Crime Buster is on Facebook. Join Facebook to connect with Crime Buster and others you may know. Facebook gives people the power to share and makes the. To download Symbian game Crime Buster for free, we recommend you to select your phone model, and our system will select the most suitable sis files of the Crime. Crime Busters - Science Olympiad Student Center Wiki. In Crime Busters, students will identify perpetrators of a certain crime by identifying unknown powders, liquids, and metals, and analyzing hairs, fibers, plastics, fingerprints, DNA evidence, shoeprints, tire treads, soil and splatters. Students will also analyze evidence from paper chromatography. Students should be able to use this data to answer some questions about who committed the crime and how the evidence supports their argument. Find answers for the crossword clue: Crime buster. We have 2 answers for this clue.This event was previously known as Science Crime Busters, but was changed to Crime Busters after the 2. If you're using lab aprons, make sure you're wearing long sleeves that reach the wrists. Closed toe shoes, NO sandals. Pants or skirts that cover the legs to the ankles. Indirect vent Goggles (ANSI Z8.
Also, the team should and may have the following. Up to five pages with information on the front and back. Writing instruments(pencils!)Paper towels. Magnets. Microscope slides and cover slips. Tweezers or forcepsp. H paper. Hand lenses. Test tubes and racks, spot plates, well plates, reaction plates or similar small containers for mixing. Something for scooping, stirring, and mixing. The supervisor will provide everything else you need, so if you bring anything outside of what the rules allow you will be penalized. Before the competition (at school practices)Check with your SO coach to get the following materials to test. Powders (Italics means it can be used in mixtures). White Sand. Calcium Carbonate. Table Salt. Sugar. Flour. Cornstarch. Gypsum. Baking Soda. Powdered Gelatin. Powdered Alka- Seltzer. Sodium Acetate. Liquids. Rubbing Alcohol. Household Ammonia. Hydrogen Peroxide. The coach will also need- . M HCl (hydrochloric acid). Iodine. p. H or Litmus paper. Make a chart for testing. For powders, include color, reactions with water, HCl, and Iodine; odor (distinct, faint, or none); shape (crystalline, granular, or powder), solubility (whether it dissolves in water or not), and reaction to p. H or Litmus paper. For metals, include reactions to HCl and magnetic property (yes or no). For liquids, include smell, reactions to p. H or litmus, and color. With your teammate, memorize the results (this is where two heads are better than one) and try testing unknowns made by the coach or other team members. If you can do this, it helps very much when it comes time for the competition. They only specify what can be tested for, but not how they can be tested. Titrations, probes, and colored strips are some possible methods used. Below is a table of the very basics on each of the things that they can ask about and have you test for- . You then had to match you data (the crime scene liquid) to data provided for the liquids that the suspects were carrying (their water bottles) and say which it came from. There were 4 strips (so 4 tests total),similar to these. All in all, it wouldn't take you more than 5 minutes max. For the p. H portion, I think it was done using indicator dyes, though I have almost no clue, because they said we could use p. H paper instead if we wanted. As far as the titration, they had someone there to explain how to do it, and written instructions. You filled a container with the liquid, then added a certain number of drops of an indicator and a certain number of drops of another chemical, mixing continuously. You then had a tiny syringe filled with another chemical and you slowly added it, mixing constantly until the solution turned purple (it was pink beforehand). I was terrible at this, so it took me around 2. I would recommend practicing this at least once, because it seems like something that they give at a fair number of competitions). No preparation was needed to understand how it worked, since they gave written and verbal instructions). You then had an observation/conclusion sheet to record information. You wrote down the probe used and the numerical value received (0. To get full credit (5 points), you needed 5 data entries and 5 conclusions based off those entries. Here is what we had (I don't remember the numbers)- . DO- ### (low)- There is very little dissolved oxygen in the liquid. Temperature- ### (room temp.)- The liquid is about room temperature. Conductivity- ### (high)- The liquid conducts electricity very strongly. H- ##.