry.
5. Conclusion: Based on your observations and analysis, draw a conclusion about what happened in the experiment. Did the reactions align with your expectations? If not, why?
Common Pitfalls and Troubleshooting Tips
Sometimes, things don't go exactly as planned in the lab. Here are some common issues and how to troubleshoot them:
Insufficient Reaction: Ensure you are using sufficient amounts of the chemicals and allow enough reaction time. Stirring the solution gently can also improve the reaction rate.
Unexpected Results: Consult with your teacher or refer to reputable online resources to interpret unexpected results. There might be environmental factors or variations in your procedure that influenced the outcome.
Safety Precautions: Always wear appropriate safety glasses and gloves when handling chemicals. Conduct the experiment in a well-ventilated area.
Conclusion
Understanding the penny lab and its variations requires careful observation, meticulous record-keeping, and a solid grasp of basic chemical principles. By carefully following the steps outlined above, you can successfully conduct the experiment and interpret your results confidently. This detailed answer key serves as a valuable resource for students of all levels, helping them gain a deeper understanding of chemical reactions and the properties of metals.
Frequently Asked Questions (FAQs)
1. Why do pennies change color in the vinegar and salt solution? The change in color is due to a redox reaction where copper is oxidized (loses electrons) and forms copper(II) acetate, a compound with a different color than pure copper.
2. Can I use different types of vinegar? While white vinegar is commonly used, other types of vinegar might work, though the reaction rate may vary. The acetic acid concentration is the key factor.
3. Is the penny lab safe for kids? Yes, with proper adult supervision and the use of safety goggles. Always handle chemicals with care.
4. What other experiments can I do with pennies? You could explore the effect of different acids or bases on the pennies, or investigate the electrochemical properties of copper using a multimeter.
5. Where can I find more information on redox reactions? Numerous online resources and chemistry textbooks offer detailed explanations of redox reactions. Search for "redox reactions" and "oxidation-reduction reactions" to find relevant material.
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| penny lab answer key: March Monthly Collection, Grade 5 , 2018-02-13 The March Monthly Collection for fifth grade is aligned to current state standards and saves valuable prep time for centers and independent work. The included March calendar is filled with notable events and holidays, and the included blank calendar is editable, allowing the teacher to customize it for their classroom. Student resource pages are available in color and black and white. Additional collection resources include: •Reading comprehension •Differentiated reading •Paired passages •Grammar •Math word problems •Seasonal resources •STEM The March Monthly Collection for fifth grade can be used in or out of the classroom to fit the teachers’ needs and help students stay engaged. Each Monthly Collection is designed to save teachers time, with grade-appropriate resources and activities that can be used alongside classroom learning, as independent practice, center activities, or homework. Each one includes ELA, Math, and Science resources in a monthly theme, engaging students with timely and interesting content. All Monthly Collections include color and black and white student pages, an answer key, and editable calendars for teachers to customize. |
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| penny lab answer key: The Jericho Flower Stephen F. Wilcox, 2002-01-31 Returning for his fourth misadventure, small-town newspaperman and social gadfly Elias Hackshaw finds himself immersed in a mystery involving a dead con man and a missing gypsy princess with the improbable name of Bimbo Wanka. Through no fault of his own—well, almost none—Hack becomes a suspect in the case when the cops mistakenly conclude that he was an acquaintance of the murdered con artist. Meanwhile, Bimbo's parents turn up on Hack's doorstep demanding he turn over their missing daughter, or face a gypsy curse. To add to the mayhem, a local industrialist is badgering Hackshaw