The Case of the Snack Shack Based on

The Case of the Snack Shack Based on the 4 th grade BCPS “CSI: As a Matter of Fact” unit Written by L. Shaw ©March 2010

Introduction Every spring Jazmin has a lemonade stand to earn money to spend during summer vacation. Her customers always buy lemonade from her and tell her that it's delicious. This year, as soon as her neighbor takes his first sip, he spit it out in disgust! Jazmin tasted it herself and agreed with her neighbor's response. Yuck! It was bitter. What happened to the sweetener she had added? You have been called in to give your scientific viewpoint. You will study the scene and the clues to catch the culprit.

Task Your job is to figure out 'whodunit'. As you study the clues, you'll learn about the states of matter, solubility, the difference between acids and bases, and fingerprint analysis. Once you have your background information, you will compare the fingerprints at the crime scene to the possible suspects. You will submit your idea of the suspect to the Head Detective. You must have evidence to prove yourself worthy of a promotion.

Process-1 1. Before we can begin to help Jazmin solve her lemonade mystery, we need to gather background information as well as clues from the crime scene. You will start by reviewing the 3 states of matter. 2. Visit this website: Matter and complete this graphic organizer with information you learn. 3. Learn about the properties of matter at this website: Properties of Matter. This will help you examine the clues to find out what’s wrong. 4. Show what you’ve learned by completing the Expectations form. This will be what you should see when examining the matter at the scene of the crime.

Process-2 1. Read only the first two sections “Solutions and Mixtures” and “Can Anything Be In a Solution” at this website Chem 4 kids. 2. Next, try this activity. Mixture Activity (I need to see if this will work in schools; I do not have the plugin at home. ) 3. Show your work on the Mixtures & Solutions Sheet.

Process-3 1. Watch these two Brain. Pop videos to find out about acids, bases, and neutrals. Brain. Pop: Acids and Bases then Brain. Pop: p. H Scale (Please ask your teacher for directions if you need to login. ) While you are watching the videos, you may want to take notes on the Brain. Pop Video Notes page. You will need this information later, and you want to be sure you have your facts straight! 2. Play this Zoom game to learn more and show what you know. 3. Stop and think about the case for a minute. Remember that the bad lemonade tasted bitter. Think about what you’ve learned so far about matter and about acids, bases, and neutrals. What do you think happened to the lemonade? 4. If you have time today after completing your work, you can play the Alien Juice Bar Game for more practice with acids, bases, and neutrals.

Process-4 1. Jazmin checks the bad batch of lemonade. Yup! Still bitter. She checks the jar of sugar. Yuck! This is not sweet like sugar! 2. Jazmin looks out her window and sees her friend and neighbor, Greg, selling lemonade. He sees her and waves, saying, “Boy, I’m glad you’ve stopped selling lemonade. I’ve made so much money!” 3. Using all the information you have gathered so far, what should you do next? March over to Greg & accuse him of sabotaging Jazmin’s lemonade stand. Dissolve some of the powder in the sugar container in water to compare it. Test the bad lemonade to see if it’s an acid, base, or neutral. *Make sure your cursor turns into a pointing hand before you click.

Process-5 1. Those marks on the outside of the container aren’t dirt – they’re fingerprints! Read this section from the FBI to learn about fingerprints then read more to find out about different fingerprint patterns. 2. You tested the container for prints and found 3 different prints as shown below. You got a sample of fingerprints and found that Jasmin has a whorl, her mother has an arch. The third mystery print is a loop. Match the images below with their owner. Jazmin’s mother ? Mystery fingerprint ?

Process-6 1. Since the culprit couldn’t be you or your mom, you begin to think. Dad’s been out of town all weekend. But Greg had come over to play video games. Could Greg have snuck into the kitchen? 2. You buy a cup of lemonade from him and test the fingerprint. 3. Here is the fingerprint from the lemonade cup. Does it match the mystery fingerprint? ?

Process-7 1. Present your findings to the Head Detective using the Accusation Form. Be sure to give specific evidence.

Conclusion Congratulations! You have solved the mystery! Greg confessed to the crime when Jazmin confronted him. He was jealous of all the money she was making and switched the sugar for baking soda. Greg apologized and agreed to give her what he earned in 2 days to make up for it. Good luck in your future endeavors.

Evaluation You will be graded on your work and effort as you solve the crime and learn about chemistry. Category 2 4 6 Work Most of the work is incomplete. Most work is completed or work is not completed to best of student’s ability. All work is completed to the best of student’s ability. Effort Student hardly worked independently and frequently needed to be reminded to focus on task. Student mostly worked independently but often needed to be reminded to focus on task. Student worked independently with few reminders to stay focused.

