Science Olympiad Crime Busters

Science Olympiad Crime Busters Arch - answera hill with no deltas tented arch - answeran arch with a sharp corner at the top point plain arch - answeran arch with a more rounded top point loop - answera beanish shape with one delta ulnar loop - answera loop pointing towards the pinky radial loop - answera loop pointing towards thumbs whorl - answera circle like shape with 2 or more deltas plain whorls - answerhas 2 deltas and at least one ridge making a complete circuit central whorls - answerconsists of at least one re-curing ridge or an obstruction at right angles to the line of flow double loop whorls - answerconsists of 2 separate and distant loop formations with 2 separate and distant shoulders for each core accidental whorls - answerconsists of 2 different types of patterns with the expeptation of the plain arch Vegetable fibers - answerBurn Test Observations: (cotton and flax, Cellulose based) 1. Does not shrivel away from flame 2. Ignites immediately with contact to flame, burns really quickly and readily in flame. 3. Continues to burn, has an "afterglow" when removed from flame until fibre expended 4. Smells likes burning paper 5. Ashes are fluffy, small, white to grey-coloured Synthetic fibers - answerBurn Test Observations: 1. Won't light in flames but melts close to the flame. 2. spirals back to stick to the tweezers. 3. Smells of black smoke like burning plastic, slightly sweet. 4. No Ashes, the fibers curl back. A wide variety of synthetic fibers all have trade names such as Nylon, Orlon, Dacron, Vinyon, Aralac, Acrilan, Velon, Dynel, Banlon and Lycra. Like rayon, these fibres resemble silk, and under the microscope look like smooth, lustrous, regular shaped cylinders. Synthetic fibers are easily identified because of their uniform thickness (the thickness of natural fibers varies). Wool - answer1. Wool is the most commonly used animal fiber, it normally is obtained from the soft, hairy covering of sheep and sometimes goats. 2. The fiber is stretchable, easily absorbs water, soft and long lasting, doesn't wrinkle and springs back into shape, and has short fibers. 3. Wool fabric is known for its ability to "breathe" keeping wearers warm in the winter and somewhat cool in warmer weather. 4. Wool picks up static electricity easily when rubbed. 5. Dissolve in bleach. 6. Under the microscope, the wool fiber looks like a long cylinder with distinctive scales on it. The fiber is very curly and springy. Burn Test: Hard to light, wouldn't stay lit, smells of burning hair. The ashes is very hard, stuck to the fiber sample. Silk - answer1. Another common animal fiber, was once quite popular, but has been replaced to a great extent by such synthetic fibers as Nylon, Orlon, and Dacron. 2. Silk is made by the mulberry silk worm when spinning its cocoon. 3. Will dissolve in bleach. 4. Under the microscope the silk fiber appears as a thin, long, smooth and shiny cylinder. The fiber is double strands. The fabric is lightweight but can keep its wearer warm Burn Test: Rapidly burns with uneven flames, smells of burning hair, the ashes are very brittle. Cotton - answer1. Cotton is the most widely used plant fiber, it's the hairs found on the seeds of the cotton plant. 2. The fabric that cotton produces is soft, absorbs water, and wrinkles easily. Cotton is a fabric that is light and cool.