experiment‚ there was a total of 2.25g of caffeine (the net weight of the tea bag). After preparing the tea solution‚ extracting‚ drying and evaporating the weight of crude caffeine was .0321g‚ making the percent recovery before sublimation 1.43%. After sublimation the weight of pure caffeine was .0027g‚ making the percent recovery of caffeine after sublimation .12%. The percent recovery of caffeine is less in the second half of the experiment because the crude caffeine had some impurities in it which were
Premium Caffeine Chemistry Tea
9-10-13 Title: HPLC analysis of Caffeine Lab Partners: Objectives: 1) The main objective of this lab is to gain experience in using and reading results from the HPLC machine. 2) The first step is to inject a series of caffeine standards into the machine in order to get results/values of peak height and area. 3) The next step is to investigate the effects of a series of HPLC parameters on Retention time‚ peak height and peak area. 4) To use above data from peak height and area to construct
Premium Chromatography High performance liquid chromatography
who did not consume the caffeinated beverage. In a recent article published in The Journal of Gerontology‚ Series A: Biological Sciences and Medical Sciences‚ scientists found that caffeine can provide cognitive benefits later in life and can help with dementia. “Compared with women who consumed a low amount of caffeine (defined in the study as less than 64 milligrams daily)‚ those who consumed a higher amount (more than 261 milligrams daily) were found to be at 36 percent reduced risk of a diagnosis
Premium Hypertension Caffeine Coffee
Journal of Geographic Information System‚ 2011‚ *‚ ** doi:****/jgis.2011.***** Published Online ** 2011 (http://www.scirp.org/journal/jgis) Algorithmic Foundation and Software Tools for Extracting Shoreline Features from Remote Sensing Imagery and LiDAR Data Hongxing Liu Department of Geography‚ University of Cincinnati Cincinnati‚ USA E-mail: Hongxing.Liu@uc.edu Douglas J. Sherman Department of Geography‚ Texas A&M University College Station‚ USA E-mail: sherman@geog.tamu.edu Lei Wang
Premium Remote sensing Image processing
not drink coffee? These days lifestyle of children has been changing regarding the way that children drink. Caffeine is one of the biggest problems in the world. Most companies make many things from caffeine such as coffee‚ tea‚ chocolate‚ soda‚ and Energy Drinks. However‚ children under 18 years old don’t know if these things can be dangerous for their health. Children eat or drink these things because parents didn’t tell them that are not good for their health. Children drink coffee every day
Premium Coffee Caffeine
Lab Report Quiz!!! | | | LabRepQuiz010 Question MC #19: All are true of the Materials and Methods section except___.Answer | | | | | | | | | | * Question 2 1 out of 1 points | | | LabRepQuiz010 Question MC #7: Which of the following is the best written sentence that includes the information below taken from an article written by Dr. Costanza‚ but avoids plagiarism? -A decade of research from Sunshine Health Clinic has shown that 20 minutes of exercise a day can
Premium Thyroid Energy Endocrine system
encoded by EZH2‚ the EZH2 gene encodes part of the Polycomb group which make protein complexes that help to maintain genes transcriptional repressive state over successive cell generations. http://www.ncbi.nlm.nih.gov/gene/2146 Throughout this lab report template DNA that contains the gene EZH2 was provided‚ this will be amplified by a PCR and cloned into a vector. This Polycomb group proteins help maintain the cell identity during progress through chromatin
Premium DNA Gene Protein
Laszlo Vass‚ Ed.D. Version 42-0027-00-01 Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions‚ diagrams if needed‚ and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable
Premium Telescope Lens Optics
A. Goal and Purpose: Session 1: In this lab‚ we will achieve a simple Friedel-Crafts alkylation of anthracene. The choice of anthracene as an aromatic substrate stems from two considerations. First‚ there is a question of regioselectivity. Second‚ anthracene and its derivatives are highly visible under UV light. Session 2: In this lab‚ we will complete a partial conversion of 9-acetylanthracene using m-chloroperoxybenzoic acid (mCPBA). We will also determine by NMR‚ the regiochemistry of the
Premium Sodium Chemistry Temperature
Title: Caffeine: The pros and cons of consumption Specific Purpose: At the end of my speech‚ the audience will be educated on the what caffeine is and the advantages and disadvantages of caffeine consumption. Preview of Main Points: I will be explaining what caffeine is‚ the benefits and the effects it has on us. Introduction (Attention Getter) How many for you consume caffeine on a daily basis? (Central Idea (Introduce topic and relate it to your audience)) In an article from fda.gov
Premium Caffeine Coffee Obesity