# (high)- The liquid is very basic. Temperature- ### (same as first entry)- the liquid does not change temperature over time. I'm not sure if the last one was what they wanted, but there were only 4 probes and you needed 5 tests, so we put that down. Do the necessary tests to figure out exactly where it came from. Since it was very basic and a strong conductor, we said it was from the freezing coils in the freezer (again, I don't know for sure if that's right). They didn't ask any supplemental questions about water testing, like they do for the powders, liquids, fingerprinting, DNA, etc. Fill a small well in your testing tray with the liquid, put in a few drops of iodine and stir. After about a minute (though sometimes more), tons of bubbles will appear if it is hydrogen peroxide, while nothing will happen in water (besides the color change due to iodine's color). First, tin often has a yellowish tint, which aluminum will never have. Next, tin is often fairly shiny, while aluminum is dull. Lastly, if the metal is very malleable, it is probably aluminum (think aluminum foil). Everything left is neutral or basic and non- biological. If there appears to be a powder and a crystalline component, add HCl or iodine to a sample. If the iodine turns blue, finding the first component will be straightforward because you will only need to find the p. H of the mixture with water. A more neutral p. H will mean that the noncrystalline component is flour; a more basic p. H will mean cornstarch. If the iodine fizzes (and the HCl), then the component is Alka- Seltzer. A fizz with only the HCl means the component is either Ca. CO3 or Na. HCO3. Once again, a p. H test will show the difference: a neutral p. H means calcium carbonate, and a basic p. H means baking soda. No reaction means gypsum. To find the crystal, test for solubility. Sand will not dissolve, whereas salt and sugar will. The difference between the latter two is that salt has cubic crystals, and sugar has irregular crystals. Once again, a component that does not dissolve is sand, and a component that does is either salt or sugar, which can be differentiated by crystal shape. If both dissolve, the mixture is salt and sugar (probably the single most common mixture in this event). Go off of the information above to find each, and use logic if two things react at once. You put a dot of ink at one end of a strip of filter paper. Then, get a small cup of solvent (often d. H2. O) and put the paper on the cup just so that the ink dot is above the water line. Wait for the colors to separate and that's it! Once you have taken the paper out, quickly put a line in pencil where the top edge of the water is on the paper. This allows you to find the Rf (retention factor) value of any ink spot if they ask, or they might be looking for it for full credit. Alcohol- soluble markers and pens will not work, and if they do, the results won't be very visible. Using water- soluble markers/pens like Expo Vis- a- Vis will get you the best results. There are 3 basic categories of fingerprints(arches, loops,and whorls). They are easily identified by there general shape and number of deltas (triangles made from ridges). Make sure you know if your event supervisor is looking for the basic type (loop, arch, whorl), or the more in- depth name (Tented Arch, Ulnar Loop, etc.). HDPE, LDPE, and PP float in water while PETE, PVC, and PS do not. This means that the first group has a density less then one and the second group more then one. A more precise method can be used if you are provided with corn oil, a certain percent concentrated solution of hydrogen peroxide, and a certain percent concentrated solution of salt water. Identifying the polymers in the first group is easy. HDPE and LDPE are translucent while PP is not. HDPE is relatively more translucent then LDPE. Identifying in the second group is also fairly simple. PS will SLOWLY drop down in water or half of the flecks will sink while the other will float. PVC is sometimes rubbery, but never transparent, while PETE is always clear. Under a microscope, the analysts looks for lengthwise striations or pits on a fiber's surface, or unusual shapes. So, ALWAYS, ALWAYS save enough time for you to get it done right! Talk about every piece of physical evidence that points to that person. To connect someone to the crime scene, you would see a connection like . Write about a sentence for each person (more than a sentence if there is a lot evidence pointing towards them and you have to explain more in depth why it wasn't them). If there is a lot of evidence against a second person, but you're sure it wasn't them, then talk about a logical reason why there would be all of that evidence (for instance, . Also, even if someone has no evidence against them, say that in your essay: . This can add a lot to your essay, and help support your claim even if you have the wrong person. Some proctors may set up the test to point to two people working together, or they may leave insufficient evidence to point to anyone. If either is the case, adjust your essay structure to fit your claim and make a logical explanation. If correct, you will likely do very well. If incorrect, a logical explanation should get you a decent amount of credit for the essay anyway. A simple, yet effective structure goes as follows- . Intro Sentence- i. Also, Joe's fingerprints and DNA were found at the crime scene. Then, look at the test and see how long you think it will take or how much there is to do. If it is a lot, make sure you split up the work because you don't want to have wasted potential and then not finish. While the chromatography is going, identify all the unknowns using tests (see section above).
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