ch1 Student: _______________________________________________________________________________________ 1. xxWhich one of the following is a "substance" in the sense of the word as used in your textbook? A. B. C. D. E. air tap water sea water water toothpaste 2. Select the best statement. A. B. C. D. E. Physical changes may be reversed by changing the temperature. Physical changes alter the composition of the substances involved. Physical properties are not valid characteristics
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Determination of the tensile strength of starch bioplastic cast-film reinforced with Pineapple peel 1Caburnay‚ Frances Dianne R.‚ 1Contreras‚ Jonathan S.‚ 1D ulnuan‚ Gwen Kristin C 2Asst. Professor Catherine D. Sanchez 1Bachelor of Science in Food Technology 2Chemical Engineer ABSTRACT Natural fibers have become new alternative materials that can replace petroleum-based plastic‚ either alone or combined with another material‚ to produce greener composite materials. One of the most important
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Determination of the Waters of Crystallisation/ Water of Hydration‚ In Hydrated copper (II) Sulphate Introduction In nature there are some salts that will have water in their crystalline structure. These salts are commonly known as hydrated salts. Hydrated Copper (II) sulphate is one of these‚ as suggested by the use of the word hydrated in its name. Its molecular structure is shown below. The water that is chemically combined into their structure is called the water of crystallisation.
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Magnetic Field Strength Determination on a Solenoid and Magnetic Field Mapping on Bar Magnets Sims‚ Jon Xyrus College of Engineering‚ University of the Philippines‚ Diliman‚ Quezon City Abstract Magnetic fields are important in a vast array of applications‚ as well as its natural occurrence in many different phenomena. This experiment aims to determine the dependence of its strength on both a changing current‚ and for a solenoid‚ changing number of turns and determine through linear regression
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CHAPTER 3 TAX FORMULA AND TAX DETERMINATION; AN OVERVIEW OF PROPERTY TRANSACTIONS SOLUTIONS TO PROBLEM MATERIALS | | | | |Status: |Q/P | |Question/ |Learning | | |Present | in Prior | |Problem |Objective |Topic
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Introduction Why: The goal of this experiment is to determine the water hardness of the prepared unknown water sample. Determining water hardness is a useful test that measures the quality of water for its household and industrial users. Water’s hardness arises from the presence of metal ions – specifically metal ions with a charge of +2 or higher. The ‘scum’ left over in a cleaned shower stall or coffee pot is equivalent to water hardness. Water dissolves salts which contains ions of sodium‚ magnesium
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Determination of effect of different type of sun light on the germination Exp. No. 2 write a lab report Bio Lab 113 1/23/14 I. Purpose The purpose of this experiment is to see what affect light has on the germination of pinto beans. Introduction: Farming corps is the most important process for the survival of human race. The plants not only provide food for our bodies but it also helps provide the oxygen we breathe. They clean the air in a process called photosynthesis. This experiment
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Abstract: Ultraviolet (UV) radiation and its detrimental effects on plant life have been widely researched. This research studies the effects of UV radiation on sex-determination in Ceratopteris richardii. Sex determination in Ceratopteris richardii is determined by antheridiogen‚ a pheromone that promotes maleness. In this experiment‚ UV radiation was used on the wild type and mutants Her1‚ which are insensitive to the male-inducing pheromone (does not form male gametophytes). Ceratopteris richardii
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Abstract In this experiment‚ the Ksp for calcium sulfate dihydrate‚ CaSO4·2H2O‚ by titrating 4 times a calcium sulfate dihydrate solution with diprotic EDTA‚ H2(EDTA)2-. For each trial we found the Ksp by means of molarities and activities. The results for the Ksp using only molarities was very different than the Ksp using activities. The average Ksp using molarity only was 2.26 x 10-4 and the average Ksp using activity turned out to be 2.31 x 10-5. The actual Ksp however‚ is 3.14 x 10-5. A percent
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Objective In this experiment we would be ascertaining the percentage content of ethanol in 3 samples (spirit‚ wine and a beer). We would be comparing the concentration of ethanol to that of 25%propanol which would act as an internal standard. Method To set up the standards for a calibration curve we would make solutions of different concentrations of ethanol. Using a 25cm3 volumetric flask we would put 10cm3 of 25% Propanol into each one which would act as an internal standard. We would
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