Emission Spectroscopy Lab Introduction: According to the Bohr atomic model‚ electrons orbit the nucleus in fixed paths with specific energies. Each path is therefore often referred to as an “energy level”. Electrons possessing the lowest energy are found in the levels closest to the nucleus. Electrons of higher energy are located in progressively more distant energy levels. If an electron absorbs sufficient energy to bridge the “gap” between energy levels‚ the electron may jump to a higher
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Ashley Buss Chemistry Mrs. Hyde 9/27/13 Aspect 1: Our class conducted 3 experiments to demonstrate‚ investigate and experimentally verify the Atomic Laws of Dalton’s Atomic Theory. In our first experiment‚ we measured the mass of 2 objects and then added them and measured the combined mass. We did this to learn about the Conservation of Mass. In our second experiment‚ we took 2 packages of Oreos (regular/double stuf). We weighed the mass to determine the ratio. We did this to model the Law
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Test #2 ANSWERS CHM 101 Part I Multiple Choice (2 points each) 1. Which element is most likely to form three covalent bonds? A) C B) Si C) P D) S E) Se 2. A chemical bond formed when two atoms share two pairs of electrons is a ________ bond; it is best described as ________. A) double; covalent B) double; ionic C) single; covalent D) single; ionic E) triple; covalent 3. Which property could describe a covalent compound? A) It conducts electricity when melted. B) Has a low boiling
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1 Forms of Water 2 • Water consists of an Water is a Polar Molecule oxygen atom bound to -has oppositely charged two hydrogen atoms ends by two single covalent bonds. – Oxygen has unpaired & paired electrons which gives it a slightly negative charge while Hydrogen has no unpaired electrons and shares all others with Oxygen – Leaves molecule with positively and negative charged 3 ends Water molecules form Hydrogen bonds slightly positive charge hydrogen
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Chemistry 140A TOTAL POSSIBLE: 250 Fall‚ 2009 POINTS MISSED: - 0 Second Midterm Exam-250 points 11/19/09 TOTAL: 250 DO NOT OPEN THIS EXAM UNTIL INSTRUCTED TO DO SO.....FILL OUT THE FOLLOWING INFORMATION NOW: . LAST NAME (Print): KEY FIRST NAME (Print): Ima PID: __________________________________________________ SIGNATURE: __________________________________________
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NAME: I. SIGNIFICANT FIGURES Determine the correct number of sig fig 1. 0.0001002300 2. 3‚039‚401‚000 3. 6.00 4. 8.0003 5. 6‚793 6. 3.040 x 103 7. 400.00 8. 0.000000000890 9. 10‚600 10. 0.5009 Express the answer for the given mathematical operation in correct sig fig 11. log(8.9790 x 1021) 12. antilog(0.1) 13. 0.34589 + 0.30 14. (1.310 x 102) x 0.350 15. 0.040500 / 0.030 II. REDOX REACTIONS Balance the following redox reactions and indicate which chemical species is the oxidizing agent and the
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11.5 Transcription Regulation in Eukaryotes Basal level - Low level of transcription Activators - Gene specific transcription factors Enhancers - Regulatory sequences that augment transcription Silencers - Regulatory sequences that diminish transcription Initiator - RNA polymerase II - Promoter‚ together with TATA (TFIID) *Looping enhances transcription Transcription-coupled Repair (TCR) - DNA repair mechanism Response Elements - Enhancers that respond to metabolic
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CHEM RESEARCH TASK 1. INDICATORS Identify and describe some everyday uses of indicators including the testing of soil acidity/basicity. • Indicators are used regularly in chemical laboratories during chemical reactions. One important use is to determine the end point of a titration when an acid reacts with an alkali. The reactants and products of such a reaction are colourless so an indicator is a useful way to visually determine when the reaction is complete. Chemists also need to monitor
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and there is no tax shield. Cost of debt after the tax change ranges between 3.39% to 7.44%. Lastly‚ for other issue knows today is 12 years after the case‚ and DC is still in business. CONCLUSION As we know‚ prior to the 1990s‚ the Deluxe Corporation (DC)‚ the world’s largest printer of checks as well as a provider of electronic products and services to financial institutions and retail
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Alpha Corporation Question 1) Assumption: Only transactions above 50 millions are considered as major transactions. a) 1989: i. Sources of Cash: Net cash provided by continuing operations‚ Proceeds from disposal of depreciable and other assets‚ Increase in short-term borrowings‚ Proceeds from long-term debt. ii. Uses of Cash: Investment in depreciable assets‚ Investment in capitalized software‚ Payments of long-term debt. b) 1990: i. Sources of Cash: Net Cash
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