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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towel being used. | |Dependent variable |The dependent variable is the amount of water each brand of paper towel absorbed. | |Controlled variable |The liquid being absorbed (water) and the amount of water originally in the beaker are the controlled | | |variables. | Safety:
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solution C ABSTRACT Liquid C and solid C were both extracted from unknown solution by first using chemically active liquid-liquid extract‚ followed by vacuum filtration. Liquid C and solid C were then purified with the use of simple distillation and recrystallization respectively. Through the process of recrystallization‚ the percentage purity of solid C was found to be 6.01%. The melting point range of purified solid C was 117.0 – 119.0C while the boiling point of liquid C was found to be 117C
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to absorb liquids. It doesn’t matter if the sponge is from the sea‚ or from a factory‚ they both use wicking and surface tension in order to absorb sponges. This use is what allowed the sponge to soak its way into history. Sponge absorption is the key power that utilizes wicking and surface tension to soak up liquids. Wicking‚ or capillary action‚ allows water to be stored in sponges when they soak up liquids. According to World Book Student‚ capillary action is the movement of liquid in tiny holes
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medium lustre‚ malleable‚ ductile‚ opaque HCl – liquid‚ transparent‚ colourless‚ low viscosity‚ odourless Test tube felt warm bubbles 2 Burning splint placed near mouth of test tube Mg ribbon disappearing Liquid is still colourless and clear Bubbles still rising through liquid. “pop” sound when burning splint placed near mouth of test tube 3 Copper (II) sulfate (CuSO4) added to water CuSO4 – solid‚ blue‚ powder‚ odourless‚ opaque Water – liquid‚ colourless‚ transparent‚ low viscosity‚ odourless
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DETERMINATION OF BOILING POINTS Introduction: The boiling point of a compound is the temperature at which it changes from a liquid to a gas. This is a physical property often used to identify substances or to check the purity of the compound. It is difficult‚ though‚ to find a boiling point. Usually‚ chemists can only obtain a boiling range of a 2 - 3oC accuracy. This is usually sufficient for most uses of the boiling point. Purpose: The purpose of this experiment is to determine the
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cooling at aircraft cabin and also to rremove heat from electrical and electronic equipment. Its work on principle of cooling based on ability of refrigent to absorb heat when changing from liquid to gas. Once it turns to gas all the latent heat of vaporization it is compressed and condensed back into its liquid state. In other way vapour cycle system his also help to reduced the humidity of the air entering the cabin while aircraft on the ground and as the temperature of the air is reduced the moisture
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force in surface tension is cohesion and gravity. Surface Tension is the condition existing at the free surface of a liquid‚ resembling the properties of an elastic skin under tension. The tension is the result of intermolecular forces exerting an unbalanced inward pull on the individual surface molecules; this is reflected in the considerable curvature at those edges where the liquid is in contact with the wall of a vessel. Because of this property‚ certain insects can stand on the surface of water
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dropper’s density. When the density of the dropper increased‚ it became more dense than the water it was in‚ causing the dropper to sink. When pressure was released‚ the air was sucked back into the dropper making it less dense than the water again‚ so it floats back up to the top of the bottle.
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