to oversee a major renovation to his monstrosity of a house, and Hack's sister Ruth is hectoring him to forget everything else and see to his duties as editor of The Triton Advertiser. Trapped by circumstance, Hack begins poking into things and soon discovers a circus assortment of off-beat characters: gypsies in cowboy hats, a con man with a conscience, a sheriff's investigator without a heart—or a brain—ham-fisted townies, and much, much more. Only a strong survival instinct, and his usual portion of dumb luck, can save Hackshaw this time around. “Wilcox spins an entertaining yarn of murder and mayhem…With a credible plot and eccentric characters that adroitly avoid being mere caricatures, Wilcox offers a semi-cozy mystery—uncloying, clever and far from brutal.”—Publishers Weekly “Wilcox is an absolutely first-rate writer…The Jericho Flower is a well-crafted, imaginative tale that this reader wished could go on for much longer. It's a great read…”—Midwest Book Review “The Jericho Flower is a surprising, deep, amusing, and character driven mystery that will keep you on your toes…It's a mystery that keeps you hanging until the very end, an unlikely hero who will keep you laughing, and a full range of characters that opens you up to small town life…a most involved and amusing mystery from this very talented author.”—All About Murder |
| penny lab answer key: Missing Pieces L. E. Drummond, 2002-10 When troubled Private Investigator Kat McCarthy stumbles upon the body of her client, she unwillingly finds herself in a race against police to absolve the victim's husband. Her pursuit is complicated by the charming Daniel Stratton, a police investigator who may prove to be more than a simple adversary. |
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| penny lab answer key: From Promise to Practice Nancy Kober, 1998-02 Presents an overview of the U.S. Dept. of Education Regional Educational Laboratories (REL) in an attempt to make the capabilities, expertise, and acquired knowledge of these RELs more widely available to the teachers, administrators, parents, policymakers, and community members committed to ensuring that all children can learn to the fullest of their potential. Discusses the RELs from the point of view of school reform and improvement; professional growth of teachers and administrators; school, home, and community relationships; and decision-making by policymakers. Lists the RELs with maps and complete information. |
| penny lab answer key: 74 Miles Away J.D. Carpenter, 2007-01-20 Long-listed for the 2009 ReLit Award Because business is slow for retired homicide detective Campbell Young’s new enterprise, A-1 Investigative Consultants, he decides to take a break a horse-playing vacation to Florida. No sooner are his plans made, however, than his old friend Priam Harvey approaches him with a complex problem: a young Caribbean jazz musician has been found dead in a Toronto hotel room, his body surrounded by the paraphernalia of voodoo. Harvey, whose connection to the victim is revealed to be more than casual, persuades Young to put aside his Racing Form and pick up the trail of the killer. Young’s pursuit takes him all the way from the nightclubs of New York to the Pine Barrens of New Jersey and the backwater bars of Grand Bahama Island before the possibility presents itself that the murderer might actually be right in his own backyard. This is book #3 of the Campbell Young Mystery series. Book #2 is Bright’s Kill (Dundurn, 2005), and book #1 is The Devil in Me (McClelland & Stewart, 2001) |
| penny lab answer key: Jewelry & Gems—The Buying Guide (7th Edition) Antoinette Matlins, Antonio C. Bonanno, 2012-11-07 Over 400,000 Copies in Print Know What You Want, Know What You’re Buying, Learn the Secrets to Get the Most for Your Money Easy to Read Easy to Understand Practical Complete Instant Answers ... to All Your Questions Completely Updated & Expanded 7th Edition! Purchasing gems and jewelry can be a magical experience, filled with excitement and anticipation. But lack of information, error, or misrepresentation can make the thrill of buying a gem or piece of jewelry confusing, intimidating, overwhelming, and costly. To help you avoid the pitfalls and keep the magic, two internationally respected experts on buying gems and jewelry put their inside knowledge to work for you in this easy-to-read, easy-to-use