Essays Tagged: "Solvent"

Process manufacturing tecnology.

ble health properties of chloroform it was substituted by dichloromethane. Reaction times with this solvent were extended and it was subsequently replaced by an excess of Liquid A.The dissolution of S ...

(15 pages) 180 1 3.0 Aug/2003

Subjects: Science Essays > Engineering > Manufacturing Engineering

The properties and biological importance's of water to living organisms

100C. Water is also very good at ionizing substances due to its structure, and is therefore a good solvent. These properties, and many others, will be considered by looking at the main areas in whic ... the hydrogen atom.The polar nature of the water molecule is the reason that water is such a good solvent,as it can easily ionize substances. Water has been called the 'universal solvent',as m ...

(6 pages) 50 0 4.6 Feb/2004

Subjects: Science Essays > Biology

Photosynthesis and Chromatography

the tube, a dot of green was dabbed onto the different papers 1 cm above the tip and dipped into a solvent-filled centrifuge tube. Each paper was dipped into one of three solvents. The variable was c ...

(3 pages) 63 0 4.0 Feb/2004

Subjects: Science Essays > Biology > Plant Biology

How Does Hydrochloric Acid Affect The Time Of Magnesium to Dissolve?

ion of dissolved reactants (that is how much of the reactant is dissolved in a particular volume of solvent): reactions are faster at higher concentrations, and slower when the concentration is lowere ... ion of dissolved reactants (that is how much of the reactant is dissolved in a particular volume of solvent): reactions are faster at higher concentrations, and slower when the concentration is lowere ...

(6 pages) 54 1 3.5 Apr/2004

Subjects: Science Essays > Biology

CHROMATOGRAPHY

dish, stapler, sand, spatula, pipette, capillary tube, Whatman filter paper, a 50 ml chromatography solvent, and goggles (to be worn at all times). The steps to performing the experiment were:1. ... at all times). The steps to performing the experiment were:1. Pour 50 ml of chromatography solvent into the tall jar and cover it with half of the petri dish.2. Take ½ teaspoon ...

(2 pages) 44 0 3.0 May/2004

Subjects: Science Essays > Biology > Plant Biology

Could the Great Depression be describes a time of desperation?

sinesses closed down due to bankruptcy or reduced their output or employee numbers in order to stay solvent in the unstable economic atmosphere. However, there were individual businesses and even enti ...

(2 pages) 20 0 3.0 Oct/2004

Subjects: History Term Papers

Water Potential of a Potato.

r is 0 (kPa) and any water movement is measured with a negative value.When a solute is mixed with a solvent the water potential will decrease, and will always be a negative value.Solute Potential.As t ...

(6 pages) 21 0 3.0 Oct/2005

Subjects: Science Essays > Biology

Water.

t of the other substances.The hydrogen bonding is also responsible for the specific density and its solvent properties.

(1 pages) 503 1 1.7 Nov/2005

Subjects: Science Essays > Biology

Biology Lab Report on the extraction of Chlorophyl from Plant Leaves

Stripes of this solution were put on a filter paper and later, after dried placed into a beacon of solvent. After this the chloroplast pigments were separated by the solvent into groups of more or le ... ed to be able to identify the four different pigments types of a leaf. As the filter paper with the solvent will separate the pigments in terms of solubility, a clear segmentation of each is expected ...

(3 pages) 50 0 3.0 Mar/2006

Subjects: Science Essays > Biology > Plant Biology

The Importance of Water in Living Organisms

ms and slightly positively charged hydrogen atoms making it polar.Water has been called a universal solvent because of it polarity. This means it can easily ionise substances. Many compounds, whether ... ce while in solution with water. Often in organisms substances must be in solution and water is the solvent. Plants can only obtain mineral salts in solution and human digestion will only dissolve sol ...

(3 pages) 13 0 2.3 Jun/2006

Subjects: Science Essays > Biology

The Importance of Water in Living Organisms

ms and slightly positively charged hydrogen atoms making it polar.Water has been called a universal solvent because of it polarity. This means it can easily ionise substances, Many compounds, whether ... ce while in solution with water. Often in organisms substances must be in solution and water is the solvent. Plants can only obtain mineral salts in solution and human digestion will only dissolve sol ...

