What is the function of the fumehood in the Chemistry laboratory? Select the correct response: It lessens the toxicity of various chemicals in the laboratory. O It serves as sterilizing area for pathogenic microorganisms. It serves as storage area for various toxic chemicals.
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- Which activities are likely to cause contamination of stock chemicals in the laboratory? pouring out chemicals from the stock container into another container returning unused stock chemicals to their original container at the end of an experiment swirling the container of stock chemicals to ensure that the contents are thoroughly mixed spilling some of the chemicals on the lab bench and then returning them to the original container inserting a dirty pipet into a container of stock chemicalsChoose any class of biological molecule and describe a disease or condition that is related to a problem with your body using that molecule.What is the purpose of Safety Data Sheets? Why are these important when handling common food service chemicals? What information/components are generally included? How do Safety Data Sheets vary?
- what types of content that we can discuss on this topic? "non-stick cooking utensils- are they safe for us"Different type of methods used in household contaminated wastewater purificationA large population of Japanese beetles infests a plot of cropland. In response to the infesta tion, farmers treat the land with organochlorine pesticides. As a result of the treatment, the population of Japanese beetles is eradicated within the cropland, along with the popula- tions of multiple other insect species. Which of the following statements explains the most likely reason for the death of so many insect populations? Organochlorine pesticides are persistent organic pollutants that interfere with the respi- ratory system of the insect populations. Organochlorine pesticides are endocrine disruptors that interfere with the growth hor- mones of the insect populations. Organochlorine pesticides are persistent organic pollutants and interfere with the re- productive organs of the insect populations. Organochlorine pesticides are endocrine disruptors that interfere with the transmission of nerve impulses, resulting in spasms, seizures, and death of the insect populations.
- Every valentine’s day, CVS sells chocolate-covered cherries. The chocolate-covered cherries are like a mini cake with a cherry inside. The cake comprises a combination of sucrose (powder sugar), butter, cherry juice, and an enzyme (invertase). Time (hours) Sucrose Concentration (g/cm3) 0 0.844 24 0.681 48 0.550 96 0.357 192 0.153 While stored at 5.00C, the sucrose hydrolyzes to produce glucose and fructose. The mixture of the glucose and fructose is a liquid called invert sugar. Below you will find the concentration of sucrose in the cake as a function of time. For the cherries to be edible, the 85% of the sucrose must be hydrolyzed. Before you start to answer the question, create a data table that comprises sucrose concentration in units of moles per liter. Write the chemical reaction that demonstrates the hydrolysis of sucrose. With the data, determine how long it will take for 85% of the sucrose to be converted into…Like anatomy and physiology, chemistry may be a somewhat scary subject for you. Think of it this way: Chemistry is simply the study of matter, its composition, structure, properties, and the changes matter may undergo. Your goal in training as a cosmetologist is not to become a scientist, but to develop a comfort level with the basics and an ability to discuss chemistry in relation to your profession. This will increase your credibility significantly with your clients, especially during the consultation process. In the space provided, write how chemistry affects your everyday life.When purifying a sample of aspirin that was produced in the lab, the impure aspirin sample should be dissolved in a very cold solvent, so that solid impurities can be filtered and analyzed the next day or the next week. True or False?
- Activity 6: Be a Science Detective! Directions: Investigate and analyze the given situation. Provide an explanation for the phenomenon. Based on the kinetic molecular model, solids usually have higher densities compared to liquids. However, ice, a solid form of H2O floats on liquid water which means ice is less dense than water. What do you think is the reason for this phenomenon? What is the biological significance of this concept?Which of the following statements about the BOD test is FALSE? A BOD test is a simple and practical indicator of the total organic content that is available to organisms plus any chemicals that spontaneously react with oxygen. B BOD test measures the oxygen consumed by microorganisms as they break down organic material There is an indirect correlation between the BOD5 value and the level of organic pollutants. The standard test for BOD is the five-day (BOD5) test carried out in the dark at 20 °CBefore slow cooking a meat (for example, in a crockpot/slow-cooker) you will often find instructions to sear the meat on high heat in an oiled skillet for a few minutes before transferring it to the crockpot. The searing is brief – not long enough to cook the meat thoroughly. Despite myth/legend, the searing will not “seal in the juices”. What is the searing for?