Teacher Overview • Description: – 4 th grade webquest – An alternative to using paper & pencil from BCPS “CSI: As a Matter of Fact” unit. – Still recommended to complete hands-on investigations in class • Goals: – Students will gain a basic understanding of matter and chemistry. • Maryland State Curriculum: – 4. 4. A. 1. a Identify examples of matter. – 4. 4. A. 1. b Describe and compare the physical properties of matter. – 4. 1. B. 1. a Develop explanations using knowledge possessed and evidence from observations, reliable print resources, and investigations. – 4. 1. C. 1. e Recognize that doing science involves many different kinds of work and engages men and women of all ages and backgrounds. – 5. 4. D. 1. a Investigate and describe what happens to the properties of materials when several materials are combined to make a mixture

Teacher Overview (cont’d) • Accommodations/Differentiation: – Assign students to work in pairs – Provide students with only one part of the process at a time so they are not overwhelmed – Provide a reader and/or scribe. • Assessment: – Students will be assessed on the “Accusation Form”. Students may also be assessed on the notes pages completed during the webquest. • Rationale: – I chose to create a webquest for this particular unit because it is a new unit to the county. I haven’t seen a crime webquest that already exists on an elementary level. I think this will be engaging to students since it varies from the paper and pencil Student Answer and Data book. • Credits/References: – Storyline adapted from BCPS curriculum. – Some ideas borrowed from “Finding the Lighthouse Diamond Thief by Using the Scientific Method” webquest by David Warken at http: //projects. edtech. sandi. net/kroc/scimethod – Fingerprint images taken from http: //www. cyberbee. com/whodunnit/classify. html

Accusation Form I, ___________, (your name) do hereby accuse the following person : ____________ of sabotaging Jazmin’s lemonade stand due to the following reasons: • ____________________________________________ • ______________________ Respectfully submitted, Junior Scientific Investigator

Matter Graphic Organizer Solids: Definition: _________________________ Examples: _____________ Liquids: Definition: _________________________ Examples: _____________ Gases: Definition: _________________________ Examples: _____________ Matter: Definition: _________________________ Examples: _____________ Word Box: Definitions: Anything that has mass and takes up space Something that has its own shape Something that fills all the space Something that takes the shape of its container Examples: brick soda shampoo oxygen book air

Expectations Form What should you see at the scene of the crime? List the properties for each of the objects listed below. Water color _________ texture _________ shape _________ weight _________ state of matter ______ Sugar color _________ texture _________ shape _________ weight _________ state of matter ______ Lemonade Mix color _________ texture _________ shape _________ weight _________ state of matter ______

Mixtures & Solutions Important ideas to remember: • A mixture is when two or more items are mixed together and the physical properties do not change. • A solution is a special type of mixture where the particles are evenly distributed. • A mixture can be easily separated. For example, a salad is a mixture. I can easily pick out the tomatoes from a salad. • A solution is harder to separate. For example, salt water is a solution. I would have to wait a long time for the water to evaporate and the salt to be left behind. Complete the chart below. Read each example and place a check in the correct column. Example: Mixture hot chocolate stew trail mix iced tea powder + water Now think about your investigation: lemonade mix + water sugar + water Solution

Brain. Pop Video Notes Take notes on the two Brain. Pop videos to help you understand the most important ideas. Remember that you will need these ideas to help solve the case. Please watch the two videos in the order shown below. Acids and Bases video: Lemon juice is an ________. It tastes _______ and stings if it gets in a cut. _________ and some _________ are acids too. Anything with a p. H between 0 and 7 is __________. Anything with a p. H between 7 and 14 is ________. Anything at exactly 7, like water, is __________. Chalk, ________, and other _______ products are bases. A base feels _________ and tastes _________. p. H Scale video: Acidic objects are vinegar, ________, & _________. Basic objects include _______, toothpaste, ________ & floor cleaner. Exactly p. H 7, or neutral, is _________. PH paper (also called litmus paper) are strips that are soaked with a chemical indicator. They turn _______ when you dip them in an acid. They turn _______ when you dip them in a base.

You decide to… march over to Greg and accuse him of sabotage. This is probably not a good idea since we don’t have any proof that it was him yet. Let’s keep investigating.

You decide to… dissolve the mystery powder in water. This probably won’t help us solve the case. We know that most powders will dissolve in water. But we do need to figure out what kind of powder is it and who switched it with the sugar.

You decide to… test the bad lemonade. Great idea! This will tell us if the bad lemonade is an acid or a base. Then maybe we can figure out what the mystery powder is. Lemonade is supposed to be acid base *Make sure your cursor turns into a pointing hand before you click.

base Look back at your notes from the videos. Lemons were often mentioned. If water is neutral plus the acidic lemons are added, then the lemonade will be Click here *Make sure your cursor turns into a pointing hand before you click.

acid Yes, that’s right. You learned from the videos that lemons are an acid. Water is neutral, so lemonade would still be an acid. You test the bad lemonade and find that the litmus paper (p. H strip) turns blue. This means that the bad lemonade is acid base *Make sure your cursor turns into a pointing hand before you click.

acid Look back at your notes from the videos. What does the blue litmus paper mean?

Base Right-o! Blue litmus paper indicates a base. Perhaps the mystery powder is baking soda. Baking soda and sugar are both white powders. But baking soda is a base. Now you know what the substance is, but not who put it there. What next? You notice marks on the outside of the container.