(3 pages) 18 0 4.6 Jul/2006

Subjects: Science Essays > Biology

Precipitation Reactions

e phase, and sinks to the bottom of the solution (though it will float if it is less dense than the solvent, or form a suspension).This effect is useful in many industrial and scientific applications ...

(2 pages) 19 0 3.0 Aug/2006

Subjects: Science Essays > Chemistry

Experiment write up, including method and discussion on testing food substances for the presence of lipids (fats)

, i.e. seeds, will contain lipids.Introduction:Lipids are insoluble in water but soluble in organic solvents. Ethanol is an example of an organic polar solvent which will dissolve lipids to a limited ... hanol emulsion test. This is because some of the lipids dissolved into the ethanol as it is a polar solvent. The hydrocarbon tails on lipid molecules are strongly hydrophobic. When the ethanol and lip ...

(9 pages) 36 0 3.0 Oct/2006

Subjects: Science Essays > Biochemistry

Ibuprofen Resolution

lizes first an enantiomerically enriched mixture of ibuprofen. This enriched mixture dissolves in a solvent and solid racemic ibuprofen is separated, leaving a mother liquor comprising, the solvent an ... profen can be obtained by dissolving an enantiomerically enriched racemic mixture of ibuprofen in a solvent. Any solvent that is not reactive with ibuprofen and dissolves substantially all of the mixt ...

(3 pages) 12 1 3.0 Feb/2007

Subjects: Science Essays > Chemistry

Serial Dilutions

starting point. A measured amount of sample is transferred to another well and mixed with dilution solvent, creating a lower concentration. For example, if 10 micro liters of sample is mixed with 90 ... g a lower concentration. For example, if 10 micro liters of sample is mixed with 90 micro liters of solvent, the resulting liquid will be 10% as concentrated. This is called a 1:10 dilution. Frequentl ...

(4 pages) 34 0 5.0 Jun/2007

Subjects: Science Essays > Biology

Aldol Synthesis of Dibenzalacetone

, the reaction would not go to completion and less yield can be expected. It might be caused by the solvent used during recrystallization was a little bit more than advised in the lab manual (~15 mL i ... eyond recrystallizing at this point; but it recrystallized as it cools down, so I was sure that the solvent used was not too much. The crystal was also wasted in the Erlenmeyer flask and some on the f ...

(3 pages) 28 0 4.0 Jul/2008

Subjects: Science Essays > Chemistry

Dehydration

cer by 50% and it can potentially even reduce the risk of breast cancer (Unknown).Water serves as a solvent for nutrients and delivers nutrients to cells; while it also helps the body eliminate waste ...

(3 pages) 50 0 5.0 Sep/2008

Subjects: Businesss Research Papers > Management

Lab report for chromatography,international baccalaureate programme

ase refer to the handoutDATA COLLECTION: Coloured bandPigment front distance (± 0.05cm)Solvent front distance (± 0.05cm)Green11.713.0Yellow12.513.0DATA PROCESSI ... er than chlorophyll a. Since it is lighter, chlorophyll b can cause more rise of the chromatography solvent in the microscopic spaces between the fibres of the chromatographic strip. So, this techniqu ...

(2 pages) 15 0 0.0 Nov/2008

Subjects: Science Essays > Biology

Esterification

uid with a distinctive odor. At room temperature it is a polar liquid and is used as an antifreeze, solvent, and fuel. Compound B was found to be phthalic acid. Phthalic acid is used mainly in the for ...

(6 pages) 3875 0 0.0 Oct/2009

Subjects: Science Essays > Chemistry

Determination of Copper by Complexation, Solvent–Extraction and Spectrophotometry

Determination of Copper by Complexation, Solvent-Extraction and SpectrophotometryAbstractTo determine the concentration of copper in an unkno ... stractTo determine the concentration of copper in an unknown solution by using copper complexation, solvent extraction and spectrophotometry. Standards are used to create a calibration curve and the u ... ution such as colourimetric titration, microwave digestions and spectrophotometry however using the solvent-extraction provides the most accurate measurements of solvent and using the spectrophotometr ...

(10 pages) 0 0 0.0 Oct/2012

Subjects: Science Essays > Chemistry