guide. It is filled with practical advice and is designed to make it easy for you to have all the information you need to buy gems and jewelry with confidence. Recommended by consumer and jewelry trade reviewers around the world, it is already in use in over 100 countries and has been translated into Spanish, Arabic, Greek, Hungarian, Russian and Japanese. Over 400,000 copies are now in print and this revised, updated, expanded edition covers even more: buying and selling on the internet, dazzling new diamond cuts, recently discovered gems ... and new treatments and trickery to look out for. There are fascinating mythical and magical tidbits, and practical tips that could only come from an insider. In simple, straightforward terms you’ll learn about the four Cs and how to juggle them to get what you want, at the price you want to pay; what to look for, and look out for; all about gold and platinum, jewelry design, and some of the country’s leading designers. You’ll learn what questions to ask and what to get in writing, and even how to select the jeweler, appraiser, and insurer. The authors leave no stone unturned to give you everything you need to know—whether you are a novice or a connoisseur. With Jewelry & Gems: The Buying Guide, you’ll find the experience can be a joy, and the gems and jewelry you select a source of lasting pleasure! |
| penny lab answer key: Meant to Be Mine Lisa Marie Perry, 2016-08-30 Delicious and sensual, heartbreaking and heartwarming, Meant to Be Mine is no guilty pleasure. It's just all pleasure. Burke and Sofia have off-the-charts chemistry. I can't wait to read the whole series. --Tiffany Reisz, international bestselling author of the Original Sinners series on Meant to be Mine Loving him was hard. Wanting him was so damn easy . . . Sofia Mercer may have been sick as a teen, but she's no delicate flower. And she's proven it by making it on her own and starting a new life away from the town that turned against her, away from the boy who broke her already fragile heart. But when her aunt Luz dies unexpectedly, leaving Sofia with a mountain of regrets and the keys to a quirky boutique, Sofia has no choice but to return to Cape Cod. Only, this new life in her old town comes with complications. Burke Wolf was Sofia's first love-a relationship that burned bright and went up in flames. Seeing him again, Sofia can't help but get caught up in that all-too-familiar tornado of passion and pain. He's battled his own demons-that much is clear. But Sofia can't afford to be careless with her heart . . . and loving Burke again might just break it completely. |
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You can also paste any graphs you would like to use to answer your questions into your Word document to hand in to me. Readings Dalrymple, G.B., 1991, The Age of the Earth, Stanford, …
Chemical Reactions of Copper and Percent Yield
Chemical Reactions of Copper and Percent Yield KEY Pre-lab (Review Questions) 1. Give an example, other than the ones listed in this experiment, of redox and metathesis reactions. …
Radiometric Dating Lab - Rutgers University
4 points- answer connects back to radiometric dating and gives at least one clear reason why information from a non-Earth source would help describe Earth events 3 points- answer …
Mineral ID Lab - Teacher Information - Science Spot
Mineral ID Lab - Teacher Information Objective: Complete the tasks/tests at six different stations and make observations to identify ... NOTE: See the answer key included with the lesson's …
Answer Key for Chromatography Lab - Mrs. Davidson's …
Honors Biology: Chromatography Lab Answer Key Terms and Definitions (1 Point Each): 1. Chromatogram 2. Mobile Phase 3. Stationary Phase 4. Solute 5. Solvent 6. Heterogeneous …
Properties of Water Lab - New Paltz Middle School
STATION 1: PENNY 1. Place a penny flat on the table near the edge of your lab station. 2. Hypothesize – how many drops of water do you think the penny could hold before water spills …
Penny Density Lab Required sections: Data
Penny Density Lab Required sections: Header Title Purpose Procedure Data Graph Calculations Questions ... After 1983, the US Mint changed the composition of the penny to be 97.6 percent …
Penny Lab Answer Key
Penny Lab Answer Key Decoding the Penny Lab: A Comprehensive Guide to Understanding Experimental Results and Mastering Scientific Inquiry This ebook delves into the intricacies of …
