Ben Quinones AP Chem Mr. Perry 25 January 2013 Molar Mass by Freezing Point Depression Conclusion: My Lab unsuccessfully found the molar mass of the unknown given to us in the lab. We were tasked with finding the molar mass of an unknown compound using the colligative property of Freezing Point Depression. The way we did this was first finding the temperature at which ice crystals form for just regular BHT. Luckily thanks to our TA we were given temperature probes so we could pinpoint exact
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EDUCATIONAL TESTING SERVICE‚ ETS‚ the ETS logos‚ GRADUATE RECORD EXAMINATIONS‚ and GRE are registered trademarks of Educational Testing Service. CHEMISTRY TEST PRACTICE BOOK 007625 • 54082 • ETS/ GRE Practicing to Take the CHEMISTRY Test • RI51620 • OC 5/9/0 • revs 5/17/01 rkc • revs 6/25/01 rKc* • revs 7/23/01 las Table of Contents Purpose of the GRE Subject Tests ........................ 3 Development of the Subject Tests ....................... 3 Content of the Chemistry Test ..........
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Exercise 7.3 (Solutions) MathCity.org Calculus and Analytic Geometry‚ MATHEMATICS 12 Merging man and maths Available online @ http://www.mathcity.org‚ Version: 1.0.0 Question # 1 ˆ j ˆ (i) u = 3i + ˆ − k ‚ ˆ j ˆ v = 2i − ˆ + k u = (3)2 + (1) 2 + (−1)2 = 9 + 1 + 1 = 11 v = (2) 2 + (−1)2 + (1)2 = 4 + 1 + 1 = 6 ˆ j ˆ u ⋅ v = 3iˆ + ˆ − k ⋅ 2i − ˆ + k j ˆ ( )( ) = (3)(2) + (1)(−1) + (−1)(1) = 6 − 1 − 1 = 4 u ⋅ v = u v cosθ Now ⇒ cosθ = u⋅v u v 4
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A3: Table 2: OC B1: V1+W2= 5‚ W2 = 5 B2: V2+W2= 8‚ V2 = 3 C2: V2+W3= 4‚ W3 = 1 A3: V3+W1= 3‚ W1 = 0 C3: V3+W3= 4‚ V3 = 3 VC CC A1: 3 – 0 – 0 = 3 150 + 40 + 100 + 60 + 20 C1: 3 – 0 – 0 = 3 = 370 A2: 4 – 3 – 0 = 1 B3: 8 – 3 – 5 = 0 2) OC A1: V1+W1 = 30‚ W1 = 30 A2: V2+W1 = 30‚ V2 = 0 B2: V2+W2 = 50‚ W2 = 50 B3: V3+W2 = 60‚ V3 = 10 VC B1: 30 – 0 – 50 = -20 A3: 40 – 10 – 30 = 0 B1: - 30 30 30 - 50 Table 2: OC A1: V1+W1= 30‚ W1 =
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ZnSO4(aq) If an excess of zinc powder is added to 50 cm3 of 1.0 moldm-3 copper(II) sulphate‚ the temperature increases by 6.3 oC. Calculate the enthalpy change for the reaction. 2. Magnesium will also displace copper from copper (II) sulphate solution. If an excess of magnesium is added to 100 cm3 of 1.0 moldm-3 copper(II) sulphate‚ the temperature increases by 46.3 oC. a) Calculate the molar enthalpy change for the reaction b) Calculate the minimum quantity of magnesium required to ensure
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Anthony Young Partner: Nick Dale TA: Alekhya 6/15/15 The SN2 Reaction: Factors Affecting SN2 Reaction. Introduction In the substitution reactions‚ the leaving group from the substrate is replaced with the nucleophile. Because of the nucleophile it is called nucleophilic substitution. The lone pair of electrons‚ present on the nucleophile is used to create a new bond with the carbon atom‚ from which the leaving group was separated. There are two different mechanisms of nucleophilic substitution: SN1
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process used to make the determination. What statistical procedures are mentioned in the study? Descriptive statistics used prior to analysis. The 2500 heterosexual women participants with one biological child‚ 1‚000 were using oral contraception (OC) and 1500 used no form of hormonal contraception (Jaslow‚ 2011). In the original study‚ random sampling method implemented using an online survey. The sample included women from Canada‚ the United States of America (USA)‚ Czech Republic/Slovakia‚ United
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The Development of Risk Management in the GCC Oil and Gas Sector Dr. Faisal Al-Thani November 9‚ 2008 0 Contents Why Risk Management is important National Oil Company case study N ti l C t d The Risk Management model Conclusion C l i 1 Characteristics of Oil and gas Industry Oil and gas industry is prone to uncertainty – – – – – – Oil reserve uncertainty Exploration uncertainty Crude price uncertainty Product price uncertainty Demand uncertainty Supply uncertainty Oil and
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Calculation Process: The rate of respiration is calculated by dividing the distance that the drop of dye moved over 5 (period of time). For example‚ at 19 OC‚ the distance that the drop has moved after 5 minutes for the 3 trials are respectively 0.19‚ 0.10 and 0.13. The rate of trial 1 is then calculated by dividing 0.19 over 5‚ which is 0.0380 (shown above). For average rate of respiration‚ it is calculated by adding up all 3 trials of the same temperature and dividing the sum by 3. Additionally
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call it in English? What type of help? Offer of help. OC 30 sec S – Listening 30 secs OC - 2 +(3)=4 3. To clarify the form of the TL Target language = Can I do anything for you? Can I help? Modal verb + Pronoun + Verb Stress on verb Infection at the end T- write form sentences on board T – where is the stress T - Analyse the language. OC - 3 +(3)=7 4. To isolate
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