Which contaminant seemed to have the most potent effect on the water? The effects of the contaminated water were that the mixture showed each water type to have a brown color to them. The water type that seemed to have both a surprising and potent effect was the water and soil mixture. I would have thought with using strictly water and potting soil the water turned the darkest brown out of all the other contaminants that I used for the mixture. The vinegar and soil mixture seemed to have cleaner look to them.
Exploring enzymes through Lactex. Problem: Does pH affect the results of Lactex? Independent Variable: pH value Dependent Variable: Glucose Control: Lactex enzyme Hypothesis: I think pH will cause the result of Lactex to change. Materials: · Soap (basic) · Antacid (basic) · Soda (acidic) · Vinegar (acidic) · pH test strips · eye dropper · Cow’s milk Experimental Design: 1. Set up plastic cups 2.
As the drops are being added, a distinct yellow color can be observed where the drops were landing in the solution. The solution then turned blue-green and very cloudy when about 50 drops of NH3 were added. A distinct dark blue color was evident where the drops were landing in the solution. Also, there was an emission of gas while the NH3 was being added. Another change of color and clarity is evident when 15.0mL of H2SO4 was added to the
Caffeine effect on Daphnia’s Heart Rate The experiment will show what and how caffeine affects the heart rate of the Daphnia (Water Flea) Hypothesis * The Daphnia’s heart rate will increase as the caffeine concentration is increased Daphnia A Daphnia is a tiny invertebrate, crustacean (related to shrimp) that has a clear outside skeleton (carapace) and jointed legs. Daphnia are ectothermic (cold-blooded), their body temperature changes with the surrounding environment. Extra reasoning Chemicals which enter Daphnia’s bodies can change their heart rate by interfering with the chemicals that nerves use to transmit signals. Chemicals that speed up heart rate are known as stimulants (Caffeine is an addictive stimulant) Caffeine increases the number of stimulatory neurotransmitters that are released which increase blood pressure. Method * Firstly create your solution of caffeine which you are going to use on the Daphnia, from 100% concentration (0.1) to 0% concentration (Pond water) * Secondly collect the Daphnia, using a pipette to extract one Daphnia from the fresh pond beaker.
One teaspoon of salt and one teaspoon of baking soda were put in two separate transparent glasses of water and then the time of dissolving of each substance were calculated. The results showed that the baking soda dissolves better in water than the salt. My hypothesis proved to be correct. To improve this study I would use a type of salt
White Matter 2. Gray Matter 3. Myelinated fibers 4. Unmyelinated fibers
In conclusion, the data from the goldfish respiration lab supports my hypothesis. My hypothesis was that if I were to put the goldfish in the 27OC water then the goldfish will breathe faster because the water is hotter and the molecules move further apart. Therefore, the fish will have to take more breaths. In 10OC water, the goldfish will take fewer breaths because in colder water the molecules move slower and they are closer together. As a result, it will have to take fewer breaths.
(TCO 2) What are the three types of reliability? Explain each in detail. (Points : 7) Question 3. 3. (TCO 2) Explain how the National Crime Victimization survey is conducted.
Name Section Unknown Laboratory Project – Identification of Unknown Organism Project Set-up (14 pts) Name media type and forms used: Broth tube, Agar slant and agar streak plate Temperature of incubation: 37C with an incubation period of 18-24 hours (lab Manuel- pg 25) List 5 steps/procedures you followed to prevent contamination of your culture. 1. aseptic technique 2. Flaming inoculator 3. heating the tubes 4. not talking over the specimen while you are inoculating 5. close the streak plate when not in the process of inoculating List the 5 procedures you will perform to identify the unknown. 1. inoculate agar slant 2. inoculate
Caffeine & Alcohol Effect on the Water Flea Heart Rate Abstract In this study, water fleas (Daphnia magna), a semi-transparent freshwater crustacean, are used to study the effects of caffeine and alcohol on heart rate. There was a control group used along with the alcohol and caffeine to ensure the results were more accurate. The prediction was the introduction of alcohol and each increased concentration of alcohol, would decrease heart rate and the introduction and subsequent increased concentrations of caffeine would increase heart rate. The results of this experiment proved the prediction to be correct with the alcohol, but the results from the caffeine were hardly noticeable. Methods & Materials