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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Chem. 6C Midterm 1 Version A October 19‚ 2007 Name__________________________________________ Student Number _________________________________ All work must be shown on the exam for partial credit. Points will be taken off for incorrect or no units. Non graphing calculators and one hand written 3” × 5” note card are allowed. Problem 1 (of 15 possible) Problem 2 (of 26 possible) Problem 3 (of 20 possible) Problem 4 (of 15 possible) Problem 5 (of 6 possible) Problem 6
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OUTLINE 1. Intro- Chemical and biological weapons first appeared in a large quantity in the First World War. Chemical weapons‚ such as sarin‚ nerve gas‚ and mustard gas‚ have to be made in a laboratory. Biological weapons‚ such as Typhus‚ Q fever‚ and Anthrax‚ can be viruses or bacteria. Chemical and Biological weapons have few advantages and so many disadvantages that the advantages aren’t worth the possible effects. 2. Paragraph 1-advantages that can be turned into disadvantages a. Point 1-killing
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WATERY WORLD Water Usage in HICs Agriculture (39%) – use water to irrigate crops‚ using automated machines that use lots of water. Industry (47%) – Water is used in production and for cooling. Some use 1million litres a day Domestic (14%) – piped water supplies used for baths (150L) and washing machines (100L) other Water Usage in LICs Agriculture (91%) – Less efficient and require man power. Water is wasted in evaporation. Industry (5%) – There is less industry‚ more small cottage shops
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