Objective: To determine the relationship between the pressure and volume of a gas at constant temperature. Introduction: The relationship of pressure to volume for a gas in a rigid container was first described in 1662 by the Irishborn scientist Sir Robert Boyle (16271691)‚ and is known as Boyle’s Law. As long as the temperature of the gas remains constant‚ the pressure of a gas has a predictable relationship with the volume of the gas. The pressure of a gas is a measure of
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atoms or molecules The gas particles are in constant random motion Kinetic energy is transferred between particles as they collide Pressure The force exerted per unit of area Formula: pressure/force area Measured by barometer A vacuum is empty space‚ with no particles or pressure. Atmospheric pressure is the collision air particles with objects Units of pressure Kilopascals (kPa) Atmospheres (atm) Millimeters of mercury (mmHg) Temperature What happens to the motion of gas molecules if the
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point of pure water in the data table. Letting the water boil will decrease the mass of the water present in the calorimeter. Note that the boiling point may be different than 100°C if the atmospheric pressure is not 760 Torr. The current atmospheric pressure for the day can be checked by selecting Pressure on the LED meter on the wall. 5. Drag the weigh paper to the calorimeter and add the NaCl. Wait 30 seconds for the salt to dissolve and then turn on the heater. When steam first appears
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message: (561-542-5608) Calculations: 1. Write the balanced equation for the reaction conducted in this lab‚ including appropriate phase symbols. Mg(s) + 2HCl(aq) --> H2(g) + MgCl2(aq) 2. Determine the partial pressure of the hydrogen gas collected in the gas collection tube. The partial pressure of the hydrogen gas is 1.07 atm 3. Calculate the moles of hydrogen gas collected. pv=mrt ; n= .0013mol of hydrogen gas 4. If magnesium was the limiting reactant in this lab‚ calculate the theoretical yield
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liquid hydrogen‚ –252.87°C (b) the temperature of a room at 20°C. 2. A constant-volume gas thermometer is calibrated in dry ice (–80.0°C) and in boiling ethyl alcohol (78.0°C). The respective pressures are 0.900 atm and 1.635 atm. (a) What value of absolute zero does the calibration yield? (b) What pressures would be found at the freezing and boiling points of water? (Note that we have the linear relationship P = A + BTc‚ where A and B are constants.) 3. The melting point of gold is 1 064°C‚ and
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experimentally determine the Universal Gas Constant “R”. Amedeo Avogadro hypothesized that all gases of equal volume‚ temperature and pressure would contain equal amounts of moles. This idea that volume is directly proportional to moles sprung from other similar hypotheses. Robert Boyle found that pressure and volume are inversely proportional‚ meaning as pressure increases‚ volume decreases and visa versa. P1V1=P2V2
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or true value of whatever is measured. Precision - The measure of how close a series of measurements are to one another. Matter – anything that takes up space and has mass. Standard temperature and pressure = 0° Celsius at 1 atmosphere of pressure. Atmosphere is a unit for measuring pressure Avogadro’s number = 6.02 x 1023 volume of 1 mol of any gas at STP = 22.4 L Ion- atoms or groups of atoms that have a positive or negative charge Anion- negatively charged ion Cation- positively
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CENTRIFUGAL PUMP DEMONSTRATION UNIT (CH3132 - Energy Efficiency and Conservation) INSTRUCTED BY : Mr. M.A. THARANGA NAME INDEX NO GROUP DATE OF PER DATE OF SUB : T.R.MUHANDIRAMGE : 090334 H :E : 2012-03-30 : 2012-04-24 RESULTS AND DISCUSSION Exercise 1 :-Understanding the basic characteristic curves of a centrifugal pump. 1. Total head against the flow rate At 70% At 50% 2. Mechanical power changes with the flow rate At 70% At 50% 3. Pump efficiency against the flow rate
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motion & frequent collision Effusion: escape of gas from a container to a region of vacuum Gas Pressure P= Force/area Force: Newton or kg x m/s2 Pressure: Pascal or N/m2 Standard atm pressure P= hdg H: height‚ d: density; g: 9.80665 m/s2 1 atm* = 101‚325 Pa = 760 mmHg* = 760 torr* = 1.01325 bar = 14.7 psi barometer: measure atmospheric pressure Monometer: measure pressures other then atm pressure Gas Laws Boyles law: P at constatnt T is iversely prop to V P1V1=P2V2 EX:Calculate the volume
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the volume of the thoracic cavity‚ and the intercostal muscles contract‚ which makes the rib cage move upward and forward increasing the volume of the lungs. The increase in pressure inside the lungs makes the air from the atmosphere move into the lungs because air always moves from an area of high pressure to a low pressure area. During expiration‚ the intercostal muscles that lift the rib cage and the diaphragm relax. As a result‚ the rib cage and the diaphragm return to their original positions
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