Distillation Introduction: The recrystallization technique you learned last lab is a method for purifying solids. This week we will learn how to perform a distillation‚ a method for purifying liquids. Distillation is a common wet-chemical technique for separating organic compounds based on differences in boiling points. Upon heating a mixture of organic compounds‚ the more volatile compounds (those with the lowest boiling point) will vaporize first (i.e. be converted to gases)‚ leaving the higher-boiling
Premium Distillation Evaporation Gas
SYNOPSIS ON RECRUITMENT AND SELECTION PROCESS SUBMITTED BY:- PREETI JHA PGDM 1 “C”
Premium Scientific method Human resource management Exploratory research
Long stands of double helical DNA can fit into the nucleus of a single cell because DNA is specially packaged through a series of compaction events to fit easily within cell nuclei. Even though the length of DNA per cell is about 100‚000 times as long as the cell itself‚ it only takes up only about 10 percent of the cell’s volume. The DNA molecule‚ in order to condense‚ wraps itself around groups of histone proteins‚ and then the chromatin folds back on it‚ nucelosomes pack together to create a compact
Premium DNA Gene Cell nucleus
The Scientific Method 1. Choose a problem. (What do you want to explore? Ask a question about it.) * Choose something that interests you. * Choose something that you don’t know the answer to. * Choose something you can work with. Which soda decays fallen out teeth the most? 2. Research the problem. (How can you find the answer to your question?) * Look in books. * Get advice. * Make observations. If you take your teeth‚ put them in a glass‚ pour soda over them and let them stand
Premium Tooth enamel Dental caries Teeth
TETRANCHUS URTICAE AND THE GREENHOUSE STRAWBERRY PLANT Mites belong to the Chelicerata‚ a branch of arthropods and the second largest group of terrestrial animals. Within the order Acari‚ spider mites belong to the Acariformes with fossils dating from the Lower Devonian period 410 million years ago (Edgecombe‚ G. D.‚ 2010). The two-spotted spider mite‚ Tetranychus urticae‚ is a web-spinning mite. The name refers to their ability to produce silk-like webbing used to create
Premium
conducting or benefiting from the research and the purposes for which the findings will be applied. Decisions about which kind of research method to use may also based on the researcher’s own experience and preference‚ the population being researched‚ the proposed audience for findings‚ time‚ money and other resources available. Field Observation & Scientific Observation Casual & everyday‚ Direct observation‚ unaided by
Premium Scientific method Observation Sociology
number of fish. 3. What would your experimental approach be to test this hypothesis? Have two fish tanks connected by a small tube. I’ll have both fish tanks with bad water quality. One of the fish tanks will slowly increase its water quality by using a filter. 4. What are the independent and dependent variables? The independent variables are the number of fish observed and the dependent are the dissolved oxygen 5. What would be your control? The fish that are in the tank without
Free Scientific method Hypothesis Water
Advances on DNA based method in Food Analysis Food Analysis From the introduction of the application of science in the study of food and consumption‚ it has been observed that analysis played a key role in the Food industry. From determining composition to the presence of adulterants‚ food analytical methods are essential in maintaining quality and integrity of food products for consumer use. The Speed and Accuracy of the results are crucial in choosing a method for analysis. Methods which are
Premium DNA Polymerase chain reaction Molecular biology
The Strawberry Festival has now become an annual tradition at USD where the dining services provide free food for the students and faculty. Throughout the festival I surprised to see the amount of students that attended because they did not advertise as much as I expected them to do so I thought the students were not well informed. However‚ in the Student Life Pavilion (SLP) at tables they did have a small sign that advertised it as well they sent out an email to inform us however in the SLP student
Premium
Extraction of Caffeine from Tea leaves Casinabe‚ Antonio Karlo‚*Catahay‚ Jesus Alfonso‚ Cerdena‚ O’neil‚ Cordova‚ Robelle Department of Biological Sciences‚ College of Science University of Santo Tomas‚ España Street‚ Manila 108 Group 4 2MB Date Submitted: December 13‚ 2012 ------------------------------------------------- ABSTRACT: The purpose of this experiment is to extract the amount of caffeine present in tea bags. In this experiment‚ isolation‚ characterization and purification
Premium Caffeine Chemistry Tea