3 Mar7 ch 1

2. Students measured and recorded the mass of a rock four times. The true mass of the rock is known to be 3.25 grams. Complete the table and determine the average (mean), the deviations from the mean, the deviations squared, the standard deviation, and percent error. Trial # Mass (g) Deviation Deviation squared 3.22 2 3.21 3. 3.20 4 3.21 Standard Deviation Average (mean) Absolute Error Percent Error

Determine mass of cube. Record mass in Lab Data.

Data Table 1. Mass of Pipetted Samples of Water (The first one is done for you. Sample Density (g/mL) mL Sample Mass (g) 1.00 0.99 g D = mass/volume = 0.99 g/1.00 mL = 0.99 g/mL 3.00 2.98 g /3.00 mL = 2.98 g 4.00 3.99 g /4.00 mL = 3.99 g 5.00 5.01 g 5.01 g /5.00 mL = 9.89 g 9.89 g/ 10.00 mL = 10.00

Two sets of measurements generate the following values for the concentration of Ca²+. Average Standard Deviation Measurement Set 1 140.55 ppm 8 ppm Measurement Set 2 137.72 ppm 18.453 ppm The concentration is known to be 139.6 ppm. State which Measurement Set is more precise and which is more accurate. Clearly explain your reasoning.

Pellets of a certain substance are found to weigh 18.75 g. A volume of 13.5 mL of water is added to a graduated cylinder, followed by the pellets. The volume is observed to rise to 14.5 mL. Use Table I below to identify the substance. Table l.  Densities of Selected Solids (at 20 oC)  Material                  g/cm3 Material                  g/cm3 Magnesium            1.7 Zinc                         7.1 Silicon                     2.3 Steel                        7.8 Glass Beads            2.6 Nickel                      8.9 Aluminum               2.7 Gold                         19 Titanium                 4.5 Platinum                   21   Question 4 options:   Glass Beads   Silicon   Titanium   Zinc   Aluminum   Steel   Nickel   Magnesium   Gold   Platinum

Please answer question number 2  correctly with the correct answer. there is a picture of an example of a ''Dimensional analysis Format' below. please write out all work showing the math in dimensional analysis format. (please show all work)   Question 3: What is the molar mass of each of the following compounds?   A. C6H12O6   B. NaHCO3

(number 15, for the second picture)

1. 23.78 hg = kg 2. 3423 L= cL %3D 3. 9.643 Mm m 4. 34,000,234 nm dm 5. 10.753 us = S 6. 9.65 kg = 7. 5.37 cm^3 = g mL 8. 19.88 km nm 9. 5397.8 mL cm^3 10. 763.79 cm^3 = L

A small amount of resin weighing 4.56g occupies a height of a 10-mL graduated cylinder equivalent to one mL. One mL of water was added and the level was read at 1.7 mL. Estimate the density of the resin. * Mark only one oval. 6.5 g/mL 2.68 g/mL 4.56 g/mL 15.2 g/mL 0000

Two methods were used to measure the arsenic level (ppb) in drinking water. Quantity Method I Method II Mean arsenic concentration (ppb) Standard deviation (ppb) Number of measurements 1.382 0.025 1.346 0.039 4 4 F calculated=? Are the standard deviations significantly different? I calculated=? Are the means significantly different?

Suppose some measurements are made on two different homogeneous stones to find out if they are made of the same kind of rock. The mass and volume measurements are listed below. Are the two stones the same type of rock? Why or why not? Show all calculations. Mass Volume Calculations Stone 1 58.0 g 20.0 cm Stone 2 50.1 g 15.0 cm3 21/common/assets/pdfjs/1.0.0.30/web/viewer.ht...ndered-pdf&fullscreen=Dd21-fileviewer-rendered-pdf-dialog&height=746#0

How to do the graph base on these results.

Pls pls help me with this question I can’t seem to find the right answer. Pls make sure your answer is 100%% pls and thank you

Part 3: Calculate density of a metal an unknown metal. 1. Using the pictures below, record the displayed data in the data table in the report sheet. Make sure to include the right number of significant figures in the measurements and calculations. Mass measurement 7.1 g Volume of water measurement. There's only one measurement here – the larger image is for magnification only. -20 15 m Volume of water and metal measurement. There's only one measurement here – the larger image is for magnification only. 20 m 15

The number of hectograms (hg) in 3.95 x 104 cg is           .     3.95 hg     0.03950 hg     39.5 hg     0.000395 hg     39,500,000 hg

Chapter 1 hw

A class of chemistry students measured the density of an unknown liquid. If the correct density of the sample is 1.14 g/mL, what is the percent error for their average experimental density? Group Density (g/mL) 1 1.033 1.185 1.075 4 1.026 1.135 1.022 %E = 94.6% %3D %E = 5.4% %3D %E = 6.1% %E = 5.7%

I have attached a photo of what I need help with below. It is helping with finding total area and volume of 4 spheres. Thank you

How do you solve this? I dont know where to start.   Manganese makes up 1.3 × 10 –4 percent by mass of the elements found in a normal healthy body. How many grams of manganese would be found in the body of a person weighing 274 lb? (2.205 lb = 1 kg)   a. 0.79 g   b. 79 g   c. 1.6 × 10–4 g   d. 0.16 g   e. 16 g

how can i plot this data for concentration with depth?