rubber was needed for tyres of military vehicles and the supply was interrupted by the conflict between the countries. Scientists in Germany and the US developed synthetic polymers that could replace rubber. Even after the war ended the traditional sources of natural rubber could not meet the greatly increased demand‚ so synthetic rubbers dominated the market. Natural rubber [poly-cis-isoprene(C5H8)n]. the latex consists of a polymer colloid of a monomer called isoprene. The precipitation of the rubber
Premium Sodium Sodium chloride Sodium hydroxide
that someone else would do it. After all‚ you don’t know him so it’s really none of your business. This is what is referred to as "bystander apathy". People close enough to see‚ hear and possibly touch one another are socially distant and totally indifferent to the fact that another human being may be dying‚ in immediate danger‚ or asking for help. This extremely sad urban problem is just that- a problem of cities. The likelihood of this occurring increases with the number of people present and it
Premium Bystander effect Kitty Genovese
Finding the Activation Energy of the reaction between Hydrochloric Acid and Sodium Thiosulfate The equation for the reaction is: S2O32- (aq) + 2H+(aq) ⋄ SO2 (g) + S(s) + H2O (l) Equipment - 2 boiling tubes - 400 cm3 beakers - Marker pen - Stand and clamp - Timer - Bunsen burner‚ tripod and gauze - 0 – 100 oC thermometer - 2 x 10 cm3 measuring cylinders - Access to a fume cupboard. Method 1. Label two boiling tubes A and B. Mark a dark spot on the side of a 400cm3 beaker‚ then ½ fill
Premium Temperature Measurement Energy
How could graphics and/or statistics be used to misrepresent data? Where have you seen this done? Statistics‚ graphics‚ and database are used in medical field to approve‚ prove‚ or disapprove theories‚ analysis‚ and interpretation of ailments‚ medication and it’s impact‚ and treatment and it’s effectiveness. However‚ these data can be easily misinterpreted when and where there is a vested interest. Individual opinions are generalized without considering whole aspects of the issue‚ thus forming a
Premium Statistics Sampling Scientific method
PRE-LAB REPORT Lab: Density of Liquids and Solids Purpose of the experiment: The purpose of this lab is to help understand how to resolve the density of liquids and solids. Also‚ the lab is supposed to teach us how to record lab data and how to measure volume and mass the correct way. Lastly‚ it’s designed to help us understand significant values and its relationship to measurements and data recording. Lab Techniques: One technique that will be used during this lab is comparing the accuracy
Premium Density Volume
Stoichiometry with Sodium Salts of Carbonic Acid Introduction- This experiment is intended to help find a better understanding of chemical stoichiometry through titrations of NaHCO3 and NA2CO3 with HCl. A chemical reaction is a process that involves rearrangement of the molecular or ionic structure of a substance‚ as opposed to a change in physical form in a nuclear reaction. Titration is when a measured amount of solution of unknown volume is added to a known volume of a second solution until the reaction
Premium Hydrochloric acid Sodium carbonate Chlorine
Many can argue that immigration density in our population has reached its peak over the past decade. And many are right. A survey conducted in 2013 by the U.S. Census Bureau showed that about 13% of our massive 316 million U.S. resident population are foreign-born and have immigrated here from a different country. That’s roughly 1 in every 7 people‚ so it’s needless to say that America makes up the world’s most diverse ethnic stew. Everywhere from the hot and sunny lands of Mexico to the humid and
Premium Immigration to the United States Immigration Unemployment
and t-Pentyl Chloride | | Jessica | [Pick the date] | Abstract The synthesis of the alkyl halide n-Butyl Bromide from alcohol is the foundation for the experiment. During the isolation of the n-butyl bromide‚ the crude product is washed with sulfuric acid‚ water‚ and sodium bicarbonate to remove any remaining acid or n-butyl alcohol. The primary alkyl halide halide n-butyl bromide is prepared by allowing n-butyl alcohol to react with sodium bromide and sulfuric acid. The sodium bromide reacts
Premium Chromatography Carbon Sulfuric acid
Substance Volume the amount of space an object takes up cm3 mL Measuring Volume Directly Calculating Volume by Formula Water Displacement Method for Small‚ Irregularly Shaped Objects Water Displacement Method for Large‚ Irregularly Shaped Objects Density Mass the amount of matter in a given space g/cm3 g/m L D=M/V amount of matter in an object Matter-is anything in the universe that has mass and takes space Triple Beam Balance-measures the mass of an object Finding Mass Directly 1. Zero out
Premium Mass Density Volume
Effects of Population Density and Noise Pollution University of Phoenix PSY 460 Dr. Michael Mckellip The Effects of Population Density and Noise The term population density is described as a measurement of the number of people in an area. It is calculated by dividing the number of people by area. As of the last U.S. census‚ the average population density of the United States was 87.4 people per square mile (US Census Bureau‚ 2010). This is just an objective
Premium United States Census Bureau Psychology Population