resulting mixture on a hot plate to between 60 and 70oC for 15 minutes‚ with stirring‚ then cool to room temperature. Isolate the product by suction filtration and wash it with 6.0 mL of cold distilled water. Suction dry for 15 minutes‚ then dry in air. Determine % yield. Recrystallize about 0.2 g of the crude
Premium Oxygen Water Chemistry
Potato Osmosis Biology SL - ATh INVESTIGATION “Potato Osmosis” INTRODUCTION Osmosis is a process that occurs at a cellular level that entails the spontaneous net movement of water through a semi-permeable membrane from a region of low solute concentration to an area of high solute concentration in order to equalize the level of water in each region. Involved in this process are hypotonic‚ hypertonic and isotonic solutions. A hypotonic solution is one with a lower osmotic pressure‚ indicating
Premium Osmosis
Morcilla‚ Ma Dame Ametrini T. MT11213 Chem 24 Prof. Zenaida Bacsafra COLLAGEN Collagen is a protein found abundantly throughout the bodies of animals‚ including humans. It is a very variable protein‚ forming the basis of many connective and support tissues. It is a fibrous structural protein‚ with a distinctive structure. In fact‚ collagen makes up about one-third of the total body weight. Its name is derived from the French word for glue. Collagen fibers‚ which resemble microscopic
Premium Collagen
selenium between mediums as it cycles through the environment. Once released through the effects of weathering or erosion‚ it enters the secondary environment where it interacts with plants animals and humans. Its bioavailability is important to determine the rate at which it can be removed from soils and water. This and its overall abundance in any given area can cause deficiency or toxicity. 1 Primary 1.1 Elemental state and properties Selenium has a proton number of 34 and mass number of 78.96
Premium Igneous rock Periodic table
Acid Rain Lab #1 Chem. 1 20 February 2016 Concordia University Texas Angelina Luna angelinaluna97@yahoo.com Chem 1- Sect C Acid Rain Lab #1 Professor Koeck Abstract In this experiment our main objective was to create three gaseous oxides CO₂‚ SO₂ and NO₂ by using data that was collected using a pH sensor which was connected to a laptop with LoggerPro and Vernier. We created the gases by bubbling each gas into the water to create the three acidic solutions we were looking for. Once that
Premium Acid PH Base
Abby Goldschmidt Honors Biology 2° Mrs. Gempel September 3‚ 2015 Daphnia Lab Results Paper Abstract The goal of the study was to observe the effects of multiple chemicals on a Daphnia magna’s heart-rate compared to a control (pond water). The different chemicals were caffeine and alcohol. The heart-rate was the main variable in this experiment. The Daphnia’s heart-rate was observed for 15 seconds and then multiplied by 4 to show its heart-rate in one minute. This was repeated 4 times for each
Premium Heart rate
Ecology ➢ Climate is weather conditions of a region like temperature‚ humidity‚ precipitation‚ sunlight pressure‚ winds‚ throughout the year over a period of time ➢ Ecology – is the study of the interactions between organisms and the environment ➢ Abiotic factors –temperature and water ➢ Microclimate – a classification at the small scale variation ➢ Dispersal – movement away fro origin ➢ Macroclimate – a classification at the global and regional level
Premium Ecology Trophic level Food chain
9/16/14 Physics 01L Density Abstract This experiment was conducted in order to determine the density of the Aluminum metal samples provided in the lab. Specific tools such as the vernier caliper and balance scale were used to measure and record the values found. Given that density is a measurement of mass over volume‚ both of these quantities would have to be determined experimentally‚ prior to proceeding with the calculation of the density‚ for each of the
Premium Volume Chemistry Density
J Bus Psychol (2010) 25:201–210 DOI 10.1007/s10869-010-9165-6 A Review of the Empirical Evidence on Generational Differences in Work Attitudes Jean M. Twenge Published online: 18 February 2010 Ó Springer Science+Business Media‚ LLC 2010 Abstract Purpose This article reviews the evidence for generational differences in work values from time-lag studies (which can separate generation from age/career stage) and cross-sectional studies (which cannot). Understanding generational shifts
Premium Generation Y Generation Generation X
Chem 3650 Organic II Lab Lecture Summer 2013 Instructor: Victoria Dougherty M.S. Victoria Dougherty M.S. Office: BSE 1.340 Phone: 458-5473 (I do not have voicemail) Office Hours: Tuesday and Thursday: noon – 1:00 pm (or by appointment) Monday and Wednesday: 1:00 pm to 2:00 pm E-mail: victoria.dougherty@utsa.edu (put Chem 3650 in subject) Lab instructors and sections: Lab instructors Email (put Chem 3652 in subject) Section(s) Times Marilyn Wooten PhD. marilyn.wooten@gmail.com 01T 7:30–11:20
Premium Chemistry Material safety data sheet Laboratory