ANSWERS 391 ANSWERS Chapter 9 9.1 9.2 1.8 (a) From the given graph for a stress of 150 × 106 N m-2 the strain is 0.002 (b) Approximate yield strength of the material is 3 × 108 N m-2 9.3 (a) Material A (b) Strength of a material is determined by the amount of stress required to cause fracture: material A is stronger than material B. 9.4 9.5 9.6 9.7 9.8 9.9 9.10 9.11 9.12 9.13 9.14 9.15 9.16 (a) False (b) True 1.5 × 10-4 m (steel); 1.3 × 10-4 m (brass) Deflection
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________ Name: Loren B. Matulac Date : November 09‚ 2013 Yr. & Section: IV- Perseverance Teacher: Mrs. Pacita J. Yapsangco “Magnetic Field of a Coil” Experiment 2.5 I. Objectives: To produce a strong magnetic field just by looping the wire into coils II. Materials: 6 V or 9 V batteries 50 cm of bare 12- gauge copper wire Stiff cardboard and scissors Wooden dowel (about 15 cm long x 4 cm
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Topic 1.2 AMOUNT OF SUBSTANCE The mole Reacting masses and atom economy Solutions and titrations The ideal gas equation Empirical and molecular formulae Ionic equations Mill Hill County High School THE MOLE Since atoms are so small‚ any sensible laboratory quantity of substance must contain a huge number of atoms: 1 litre of water contains 3.3 x 1025 molecules. 1 gram of magnesium contains 2.5 x 1022 atoms. 100 cm3 of oxygen contains 2.5 x
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S53718/7 © UCLES 2004 [Turn over 2 Data speed of light in free space‚ permeability of free space‚ permittivity of free space‚ elementary charge‚ the Planck constant‚ unified atomic mass constant‚ rest mass of electron‚ rest mass of proton‚ molar gas constant‚ the Avogadro constant‚ the Boltzmann constant‚ gravitational constant‚ acceleration of free fall‚ c = 3.00 × 10 8 m s –1 0 0 =4 × 10 –7 H m–1 = 8.85 × 10 –12 F m–1 e = 1.60 × 10 –19 C h = 6.63 × 10 –34 J s u = 1.66 × 10 –27 kg
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release of white gas could be observed due to the reaction. The gas release caused animated fizzing. Temperature of boiling tube increases significantly‚ thus we can consider the reaction as being an exothermic reaction. Temperature gradually decreases. The solution is clear and colourless ‚ with no traces of the Mg strip. Data Processing: PV = nRT P; Pressure - Pa V; Volume - m3 n; Number of moles - moles R; Gas Constant - JK-1mol-1 T; Temperature - K Gas Constant (R) is
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was to determine if a there is a change in mass when a gas is produced and determine if gas has mass. To conduct this experiment‚ the group must be careful not to let the Alka-Seltzer tablet get wet before the bottle is closed by wiping the lip of the bottle and the cap so it remains dry‚ or risk gas escaping into the air and not being captured by the bottle. Also‚ the group must be sure to close the bottle tightly with the cap‚ because gas may escape this way as well. During this investigation‚
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Group No. Name: | Date Performed: | Course & Section: | Date Submitted: | Program & Year: | Professor: | Experiment 1 GASLAWS A. Combined Gas Law Temperature of Boiling Water in Kelvin (T1) | | Temperature of Cold Water in Kelvin (T2) | | Atmospheric Pressure in mm Hg (P1) | | Vapor Pressure of Water at T2 in mm Hg | | Final Pressure of Air in mm Hg (P2) | | Volume of Water Collected in the Flask in mL (Vwater) | | Initial Volume of Dry Air in mL (V1) |
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of the volume occupied by a gas is empty space. This accounts for the lower density of gases compared to liquids and solids‚ and the fact that gases are easily compressible.<br><br>b) The particles of a gas are in constant motion‚ moving rapidly in straight lines in all directions‚ and thus passes kinetic energy. The kinetic energy of particles overcomes
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for an ideal gas and carbon dioxide on the same axis. [2] 3. a. Use the ideal gas equation to calculate the number of moles of a gas which occupies a volume of 0.072dm3 at -480C and 3.4atm. R = 8.31JK-1mol-1 [5] b. If the mass of the gas above is 0.94g‚ calculate its relative molecular mass. [1] Kinetic Theory - Worksheet 4. A gas sample in the laboratory has a volume of 45.9 dm3 at 25.0oC and a pressure of 743Pa. If the temperature is increased to 155oC by compressing the gas to a new volume
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dioxide gas produced by the reaction is what causes the bubbling that can be observed. HCO3- (aq) + H+ (aq) → H2O (l) + CO2 (g) In this investigation‚ you will design two experiments which will compare two different factors that may affect the rate of the Alka-Seltzer reaction. Possible factors to be investigated include temperature‚ surface area‚ agitation‚ and amount of reactants. Remember to make sure there is only one independent variable in your experimental design for each experiment. You
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