26 26 CHEMISTRY UNIT 2 STRUCTURE OF ATOM The rich diversity of chemical behaviour of different elements can be traced to the differences in the internal structure of atoms of these elements. After studying this unit you will be able to • know about the discovery of electron‚ proton and neutron and their characteristics; • describe Thomson‚ Rutherford and Bohr atomic models; • understand the important features of the quantum mechanical model of atom; •
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Experiment A Spectroscopic determination of Iron with Phenanthroline Unknown # 2 Mass of Mohr’s Salt: 0.2040 1. 5mL of 6M acetic acid was measured and transferred into a 100mL volumetric flask with a pipette and diluted to the mark. Concentration = [0.2040(±0.0001)g/100(±0.08)mL]*[(1mol/392.16g)/(1L/1000mL)] = 0.005202(±0.09382%) = 0.005202(±0.000005)mol/L 2. 10mL of the above stock solution was transferred to a 250 mL volumetric flask and diluted to the mark. Concentration
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Resonating Air Column Expt. # 8‚ Physics 105‚ fall 2010 (reference only) Aim: To determine the speed of sound in air at room temperature using resonating air column (1). Apparatus: Resonance apparatus‚ four tuning forks‚ rubber mallet micrometer caliper‚ can of water and paper towels (1). Description of the apparatus: The apparatus consists of a 110 cm long uniform graduated glass tube of 1(1/2) diameter connected to a rubber tubing and a water
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Determination of Rate and Order of a Reaction Results This experiment used a spectrometer to find the wavelength with maximum absorbance in a green food coloring solution. For this particular solution the wavelength was 629.7 nm. The system was then calibrated to that and was set to measure the food coloring and bleach solution. The measured visible light absorbance of the mixed solution was collected over a time of 200 seconds and eight points were then selected and placed into the Absorbance
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LESSON ONE: Speed of light: C= 3 x 10^8 m/s‚ C=3x10^5 km/s Light year= dist= speed x time Earth rotates 360 deg every SIDEREAL DAY 1 Sidereal day= 24 sidereal hrs= 23:56 solar hours Earth revolves 360 around the sun ever 365.24 days= tropical year Earth’s rotation axis precesses every 26‚000 yrs Moon revolves 360 deg ever 27.3 days= Sidereal mon Moon’s cyc repeats every 29.5 days= Syndonic mon Saros cycle: one eclipse yr is only 346 days. 19 eclipse years= 223 syndonic months. LESSON ONE
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to their ground state and give off photons. 2.Is the flame test a qunatitative test or qualitative test for the identity of an unknown? This flame test is both quantitative and qualitative. It is quantitative because we are measuring the wavelength‚ and it is qualitative because we are making observations about the color and the chloride. Post-Lab Questions: 1.) What is happening inside of elements/compounds when they release color to the surroundings? Atoms of each element absorb energy
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the Beer’s plot by using the “eye-ball” method. Ocean Optics Spectrophotometric Block Diagram Source: Is a tungsten-halogen lamp‚ which emits radiation in the visible region (as well as the near the infrared and long wavelength end of the UV). Sample Holder: the sample holder that is also called the cuvette is a rectangular tube with two transparent faces. Pyrex glass or plastic cuvettes are transparent to visible light‚ but fused silica is needed for UV work. Fiber
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use of a spectrophotometer and a computer graphing program. A spectrophotometer was used to measure either the amount of light that passed through a solution (transmittance) of the amount of light absorbed by the solution (absorbance) at various wavelengths. The preparation of the extraction included the use of a scale to weigh samples‚ the operation of a pipette‚ and finally setting up and reading the results of the spectrophotometer.
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x-ray Introduction: X-radiation (composed of X-rays) is a form of electromagnetic radiation. X-rays have a wavelength in the range of 0.01 to 10 nanometers‚ corresponding to frequencies in the range 30 petahertz to 30 exahertz (3×1016 Hz to 3×1019 Hz) X-rays up to about 10 keV (10 to 0.10 nm wavelength) are classified as "soft" X-rays‚ and from about 10 to 120 keV (0.10 to 0.01 nm wavelength) as "hard" X-rays‚ due to their penetrating abilities.[3] Hard X-rays can penetrate some solids and liquids
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of lasers in order to be able to read current CD and DVD formats. The new standard‚ developed jointly in order to avoid competing standards‚ is also being touted as the replacement for writable DVDs The blue laser has a 405 nanometer (nm) wavelength that can focus more tightly than the red lasers used for writable DVD and as a consequence‚ write much more data in the same 12 centimeter space Like the rewritable DVD formats‚ Blu-ray uses phase change technology to enable repeated writing to
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