Cheyenne Kenny September 29‚ 2014. Biology Properties Of Water Adhesion How does temperature change affect surface tension? As the temperature of a liquid increases‚ its surface tension decreases. When water heats up‚ the movement of its molecules disrupts the imbalanced forces on the surface of the water and weakens its sheet-like barrier of tightly bound molecules‚ thereby lowering the surface tension. This is why hot water is more effective when cleaning; its low surface
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radiation. "Conduction is heat transfer by direct molecular interactions‚ without mass movement of matter" (Convection‚ Conduction‚ and Radiation). "Convection is heat transfer by mass movement" (Convection). "When molecules of a liquid vaporize‚ they escape from the liquid into the atmosphere" (Evaporation). This is the definition of evaporation. Radiation are Electromagnetic waves that directly transport ENERGY through
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The instrument was wiped down and then place in the carrying case. * The temperature of the first drilling fluid (water) was noted down * The mud cup got filled up with the drilling fluid and covered. It got wiped down due to the overflowing liquid from the sides and the opening on the lid. This overflowing shows that the trapped gas/air bubbles‚ if any‚ have been expelled
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Abstract-Timur Solid phase extraction is a sample preparation technique that overperform liquid /liquid extraction in its efficiency‚ labor intensity and waste disposal. The purpose of this lab is to learn how SPE can be used to identify trace amounts of Vanillin. Stock solution of vanillin in water with concentration of 50 ppm was prepared. Four solutions with concentration of 5 ppm‚ 1 ppm‚ 0.5 ppm and 0.1 ppm were made from stock solution. UV-Vis spectra of standard solution was recorded at 229
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Lab #1: Melting Points of Organic Compounds Report Form May 15‚ 2014 1. A “Melting Point Range” refers to the range of temperature at which a solid melts into its liquid state. 2. Pure compounds have narrow or ‘sharp’ melting point ranges‚ 1°C or less if the compound is very pure. A less pure compound exhibits a broader melting point range‚ between 3°C to 10°C as well as a depressed or lower range. 3. Crushing the sample allows for greater surface area-to-volume ratio of the powder‚ this
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You can separate solutions into two categories‚ colligative properties and non-Colligative properties. Colligative properties are different from non-colligative properties because they focus on the dissolved particles‚ not the solute itself. Non-colligative properties depend on the specification of the dissolved particles and the solvent. Colligative properties are properties that depend on the dissolved solutes in the solution. There are four main colligative properties; vapor pressure‚ freezing
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Experiment :12 Vapor Pressure and the Heat of Vaporization Nicole Petersen TA: Ryan Dixon 4/16/2013 Purpose: Use experimental techniques to record temperature and volume data for known and unknown compounds. The liquid and gas are going to be at equilibrium. We will also determine the boiling point for the known and unknown. Then use a graph to calculate the slope and then use Clasius- Clapeyron equation to find the heat vaporization. Procedure: Refer to pages 155-167 of Chemistry 1210 General
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How are crystals grown? You have created a supersaturated solution by first heating a saturated sugar solution and then allowing it to cool. A supersaturated solution is unstable; it contains more solute than can stay in a liquid form‚ so the sugar (the solute) will come out of solution. Then evaporation occurs as time passes‚ the water will evaporate slowly from the solution. As the water evaporates‚ the solution becomes more saturated and sugar molecules will continue to
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filtration) Organic layer Unknown (By Evaporation) Procedure and Observation: 0.30093 g of panacetin was weighed and mixed well with 50 ml of dichloromethane. After stirring the solution thoroughly‚ some solid is formed (solid sucrose) and liquid. With using a preweighed filter paper to filter the mixture‚ and after the sucrose had dried‚ it was weighed out to 0.7756g. For the aqueous layer‚ adding 10ml of 6M HCl(pH 2) and filtered using vacuum filtration and after cooled in the ice bath.
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naturally occurring element that is found in air‚ water and soil. It exists in several forms: elemental or metallic mercury‚ inorganic mercury compounds‚ and organic mercury compounds. It is a shiny metal‚ silver-white color‚ volatile and odorless liquid metal. The exposure to mercury can affect and harm human health‚ environmental and wildlife. How is mercury released into the environment? Mercury can be released into the environment through leaks and spills of the medical devices like thermometers
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