“Polygenics Penny Lab” - Grosse Pointe Public Schools
“Polygenics Penny Lab” Experimental Questions: Why do some traits appear in nearly endless varieties? Introduction: Polygenic traits are traits that are controlled by more than one gene, …
Penny Lab Answer Key - sequoia.comentum.com
Oct 26, 2024 · 2 Penny Lab Answer Key 2021-09-08 downloading Penny Lab Answer Key in our following section. Science Experiments, Grades 5 - 12 iUniverse On the verge of losing her …
A Penny Saved Student Worksheet Answer Key
A Penny Saved Student Worksheet Answer Key ! Directions: Read the comic “A Penny Saved” and answer the following questions: 1. Name at least five things people may sacrifice because …
Surface Tension and Cohesion Pre-AP Activity - Fort Bend ISD
Answer Key Experiment results: Students should be able to put about 40 drops of water, 24 drops of rubbing alcohol, and 14 drops of detergent solution on the penny before they spill over. 1. …
Properties of Water Station Lab: Station 1 SB1.d. Explain the …
Drop water from the dropper onto the penny, keeping a careful count of each drop. 2. How many total drops did you get on the penny? 3. Explain your results in terms of cohesion and polarity. …
GS104 Lab 8 Answer Key - Geological Time - Resources
GS104 Lab 8 Answer Key - Geological Time Pre-Lab Questions 1. stratigraphy - study of spatial and temporal relationships between layers of sedimentary rock. Involves placing rock layers in …
Penny Drop Lab - The Palm Beach Momma
HYPOTHESIS: If I drop one drop of water at a time on a penny, then I could get _____ drops on before the water ran off the sides. CONDUCT AN EXPERIMENT: Materials: 1 penny, I paper …
Take a Guess - moodle.oakland.k12.mi.us
NOTE: You can also give the students a chance to try this demo again after they have completed the penny lab. ... on the lab worksheet. Part C Answer Key - 1. Explain your results from both …
Chemistry: Isotopes
Refer back to your pennium data and answer the following questions. 1. What do the pennies represent in this investigation? 2. What do the different masses of the pennies represent? 3. …
INVESTIGATIVE STUDY: HALF-LIFE OF PENNIES - Weebly
PRE-LAB: To be completed before class starts. Read the “Introduction” and “Procedure” sections and respond to the following: 1. True or False: It is impossible to predict which atom is the next …
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practice exercises and lab reports, take quizzes and exams, and conduct hands-on experiments as they see God’s hand in every aspect of their study. Approximately five hours of course work …
Properties of Water Lab: AP Biology Lab 1 ʼ - Ms. Ryman's …
Use your pipette to drop tap water onto a penny, one drop at a time. Count how many drops you can add before any water spills over the edge. Record the number of drops in your data table. …
DENSITY OF PENNIES LAB REPORT GUIDE - Hazleton Area …
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Lab: A Penny For Your Thoughts - Mrs. Ochoa's Chemistry …
Lab: A Penny For Your Thoughts Background Information: Density is defined as the ratio of mass to volume, and its formula is density = mass ÷ volume.The units for mass are grams (g).The …
MODULE: Intermolecular Forces (IMF) and Acid Base …
Workings in pairs determine the number of drops a penny can hold for each of the 4 solvents (water, ethanol, acetone, pentane). Insert your data in the table below. ... to the lab). Answer …
PENNY FOR YOUR THOUGHTS ON INERTIA
Cover the cup with the index card and center the penny above the cup on top of the card (See Figure 1). 2. Try to figure out how to get the penny into the cup without lifting the card and only …
Answer Keys - Pearson English Portal
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Chemistry: Half-Life of Radioactive Isotopes Introduction:
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Chemistry – Radioactive Decay
Neatly answer all questions completely for credit. Show all work. Nuclear chemistry 1 Radioactive Decay Teacher Notes Time: 90 minutes (plus 30 minutes for teacher preparation) ... • Always …
Pearson Chemistry Workbook Sol Prep Answer Key (book)
Pearson Chemistry Workbook Sol Prep Answer Key Antony C. Wilbraham,Dennis D. Staley,Michael S. Matta,Edward L. ... Chemistry Antony C. Wilbraham,2007 Pearson …
