i This can be added to the graph by right clicking any point and selecting the

I this can be added to the graph by right clicking

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i. This can be added to the graph by right-clicking any point and selecting the “Add Trendline” option in Excel. e. After the best-fit straight line is produced, an equation for the line will be reported on the graph using the following generic formula: y = mx + b. f. The density of the material is the slope of the line indicated by the coefficient of x. g. If the equation is not available, to calculate the slope, two points that fall on the line will be selected and a calculation ofthe density will be the change in y over change in x via the formula: ∆y/∆x = (y 2 – y 1 )/ (x 2 – x 1 ). h. The value for the y-intercept, or the point where the line intersects the y- axis, should be zero. This is because when an object has zero volume it will also have no mass. i. If your y-intercept is not zero, then experimental error is apparent. 3) An example graph is shown below using data from table A. Procedure for Part 1: Density of Rubber Stoppers 1) Add 50 mL of distilled (or deionized) water to a 100.0 mL graduated cylinder. a. Measure the exact volume of water added by reading from the lowest point of the meniscus and record to the nearest tenth or first decimal place. 2) Place graduated cylinder onto a n analytical balance. a. Once a stable mass is displayed, tare the balance (or set the mass to zero). 3) Obtain a combination of 5 rubber stoppers that will easily fit into your cylinder. y = 4.215x -0.775 0 2 4 6 8 10 12 14 16 18 20 22 0 1 2 3 4 5 Cumulative Mass (g) Cumulative Volume Displaced (mL) Cumulative Mass Versus Cumulative Volume Displaced to Determine Density of Titanium Experimental Density of Metal Measurement of 50.0 mL 50 45 Experiment #1 Barnett
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7 4) Add one stopper at a time to the graduated cylinder and record the mass (or cumulative mass) of the stopper(s) between each addition , the total volume between each addition , and the volume of water displaced. a. Be careful not to splash out any of the water. b. Record the mass indicated on the balance using all decimal places provided. 5) Continue to add rubber stoppers (without removing the previous ones) and record the cumulative masses, total volumes, and volumes of water displaced. 6)Produce a graph of the cumulative mass versus the cumulative volumedisplacedusing a computerized graphing program. a.Compare the experimental/observed density to the true/theoretical densityand calculate a percent error.b.Percent error = [(true value – experimental value)/true value] * 100%i.Percent error cannot be a negative value. Take the absolute valueof the number if necessary.c.For the true/theoretical density, cite references for sources using properbibliographic technique. Procedure for Part 2: Density of Four Pure Metals 1) The four pure metals provided will be aluminum, copper, nickel, and zinc. 2) Place 12.00 mL of distilled (or deionized) water into a 25.00 mL graduated cylinder .
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  • Spring '19
  • Chemistry, Chemical reaction, Timothy Barnett

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