General Chemistry I Dr. Judith Albrecht Introduction Attendance: – mandatory for exams and lecture – absence in the exams leads to fall the class Goal of this course: – critical thinking and problem solving by yourself • responsible for your own learning process • studying continuously and independently is the key to success – active memorization – study groups (!!!) – ask questions Introduction 1.Introduction: Matter and Measurement 2.Atoms‚ Molecules‚ and Ions 3.Stoichiometry 4.Aqueous Reactions
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multiplied by a power of 10 and must be between 1 and 10. Significant figures: The number of digits you quote when you write down the value of a quantity that has been measured with a degree of uncertainty. The smaller the number of significant figures quoted for a value‚ the smaller the uncertainty in that value. The significant figure is the number(s) that carry meaning to that particular range of digits. So in the figure 247300‚ the most significant number is 2 as it tells us the number is 2 thousand
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How many significant figures should we take for the answer? The relative uncertainty of each numbers = 45.0118 x = 4.50 ‚ 45.0118 (2 sig. figures) ‚ Addition and subtraction 5.74 + 0.823 + 2.651 = 9.214 How many significant figures should we take for the answer? 5.74 + 0.823 + 2.651 9.214 9.21 (2 decimal places) Logarithms and antilogarithms • In a logarithm of a number‚ keep as many digits to the right of the decimal point as there are significant figures
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The Lab Report‚ Significant Figures & Working with Numbers CHMY 142-18 Experiment 1 September 4th‚ 2009 Introduction: This experiment is dealing with the relative accuracy of an individual measurement. Data will be provided to perform the calculations asked for. The purpose of this experiment is to know how to use significant figures and to get formularized with making proper laboratory reports. Procedure: Use the data table’s information to solve the missing
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Differences in Sociolinguistic Rules and the Misunderstandings Language learners are used to taking advantages of knowledge of their mother tongue language when they are studying foreign languages‚ they may have some misinterpretations that caused by the differences in sociolinguistic rules. For a better understanding of sociolinguistics‚ Wardhaugh (2006‚ p.13) stated that sociolinguistics how people’s talking are influenced by the society and how people’s class‚ gender‚ and age contribute to
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01.07 Accuracy and Precision: Balance Lab Worksheet Calculations Show all of your work for each of the following calculations and be careful to follow significant figure rules in each calculation. 1. Part I: Density of Unknown Liquid 1. Calculate the mass of the liquid for each trial. (Subtract the mass of the empty graduated cylinder from the mass of the graduated cylinder with liquid.) Trial 1 36 - 25.5 = 10.5 Trial 2 36.5 - 25.5 = 11 Trial 3 36.9 - 25.5 = 11.4 2. Calculate the
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costs 6.90 $. Whats the cost per bag when you include shipping? The total purchase is 6 bags plus shipping‚ 6(8.95 $) + 6.90 $ = 60.60 $ Dividing by the number of bags gives 10.10 $ per bag. 7. Express the following with appropriate units and significant figures: (a) 1.0 m plus 1 mm‚ (b) 1.0 m times 1 mm‚ (c) 1.0 m minus 999 mm‚ (d) 1.0 m divided by 999 mm. a) To the least-precise decimal place‚ we have 1.0 m + 1 × 10−3 m = 1.0 m b) The least-precise factor‚ 1 m‚ has one
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to tutorial 2 question 2. Present all values of an ‚ bn and pn in full precision‚ and values of f (pn ) and the relative error bounds to 4 significant figures. For questions 2 and 3‚ tabulate all your workings as in the answer to tutorial 2 question 3. Give the values of all fixed-point iterates to 8 decimal places‚ and values of |pn − pn−1 | to 4 significant figures. 2. Consider f (x) = x2 − 5 sin(x). (i) Sketch the graph of f (x) to locate the roots of f (x) = 0. Write down an interval [a‚ b]
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generations are going to make this far worse than what it is already is because of how intrusive technology has become on their everyday lives. Relationships are a big deal when it comes to texting. Since now days it is difficult to see and call your significant other constantly through out the day‚ texting has become such a convenience to keep in touch with each other and maintain a healthy relationship even when you aren’t together. How ever
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Vibration- Rotation Spectroscopy of HCl and DCl Purpose: To determine the fundamental vibration frequency and bond length for H35Cl‚ H37Cl‚ D35Cl‚ and D37Cl and to compare the isotope effects to theoretically predicted values. Introduction Vibration spectroscopy is one of the most important tools for the accurate determination of molecular structure. Vibration spectroscopy also plays an important role in environmental chemistry. For example‚ the albedo of the earth’s atmosphere is controlled by the
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