Introduction: Sow Bugs, small land crustaceans, have oval bodies with armor like plating, live in humid and cool environments such as logs and leaf litter, and are chosen to be used to test for taxis, movement towards or away from a stimulus. Both chemotaxis, movement in response to chemicals, and phototaxis, movement in response to light, are tested in this experimental procedure. The purpose of this experiment is to test the response of Sow Bugs to a light and a chemical source, showing whether they exhibit taxis to a certain stimulus. Body spray was used because it exhibited all the attributes of a potential chemical substance. It has color and smell and being in a liquid and a gas form.
POST LAB QUESTIONS Develop hypotheses on the ability of oil, vinegar, and laundry detergent to contaminate groundwater. Oil hypothesis = Oil will not contaminate or change the amount of water filter. Vinegar hypothesis = Vinegar will contaminate through the soil allowing the water to filer through. Laundry detergent hypothesis = Laundry detergent will contaminate the soil by allowing the water to pass through. Based on the results of your experiment, would you reject or accept each hypothesis that you produced in question 1?
A Single Substance can be isolated from a Mixture. The substance is tincture of iodide, used to clean and infect wounds. To be able to isolate we used filtration, evaporation and extraction. Confidence Report In the South Street Seaweed Seaport Lab, I am confident in the Tincture of
An example of use is cleaning compounds of impurities, where different solvents work as a molecular filter that interacts differentially with compound and impurities respectively. In the end of the process, impurities become physically separated from the now pure compound, facilitating further transferring and further repurification / extraction if needed. MATERIALS AND METHODS Acetanilide tert-butyl methyl ether p-tert-butylphenol p-toluic acid 0.5M NaHCO3 3M HCL 0.5M NaOH NaSO4 anhydrous Separatory Funnel Buchner filter paper Sand Bath Microspatula Disposable Pipet heated plate boiling chips support stand Pasteur pipets with latex bulb test tubes (2) utility clamp watch glasses weighing paper melting pint capillary tubes thermometer EXTRACTION •Dissolve acetanilide, p-toluic acid, and p-tert-butylphenol in t-butylmethyl ether •Extract p-toluic acid from the ether layer with NaHCO3 solution •Extract p-tert-butylphenol from the ether layer with NaOH
To observe the change in properties of various synthesized copper compounds in order to identify the reactions and products being formed. Secondly, to become familiar with methods of separating compounds through decanting, heating with Bunsen burner and suction filtration system. In doing so, be able to recover copper metal and interpret the resulting percentage yield by applying the law of conservation of matter. Upon combining 20.0mL of NaOH to 10.0mL of Cu(NO3)2 and stirring the solution, there was a darkening of the initial blue color. Adding distilled water to the solution lowers the initial intensity of the blue color, bringing back to a lighter blue.
Allow the splint to burn until the color fades. Don’t let any solids to fall into the burner. -Soak the wooden splint in the “rinse water” to put it out completely; move it to trash. -Record observations on flame color produced by the metallic salt in the Data Table. -Repeat above steps (middle section) for all metallic salts (five total).
Name: ______________________ Date: ________________________ Student Exploration: Density Laboratory Vocabulary: buoyancy, density, graduated cylinder, mass, matter, scale, volume Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Of the objects below, circle the ones you think would float in water. Why do some objects float, while others sink? ____________________________________ _________________________________________________________________________ _________________________________________________________________________ Gizmo Warm-up The Density Laboratory Gizmo™ allows you to measure a variety of objects, then drop them in water (or other liquid) to see if they sink or float. An object’s mass is the amount of matter it contains.
What is a calotype? What happens in this process? Calotype, which was used of paper coated with silver iodine. This process involved sensitizing paper with a silver salt solution and exposing it to light. This created a negative image of the object or person, which could then be used to create contact prints where the light and shadows were reversed to show the image.
During blood feeding, the damage caused to the host blood vessels usually results in vasoconstriction that may increase insect feeding time due to restricted blood flow to their mouth parts. Blood-sucking insect saliva usually contains components promoting vasodilation. Vasodilators such as, a peptide tachykinin has been characterized in Aedes aegypti that facilitate efficient blood feeding. Tachykinins also act as pharmacological
Running Head: CRITICAL THINKING RESPONSE PAPER; SENSATION AND PERCEPTION Critical thinking response paper; Sensation and Perception Diego A. Bustos South University - RPB PSY 1001: Introduction Psycology Phil Yeager March 6, 2012 Though much related, perception and sensation plays two different but complementary roles on how human beings interpret their world. Sensation is the process by which human’s sense their environment basically through touch, sight, smell, taste and sound. On the other hand, perception is how this information is interpreted in the brain to thus help an individual to make sense of the environment around (Coon & Mitterer, 2008). In psychology these two are a topic of great discussion and often leaves more questions than answers when it comes to how they work or relate. The human mind is very flexible and will make organs respond to stimuli.