1. A student neglected to add sodium carbonate when extracting the tea leaves with hot water. Yet a very high yield of caffeine was obtained. The crystals melted at 202-214°C. Explain. • The sodium carbonate is supposed to be added when extracting the tea leaves with hot water in order to help purify the caffeine. So since the student neglected to add sodium carbonate the caffeine won’t be pure but the student would still be able to recover a large amount of caffeine. The literature melting point
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Notes • Matter&Material • Matter-everything around you‚ it is anything made of atoms and molecules. It’s anything that has a mass. Matter is related to light and electromagnetic radiation. Usually found in a few forms and it has 5 states- (Solids‚Liquids‚Gases‚Plasmas‚Bose Einstein Condensates) • Mass- It is the amount of material in an object. It is the same on Earth or Mars. It is the amount of matter which an object contains. • Weight- It is how heavy something is. It is a physical property.
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2008 Background Information Liquids are all around us. Every day we drink and eat items that contain liquids‚ we use liquids to clean ourselves and our belongings and liquids can even be found in the places that we would not expect‚ like televisions. When someone watches liquid over time‚ an interesting thing begins to happen. The liquid will slowly start to disappear. The formal term for the liquid disappearing is evaporation. According to Asminov‚ Liquids are a state of matter that will take
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Recrystallization of Methyl 3-nitrobenzoate Santiago Horta‚ Daniella I School of Chemistry and Biochemistry‚ Georgia Institute of Technology Atlanta‚ GA 30332 Submitted: 18 February 2015 In this experiment‚ the product of a nitration will be purified by recrystallization using a selected solvent. Methyl benzoate is treated with nitric acid and sulfuric acid to obtain methyl 3-benzoate‚ which will be mixed with a solvent that will dissolve the product at its boiling temperature but not at
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Chemistry Chapter 13 Outline Condensed phases: the liquid and solid phases; phases in which particles interact strongly. 13.1 Gas condensed when cooled and compressed. In the liquid state the forces of attraction among particles are great enough that disordered clustering occurs. It is hard to compress a liquid. Liquids diffuse into other liquids with which they are misicible. The natural diffusion rate is slow at normal temperatures. Cooling a liquid lowers its molecular kinetic energy. Solidification
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soluble glass. The solid soluble glass with low module is relatively easy to dissolve in water. The bigger the number is‚ the higher the viscosity is and the harder it dissolves in water; the soluble glass with low module‚ there are many kinds of crystal composition and the cohesive force is poor‚ and when the module number improves‚ the colloid component increases and the cohesive force rises. Soluble glass solution can be mixed with water in any proportion. Different amount of water will lead
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mixture that would be Solid/Liquid would be Skim milk. Although skim milk contains mostly water it also contains casein‚ which is a small protein. The casein protein is so small it may not be thought to be a heterogeneous mixture‚ but if the skim milk curdles the mixture can be separated. A Solid/Liquid solution could be Seawater. The seawater is homogeneous which makes it a solution. The mixture of oil and vinegar to make a vinaigrette salad dressing is a Liquid/Liquid heterogeneous mixture. Due
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Chemistry Lab Report Practical #1 Title: The Densities of Liquids and Solids Date: 29th of August 2014 Session: Friday 1 p.m. Student’s name: Alua Sarybay Lab partner’s name: Gulzhauhar Nurdildayeva Tutor’s name: Eugene Douglass Introduction The matter can be observed by determining‚ measuring and monitoring its chemical and physical properties. In this experiment the densities of liquids and solids will be determined. The density is an intensive property of matter that does not depend
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Experiment #1 Title: Physical and chemical changes‚ and measurements in the metric system Name: Goh Kian Shen Lecturer: Dr. Anne Kee Hooi Ling Section: Chemistry 107A Date lab was performed: 17 January 2013 Aim: The aim of the experiment is to understand physical and chemical changes of
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Pineapple (Ananas comosus) Skin Extract as Component in Making a Moisturizing Soap A Research Project III By: Alfajardo‚ Jessa N. Alforque‚ Bliss L. III-Science Class Submitted to: Ms. Dinna Carangue Research I Adviser CHAPTER 1 The Problem and its Scope Rationale: Cleanliness is necessary to everyone. It affects the people‚ the community and their environment. It is a contributing factor that leads to the goodness of one’s health for a better and safe environment for a healthy
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