Concept explainers
You may have admired the beauty of hardwood floors. Polyurethane is the finish of choice for floors because it is more durable than varnishes and shellacs. Until recently, polyurethane was always an oil-based paint. But recently, the Bayer Corporation developed a water-based polyurethane that reduces the amount of VOCs by 50–90%. In 2000, Bayer was awarded a Presidential Green Chemistry Challenge award for this development. Prepare a summary of this work. Also check stores to see if any water-based polyurethanes are available in your area.
Want to see the full answer?
Check out a sample textbook solutionChapter 2 Solutions
Chemistry In Context
Additional Science Textbook Solutions
Elementary Principles of Chemical Processes, Binder Ready Version
Chemistry
General Chemistry: Atoms First
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition) - Standalone book
Organic Chemistry
- Marie Curie was born in Poland but studied and carried out her research in Paris. In 1903, she shared the Nobel Prize in Physics with H. Becquerel and her husband Pierre for their discovery of radioactivity. (In 1911 she received the Nobel Prize in Chemistry for the discovery of two new chemical elements, radium and polonium, the latter named for her homeland, Poland.) They and others observed that a radioactive substance could emit three types of radiation: alpha (), beta (), and gamma (). If the radiation from a radioactive source is passed between electrically charged plates, some particles are attached to the positive plate, some to the negative plate, and others feel no attraction. Which particles are positively charged, which are negatively charged, and which have no charge? Of the two charged particles, which has the most mass? Radioactivity. Alpha (), beta I(), and gamma () rays from a radioactive element are separated by passing them between electrically charged plates.arrow_forwardIs it acceptable to recycle the containers of hazardous chemicals? Why or why not? Explain your answer within the context of chemical safety.arrow_forwardWhat is Donnan's theory? What is its importance in biophysical chemistry?arrow_forward
- A concentration of carbon monoxide of 4000 ppm (0.400 % by mass) in air is lethal in about half an hour. What mass in grams of carbon monoxide in a car with an internal volume of 2.9 m3 is sufficient to provide that concentration? Assume the density of air is 1.29 g/L ; 1m3=1000L.arrow_forwardDust falls on Chicago at a rate of 65 mg m-2 day-1. Major metallic elements in the dust include aluminum, copper, lead, magnesium, manganese and zinc. Lead accumulates at a rate of 0.029 mg m-2 day-1. How many metric tons (1 metric ton = 1000 kg, an exact equality) of lead fall on the 535 km2 of Chicago in one year?arrow_forwardWhat is the practical importance of extraction in relation to chemistry especially when it comes to drugs?arrow_forward
- Oo.153. Subject :- Chemistryarrow_forwardThe noble gas argon was discovered by Sir Walter Ramsay and John William Strutt in England in 1895. Through this discovery, they made highly accurate measurements of gas densities. Their experimentally determined densities are: Oxygen 1.42952 g/L Nitrogen 1.25718 g/L Air 1.29327 g/L 1) To determine the density of atmospheric nitrogen, Strutt removed the oxygen, water, carbon dioxide, and argon from air and then filled an evacuated glass tube with the remaining gas. He determined that a mass of 0.20389 g of nitrogen has a density of 1.25718 g/L under standard conditions of temperature and pressure. What is the volume of the glass tube in cm3?arrow_forward3-4 sentences 1. Briefly state what separates science from opinion? 2. Water is the most important molecule to life on this planet. Briefly explain why water has the unique properties it does (high boiling point, high freezing point, high capacity of heat, etc.), especially for a small molecule. 3. How does the depth of water affect light availability? How deep does light penetrate ocean water? How might this affect ocean life? 4. The world oceans are dynamic. One reason is because the oceans are in constant motion. One means of water motion are waves. What are waves? What are three factors that affect wave height?arrow_forward
- A student dissolves 10.3g of ammonium nitrate NH4NO3 in 300.g of water in a well-insulated open cup. He then observes the temperature of the water fall from 22.0°C to 19.3°C over the course of 3.1 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NH4NO3s -> NH+4aq + NO−3aq You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy ΔHrxn per mole of NH4NO3.arrow_forwardIn a few lines, describe the IMMENENT IMPORTANCE of "Green Chemistry" and its importance to society ?arrow_forwardWhat is calibration and why is it essential in relation to food analysis? Provide examples.arrow_forward
- Chemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningChemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningIntroductory Chemistry: A FoundationChemistryISBN:9781285199030Author:Steven S. Zumdahl, Donald J. DeCostePublisher:Cengage Learning