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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presence of fat. However in this experiment‚ not only are the milk tested for its composition‚ the amount of the particular substance such as reducing sugar‚ protein and fat is also tested by observing the intensity of the colour change. Milk is a white liquid produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals before they are able to digest other types of food. Early-lactation milk contains colostrum‚ which carries the mother ’s antibodies to the baby and
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INTRODUCTION. SOLIDS‚ LIQUIDS AND GASES have properties that are use to describe how they behave‚ e.g. for solids it has a definite shape‚ you can hold a solid rock in your hand. You can push on a solid brick wall. Scientists say a solid is something that has shape. A solid resists any change in its shape. TASKS 2. LOOK AT THE PICTURES BELOW FOR SOLID‚ LIQUID AND GAS AND WRITE DOWN THREE PROPERTIES OF EACH? Wood as a Solid. Solid has a fixed shape Its particles are tightly held together
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Vaporization Introduction: Evaporation is the process of a liquid becoming vaporized. When a liquid is placed into a confined space some of the liquids will evaporate. Evaporation of the liquid depends on the strength of the intermolecular forces that are between liquid molecules. During the evaporation process of the liquid‚ new gas molecules exerts pressure in the sealed container‚ while some of the gas condenses back to the liquid state. If the temperature inside the container is kept constant
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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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shape and volume. In a liquid‚ the particles have weaker attraction and are not as close to each other as solids. They can move around in all directions so liquid does not have a defined shape‚ but their movements are still limited by attractions between particles. Their movements are also limited by the walls of their containers‚ which is why liquids will take the shape of it’s container. Particles of gases are further apart from each other than particles in solids and liquids and their attraction
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Newtons. English (now American) system Feet‚ pounds (mass)‚ seconds‚ pounds (force) cgs system Density The density of a substance is defined as its mass divided by a unit volume ρ=M/V where ρ=density M=mass V=volume In the SI system the base unit for density is kg/m^3‚ whereas in the American engineering system density is commonly expressed as (lb_M)/(ft^3 ) (lb_M=pounds(mass)). Density of water SI system: 1 x 103kg/m3 = 1 g/cm3 American engineering system: 62.4 lbM/ft3.
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Filtration is commonly the mechanical or physical operation which is used for the separation of solids from fluids (liquids or gases) by interposing a medium through which only the fluid can pass. Oversize solids in the fluid are retained‚ but the separation is not complete; solids will be contaminated with some fluid and filtrate will contain fine particles (depending on the pore size and filter thickness). Filtration is also used to describe some biological processes‚ especially in water treatment and sewage
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CHLORIDE‚ SAND the wt. of mixture with evaporating dish after 1st heating is?? g. And after Its 2nd heating?? g. The method used to separate that mixtures are Filtration and Evaporation. Filtration is the process of separating the solid from the liquid by using a porous filter. And Evaporation is the process of reducing the volume of a solution. The substances that separated are the sand and the salt. What is the purpose of adding water to the residue (the solid particles that remained on the
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