neon (Ne)‚ argon (Ar)‚ krypton (Kr)‚ xenon (Xe) and radon (Rn) ; are called "elemental gases". Alternatively they are sometimes known as "molecular gases" to distinguish them from molecules that are also chemical compounds. Etymology The word gas is a neologism first used by the early 17th-century Flemish chemist J.B. Van Helmont.[4] Van Helmont’s word appears to have been simply a phonetic transcription of the Greek word χάος Chaos – the g in Dutch being pronounced like ch in "loch" – in which
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Three things are usually required for a chemical explosion: a chemical reaction that occurs very rapidly‚ a large increase in gas pressure‚ and a confined-reaction vessel in which the pressure of the gaseous products can increase to a point that the gases break violently out of the container. In this chemistry and physics science fair project‚ you will use the combustion of ethanol to provide energy for a small explosion. The chemical equation that describes the combustion of ethanol is shown below
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I) INTRODUCTION * Industrial Chemistry deals with the preparation of products from raw materials through the agency of chemical change * Chemistry is important to Industry by: * Regulating manufacturing processes * Quality Control * Research and Development * Sources of raw materials from the natural environment 1) Lithosphere –Earth’s Crust 2) Hydrosphere – Marine and Oceanic Environment 3) Atmosphere – Air 4) Plants – Biosphere * Classification of Natural
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In other words‚ a mole of a 12 amu carbon atom will weigh 12 grams. The gram formula mass can be used as a conversion factor in stoichiometric calculations through the following equation: Moles = Converting between Volume of a Gas and Moles The Ideal Gas Law is PV = nRT ‚ with nrepresenting the number of moles. n = Mass to Moles Moles to Mass (same!) Atoms to Mass Divide by 6.022x10^23‚ then multiply by atomic mas To convert mass to atoms: Find the atomic mass of
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3: Problems & Answers Week 4: Feb 2- 6‚ 2009 1. Consider a gas that occupies 1.00 dm3 at a pressure of 2.00 bar. If the gas is compressed isothermally at constant external pressure‚ Pext‚ so that the final volume is 0.500 dm3‚ what is the smallest value Pext can have? Calculate the work involved using this value of Pext. Solution For compression to occur‚ the value of Pext must be at least as large as the final pressure of the gas. P1 = 2.00 bar‚ V1 = 1.00 dm3‚ V2 = 0.500 dm3‚ P2 = ? = 4
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it is to determine its molecular weight. In order to determine the molecular weight of a particular substance which in this experiment’s case is a volatile liquid‚ the need to convert the liquid into a gas arises. The relation among the pressure‚ volume‚ temperature and the number of moles of a gas will be an important key in the conclusion of its molecular weight. However‚ in the process of vaporization‚ there is a possibility that some of the vaporized liquid will escape the flask and will be replaced
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densities than liquids and solids. NO2 gas 4 Force Pressure = Area (force = mass x acceleration) Units of Pressure 1 pascal (Pa) = 1 N/m2 1 atm = 760 mmHg = 760 torr 1 atm = 101‚325 Pa Barometer For measuring atmospheric pressure 5 The force experienced by any area exposed to Earth’s atmosphere is equal to the weight of that column of air above it. 10 miles 0.2 atm 4 miles Sea level 0.5 atm 1 atm 6 Manometers Used to Measure Gas Pressures closed-tube open-tube Patm
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Fundamental of Engineering Calculation 1. Determine the following unit conversions to SI units: a. Density value of 60 lbft3 to kgm3‚ Ans: 961.1 kg/m3 b. Energy value of 1.7 ×103Btu to kJ‚ Ans: 1.8 x 103 kJ c. Enthalpy value of 2475 BtulbtokJkg‚ Ans: 5756 kJ/kg d. Pressure value of 14.69 psig to kPa‚ Ans: 201.88 kPa e. Viscosity value of 20 cp to Pa∙s‚ Ans: 2 x 10-2 Pa∙s Table of Conversion Factor 1 lb | 0.454 kg |
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types of chemical formulas? 1) atoms‚ ions‚ molecules 2) metals‚ nonmetals‚ metalloids 3) empirical‚ molecular‚ structural 4) synthesis‚ decomposition‚ neutralization 11. What is the total number of neon atoms contained in 20.2 grams of neon gas? 3) 3.01 × 1023 1) 1.01 × 1024 2) 2.02 × 1024 4) 6.02 × 1023 12. Given the balanced equation: X + Cl2 - C2H5Cl + HCl Which molecule is represented by X? 1) C2H4 2) C2H6 3) C3H6 4) C3H8 13. Which equation is correctly balanced? 3) 2 H2 +
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THIS FILE DOWNLOADED FROM THE IB NOTES SITE: http://ibnotes.tripod.com/ TOPIC 2— MECHANICS FOUNDATIONS: • • • Displacement— A measured distance in a given direction— tells us not only the distance of an object from a particular reference point‚ but also the direction from the reference point— is a vector. Velocity— Is speed in a given direction‚ and is also a vector. Acceleration— is the rate of change of velocity in a given direction (velocity/time). The unit in SI is metres per second
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