Physical Science Answer Key - Valley Oaks Charter School
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Rock Cycle Crayon lab - Deer Valley Unified School District
5. Each lab partner, in turn, should move (erode) and lay down (deposit) the rock fragments in a neat pile in the center of the foil. Set each new pile on top of the previous ones. 6. Answer the …
Analysis Of A Penny Lab Answer Key (2022) - blog.amf
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1 / 5 https://picfs.com/20wrnw - Weebly
Penny-lab-answer-key. Nov 8, 2010 — Part One of this experiment takes old pennies and makes them look shiny and ... Test your solution by dipping one dull penny in for 10 seconds.. Jan 25, …
Kinetic and Potential Energy Worksheet KEY g=9 - DEBOU …
KEY radio, lamp, dishwasher bicycle, T.V. piano mass greater the KE mass and velocity 945 J 308.7 J 8.96 x 10^5 J. 18. A cinder block is sitting on a platform 20 m high. It weighs 7.9 kg. …
Take a Guess - astephensscience
NOTE: You can also give the students a chance to try this demo again after they have completed the penny lab. ... on the lab worksheet. Part C Answer Key - 1. Explain your results from both …
The Penny Lab - Murrieta Valley Unified School District
The Penny Lab CLASS SET-Do NOT take! Pre-lab Questions: (Answer in the Lab section of your notebook in complete sentences!) 1. What do you think Alchemy is? (If you have no idea, use …
A Penny for Your Thoughts - mrswhittsweb.pbworks.com
penny. 3. Use forceps to place the penny in the beaker of hot sodium hydroxide/zinc. 4. After a few minutes, remove the penny with your forceps and dip it in a cup of cold water to cool and …
Lab Activity H20 Cleaning Cents - Anoka-Ramsey …
Lab Report Submission Checklist Complete the appropriate checklist and submit this page along with your lab activity. Lab Activity Submitted Via the D2L Dropbox Prelab assignment is …
LABORATORY MANUAL - Pearson
10 Analysis of a Penny 111 Topic: Writing and Balancing Chemical Equations A. Instructor Demonstration – Combination Reactions B. Decomposition Reactions ... At a chemistry …
mirror practice problems ANSWERS - loreescience
3. A light source 30 cm from a concave mirror on the lab bench produces an image across the room on the wall, a distance of 10 metres away. a) What is the focal length of the mirror? …
Variations on a Human Face Lab - Currituck County Schools
Variations on a Human Face Lab Introduction: Have you ever wondered why everybody has a different appearance even if they are closely ... Each of you will get a penny. (You will have …
Properties of Water Lab - Unbound
General Lab Procedures: With your lab group mates you will be visiting each of the lab stations described below for a specified time span. To begin, your instructor will assign the lab station …
The Evolution Lab ANSWER KEY
The Evolution Lab ANSWER KEY MISSON 4: Biogeography: Where Life Lives Introductory video: 1. Sample answer: They are carried by wind or water from nearby landmasses. 2. b 3. b 4. …
Laboratory: Intermolecular Forces (IMF) - Parkland
will be dropping liquid onto a penny. Be sure your drops are even and that the tip of the pipet is close to the penny without touching the liquid that is already on the penny. Good technique is …
Striking it Rich with Chemistry Lab - Murrieta Valley Unified …
Striking it Rich with Chemistry Lab A. Purpose: To observe how properties of a penny can be changed; to observe how the properties of copper can be changed. B. Materials/Equipment: …
The Scientific Method
2. Begin the Penny Lab after collecting your materials. 3. Turn in the Penny Lab write-up to your teacher after completing it. 4. Do the Scientific Method Practice 2 activity for homework. Be …
Scientific Method Review Answer Key - Deer Valley Unified …
the following statements are observations and which are inferences? Indicate your answer with either the letter "œ' for an observation, or letter "l" for an inference. It is wintertime . It is night …
Penny Lab Answer Key (PDF) - interactive.cornish.edu
Penny Lab Answer Key: This Is Your Brain: Teaching About Neuroscience and Addiction Research Terra Nova Learning Systems,2012 The need for studentsOCO understanding of …
Electroplating Lab - UC Davis
Electroplating Lab CHEM 401 . 1 . Electroplating Lab . Objective . In this lab you will be electroplating zinc onto a penny, copper onto a nickel, and calculating the number of moles of …
