What is the de Broglie wavelength of a 11.8 g hummingbird flying at 115 mph? Be sure your answer has the correct number of significant digits. 1 mile 1.6093 km Note: Reference the Fundamental constants table for additional information. Note: Reference the Unit conversions for derived SI units table for additional information. cm x10

What is the de Broglie wavelength of a 11.8 g hummingbird flying at 115 mph? Be sure your answer has the correct number of significant digits. 1 mile 1.6093 km Note: Reference the Fundamental constants table for additional information. Note: Reference the Unit conversions for derived SI units table for additional information. cm x10

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter2: Atoms Molecules And Ions

Section2.8: Instrumental Analysis: Determining Compound Formulas

Problem 3.1ACP: To determine the density of atmospheric nitrogen. Lord Rayleigh removed the oxygen, water, and...

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You can analyze for a copper compound in water using an instrument called a spectrophotometer. [A spectrophotometer is a scientific instrument that measures the amount of light (of a given wavelength) that is absorbed by the solution] The amount of light absorbed at a given wavelength of light (A) depends directly on the mass of compound per liter of solution. To calibrate the spectrophotometer, you collect the following data: Plot the absorbance (A) against the mass of copper compound per liter (g/L), and find the slope (m) and intercept (b) (assuming that A is y and the amount in solution is x in the equation for a straight line, y = mx + b). What is the mass of copper compound in the solution in g/L and mg/mL when the absorbance is 0.635?
The density of an irregularly shaped object was determined as follows. The mass of the object was found to be 28.90 g 0.03 g. A graduated cylinder was partially filled with water. The reading of the level of the water was 6.4 cm3 0.1 cm3. The object was dropped in the cylinder, and the level of the water rose to 9.8 cm3 0.1 cm3. What is the density of the object with appropriate error limits? (See Appendix 1.5.)
Confronted with the box shown in the diagram, you wish to discover something about its internal workings. You have no tools and cannot open the box. You pull on rope B, and it moves rather freely. When you pull on rope A, rope C appears to be pulled slightly into the box. When you pull on rope C, rope A almost disappears into the box. a. Based on these observations, construct a model for the interior mechanism of the box. b. What further experiments could you do to refine your model?
The mass fraction of gold in seawater is 1 103 ppm. Earths oceans contain 3.5 1020 gal seawater. Estimate how many pounds of gold are in the oceans. 1 gal = 3.785 L; 1 lb = 454 g.
1. The inhabitants of a hypothetical exoplanet use a temperature system, called Pobius scale. The following equations relate their Pobius scale to our Fahrenheit scale. P = 2.5 F – 50 P + 50 F = %3D 2.5 Do the following conversions. 30°C = op a. 30°C to the Pobius temperature. Hint: First convert C to F, and then F to P -1050 °P = %3D b. -1050°P to Kelvin temperature. Hint: P to F; then F to C; then C to K
The mass of magnesium used in this experiment is critical to determining the moles of hydrogen gas generated. The analytical balances used in Chemistry 1A labs are very sensitive to point that touching materials with your fingers before measuring them can affect the measurements. The balances are sensitive enough to detect dirt and oils from your fingers transferred to the magnesium. Would your experimental value of R increase or decrease if the mass of magnesium measured was artificially high due the touching it with your hands? Increase Decrease
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The radio station 99.8 FM broadcasts at a frequency of 99.8 MHz (where 1 MHz = 106 Hz). What is the wavelength of the radio waves for this station, in meters? Show all work, including units, and give your answer to three significant figures.
A researcher would like to determine whether there is any relationship between students’ grades and where they choose to sit in the classroom. Specifically, the researcher suspects that the better students choose to sit in the front of the room. To test this hypothesis, the researcher asks her colleagues to help identify a sample of n = 100 students who all sit in the front row in at least one class. At the end of the semester, the grades are obtained for these students and the average grade point average is M = 3.25. For the same semester, the average grade point average for the entire college is μ = 2.95 with σ = 1.10. Use a two-tailed test with α = .01 to determine whether students who sit in the front of the classroom have significantly different grade point averages than other students.NOTICE that you are asked to use α = .01! A) sig., p<.01 B) N.S. ("not significant"), p>.01 C) sig., p>.01 D) N.S., p<.01
A student calibrated a eudiometer by first recording the mass of the empty eudiometer followed by filling the eudiometer to the 50.00 mL line with deionized water at 22°C and recorded the mass. The mass of water was 49.012 g. In an experiment run at 22°C, a reading from the eudiometer of 46.78 mL corresponds to what true volume?
An average human weighs about 650 N For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Force between two point charges. ▼ Part A If two such generic humans each carried 1.5 C coulomb of excess charge, one positive and one negative, how far apart would they have to be for the electric attraction between them to equal their 650 N weight? Express your answer in kilometers. ΠΡΑΣΦ T= Submit Request Answer Constants km