Lab 2 Report for MATSE 473 Determining Molecular Weight using Solution Viscosity Name: Mengfang Li Group D Lab Partners: Michael Lorenzo‚ Peter Mcclure 01/24/2012 Introduction: This lab was designed to demonstrate the method to measure the intrinsic viscosity of the prepared polystyrene. Intrinsic viscosity‚ which is measured from the flow time of a solution through a simple glass capillary‚ has considerable historical importance for establishing the very existence of polymer molecules
Premium Chemistry Water Mass
Determining the accuracy of varieties of pipettes by weighing and finding the density of a liquid Abstract Different varieties of pipettes (P100‚ PR1000 pipettors and a serological pipette) along with a weighing balance was used in this investigation to check the density of an unknown liquid by first finding out what the liquid weighed and plotting a graph of the mass in grams against the volume of the liquid used in micro litres (µl) and finding the gradient of the graph (∆Y/∆X). Most of the
Premium Density Kilogram Water
Validity Define Construct Validity and Explain and Illustrate three ways in which a researcher can determine whether a new psychological tests has construct validity. In addition briefly explain what is meant if a test is biased in terms of construct validity. Construct Validity • • • • • • • • • Construct Validity: extent to which a measure measures theoretical construct or trait Developmental changes: ▪ when tests should show change with age ▪ age differentiation
Premium Psychometrics
Name LESSON Date Class Reteach Developing Formulas for Circles and Regular Polygons Circumference and Area of Circles 9-2 A circle with diameter d and radius r has circumference C d or C 2 r. A circle with radius r has area A 2 r . Find the circumference of circle S in which A Step 1 Use the given area to solve for r. A 81 cm 2 2 81 cm . r2 r r2 r 2 Area of a circle Substitute 81 for A. Divide both sides by . Take the square root of both sides. cm 81 cm2 9 cm
Premium Regular polygon Circle
The Verification of the Molecular Formula and Percent Composition of the Compound Magnesium Oxide (MgO) Nice sounding title Date Performed Lab: 8/31/06 Purpose: The purpose of this lab was to confirm the chemical formula of magnesium oxide by comparing the masses of pure magnesium solid prior to any reaction and magnesium oxide solid after a reaction between all of the magnesium and oxygen from the air when heated from a Bunsen burner in a crucible. Using molar masses of both magnesium and
Premium Magnesium Oxide Magnesium oxide
Determining Your Perfect Position Paper LDR/531 May 18‚ 2013 Determining Your Perfect Position Paper By understanding leadership styles will help develop a person into being an effective leader. We will describe the author’s leadership style model and also look into the strengths and weaknesses of that model. Then compare and contrast leadership theories applicable to the author’s leadership approach. Leadership has different characteristics and behaviors then management Leadership Style
Premium Leadership Management Skill
Purpose: The purpose of this lab was to determine the freezing point of pure water‚ the experimental van’t Hoff factor for a substance and the molar mass of an unknown solution. Reagents: 25mL deionized Water ¼ to ½ inches of rock salt 25mL Sodium Nitrate (NaNO3 ) 25mL unknown solution – handle unknown solution carefully Procedure: For part 1‚ the freezing point of deionized water was determined. An ice bath was prepared by filling a 600mL beaker ¾ full of ice and covered with ¼ to
Premium Concentration Chemistry Water
Determining the Limiting Reactant and Percent Yield in a Precipitation Reaction Objectives: Observe the reaction between solutions of sodium carbonate and calcium chloride. Determine which of the reactants is the limiting reactant and which is the excess reactant. Determine the theoretical mass of precipitate that should form. Compare the actual mass with the theoretical mass of precipitate and calculate the percent yield. Materials: Balance 0.70 M sodium carbonate solution‚ Na2CO3(aq)
Premium
Research the nutritional composition of infant formula. Compare the nutritional composition of breast milk with infant formula. Food For Special Needs. Circumstances that lead to special food needs. Stages of the human lifecycle. Infancy: Is the stage in the lifecycle from birth to 12 months of age. Nutrition is important during this time‚ as rapid growth and development take place. After about 6 months of thriving on breast milk or formula milk‚ a baby may need some solid food for extra
Premium Nutrition Pregnancy Childbirth
I. Abstract: By manipulating the ideal gas law (PV=nRT)‚ we will be determining the molar mass of an unknown volatile liquid. Heating a flask filled with an unknown‚ easily evaporated liquid will allow for measurements that can be taken to work out the ideal gas equation. This lab will require knowledge of basic equations used in chemistry. Using these equations‚ such as density and number of moles(n)‚ we can substitute different values into the ideal gas law to manipulate it.
Premium