13. (3 points) Draw a 3D Lewis structure (use wedge and dash…
13. (3 points) Draw a 3D Lewis structure (use wedge and dash bonds) for CH2S. Be sure to include any formal charges or lone pairs. WCSP[x] a. (2 points) Determine the electron domain geometry about the carbon. __________________________ b. (2 points) Is CH2S polar? Explain in just a few words. Enter the number of lone pair electrons in the box below.
Read Details8. Write the balanced chemical reaction for limestone (CaCO…
8. Write the balanced chemical reaction for limestone (CaCO3) reacting with acid rain (H2SO4). Include the phases (s, l, g, aq). (WCSP[x], 4 points) Enter the coefficients for each reactant and product in the box below (no spaces)
Read Details14. A phase diagram for a substance with a molar mass of 60….
14. A phase diagram for a substance with a molar mass of 60.1 g/mol is shown below. (WCSP[x]) a. (6 points) Sketch the heating curve for the substance going from -30 °C to 150 °C (point A to point B on the diagram above). A template is given below. b. (6 points) Calculate the heat required to vaporize 30 g of the substance initially at room temperature (25 ºC). (WCSP[x]) ΔHfus 5.4 kJ/mol ΔHvap 45.1 kJ/mol Cs (solid) 2.45 J/g°C Cs (liquid) 2.26 J/g°C Cs (gas) 2.05 J/g°C Melting point -89.5 °C Boiling point 82.6 °C Enter the value in the box below.
Read Details6. You have likely heard of the weed killer Round Up. It i…
6. You have likely heard of the weed killer Round Up. It is a solution of glyphosate in water. To prepare a solution for application, you need to do a dilution of the concentrate so that the final concentration of glyphosate is 0.45 M (equivalent to a 5% glyphosate). Calculate the volume of 2.8 M Round Up concentrate needed to make 1 gallon (3.875 L) of 0.45 M weed killer for yard and garden application. (WCSP[x], 6 points) Enter the value in the box below.
Read Details4. (WCSP24.[x], 8 points) Cell phones use electromagnetic r…
4. (WCSP24.[x], 8 points) Cell phones use electromagnetic radiation with an energy of about 1.08 J/mol of photons. Calculate the wavelength (in nm) and frequency that can be used to describe light with this energy. Enter the wavelength in nm below.
Read Details16. Carbon monoxide is a toxic gas. The upper limit of carb…
16. Carbon monoxide is a toxic gas. The upper limit of carbon monoxide (CO) in air is 9 ppm (9.0 x 10-6) over an 8-hour period. a. At this concentration, how many moles of CO are there in a bedroom with a volume of 29,000 L at 25 oC and 0.98 atm? (3 points, WCSP[x]) b. How many molecules of CO are in the room? (3 points, WCSP[x]) Enter the value from part a in the box below.
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