<p> It is a mystery! Can you solve it using your science skills?!!!!!</p><p>Is it possible? Could Krispy Krème donuts be coming to Aramco? </p><p>That was the plan- but now there is a big problem. The owner of the donut shop has been murdered!! The police need an investigative team to determine the person responsible for the murder. If we don’t find the killer- the donut shop will never be allowed to open! The Aramco coroner has determined through examination of the body that the murder occurred between 9pm and 10 pm Thursday night.. There are 5 suspects- all future bakers at the donut shop. The men had all been invited to interview for the job of head baker at the donut shop. What do the police know? The body was found yesterday at 12:30 am by the janitor when he entered the kitchen. A mysterious white powder was found at the scene of the crime and on the victim. By analyzing the mysterious powder, the police are certain we will be able to determine who the killer was. We are going to use our science skills to solve this crime! </p><p>The facts are as follows: Only one of the bakers entered the bakery yesterday at 8 pm. He had been asked to get the kitchen ready for the test trials the bakers would be doing later in the evening. He set up 4 of the 5 large containers of baking powders on the counter. He did not set up the fifth powder because he was allergic to it. The other 4 bakers arrived at the bakery at 9 pm. One of them set- up the final powder when he came in at 9 pm.. None of the other bakers had exposure to 4 powders. The bakers make the donut dough in an assembly line that causes them to have contact with 3 powders (at the most) during the workday- one powder they work on and one powder from each of the neighbor bakers. (Remember- the baker setting up the kitchen was exposed to more powders). Powders from all 5 suspects’ aprons have been collected. On the counter we have the five baking powders present in the kitchen: alum, baking soda, corn starch, salt, and sugar. We also have the powders from the 5 bakers and the powder found at the scene of the crime. You will have to analyze the powders and determine the guilty baker!</p><p>You will have to use the physical and chemical properties of the powders collected from the kitchen and compare them to the powders found on suspect’s aprons. You will then have to compare the data you collect to the properties of the powders left at the scene of the crime.</p><p>But first, to determine if you are ready to investigate this crime- you must answer the following questions:</p><p>What is an observation?</p><p>What is a physical property?</p><p>What is a chemical property? Procedure: 1) Analyze the physical and chemical properties of each of the known powders found in the kitchen. 2) Record your observations and data in the table below. 3) Analyze the physical and chemical properties of each of the powders present on the aprons. 4) Record your observations and data in the table below. 5) Analyze the mystery powder left at the scene of the crime. 6) Record your observations and data in the table below. 7) Analyze the data and determine the murderer!!</p><p>Texture Reaction Reaction to Powder Reaction to Reaction Reaction to shape to baking iodine to heat water size vinegar soda water Alum</p><p>Baking soda</p><p>Corn starch</p><p>Salt</p><p>Sugar</p><p>Suspect #1</p><p>Suspect #2</p><p>Suspect #3</p><p>Suspect #4</p><p>Suspect #5</p><p>Mystery powder</p><p>Which of the properties tested were physical properties?</p><p>Which of the properties were chemical properties? Which physical property of each powder would help you identify it? Explain your choice! alum salt Baking soda Corn starch sugar</p><p>Which chemical property of each powder would help you identify it? Explain your choice! alum salt Baking soda Corn starch sugar</p><p>Which powders were in the suspect’s aprons?</p><p>Suspect #1 Suspect #2 Suspect #3 Suspect #4 Suspect #5</p><p>Which powders were in the powder found at the scene of the crime?</p><p>Which properties helped you determine the mystery powder?</p><p>Which suspect committed the crime?</p><p>Scientific Method Review:</p><p>1. What was the control in the experiments you did?</p><p>2. What were the constants?</p><p>3. What was the independent variable? </p>