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[DOC File]Lab #4: Identification of an Unknown Hydrate of Copper (II ...
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Perform calculations and determine the formula of the substance CuSO4(nH2O. Observations/Data: Table 1: Results. Description Value A Mass of empty evaporating dish B Mass of dish with unknown hydrate C Mass of unknown hydrate (B-A) D Mass of dish after first heating E Mass of unknown hydrate after first heating (D-A) F
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[DOC File]Sampling and Sample Size
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The formula can be rewritten as: N = (zα S / E ) 2 . where E is the “margin of error” (half the width, W). As an approximation, for 95% confidence, use the value of 2 for zα (instead of 1.96) – remember that this is an approximation, after all! Then the formula is a very concise and easily remembered: N = (2S / E ) 2
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[DOC File]Percent Composition and Empirical Formula
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The formula of calcium carbonate, for example, is CaCO3. The empirical formula gives the ratio of atoms in a compound and does not necessarily represent the actual number of atoms in a molecule or formula unit. It is possible, in fact, for many different compounds to share the same empirical formula.
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[DOC File]Percentages: The most useful statistics ever invented
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Just google “dimension research calculator”, click on the first entry that comes up, and click on “sample size for proportion” on the left-hand-side menu . Then select a confidence interval, enter your “best-guess” P and your tolerable ½ W, click the Calculate button, and Shazam! ... which is more complicated than for the standard ...
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[DOC File]IB Mathematical Studies Yr 1 – Unit Plans
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- Show the students how to solve these equations on their calculator (either graphically or using the solver). - The word problems here for our students are really difficult so numerous examples are a good idea. - The quadratic formula is optional but some students find the …
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[DOC File]Quick method for estimating the margin of error
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Use the sample proportion p from a simple random sample of size n to estimate an unknown population proportion p. The margin of error for 95% confidence is roughly ...
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[DOCX File]Chapter 23) Technique-22, Evidence Based on Measurements ...
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Topic 1.) Technique 22) Evidence B ased o n M easurements, and Estimates of Magnitude Technique-22, measurements, and estimates based on magnitude, include all of the following, based on the way the terminology is used in this topic:
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[DOC File]Analysis of Hydrate
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Chemical formula of Alum is KAl(SO4)2 •12H2O which indicated that there are 12 mol of water attached to 1 mol of KAl(SO4)2. First, let’s calculate the molar mass of Alum, then the theoretical % of water in Alum, KAl(SO4)2 •12H2O can be calculated easily:
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[DOC File]Estimation
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The actual percentage of the sample with that characteristic This is given on your calculator with the variable p-hat. You could easily find this yourself with the formula
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[DOC File]CALCULATION OF REPEATABILITY AND REPRODUCIBILITY
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Expectation of e is assumed to be 0 and its variance, the within laboratory variance, is assumed to be equal in all laboratories and is denoted as repeatability variance r2. Repeatability standard deviation r and reproducibility standard deviation R are defined as formula eq.2 and eq.3. (2) (3)
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Percentage error formula calculator