Give the following details about HBr total number of electrons: [electrons] name: [name] number of sigma bonds: [sigma] number of pi bonds: [pi]

The following graph shows the progression of a reaction between molecular hydrogen (H2) and molecular (I2) to produce hydrogen iodide (HI). Referencing the graph, answer the next seven questions.   See the description for details “This image depicts a graph showing the progression of a chemical reaction between molecular hydrogen (H2) and molecular iodine (I2) to form hydrogen iodide (HI). The red line represents the concentration of H2(reactant). The black line represents the concentration of I2 (reactant). The red dashed line represents the concentration of HI (product).The vertical line marked “”A”” is used as a reference for further questions regarding the concentration progression over time.”

H2S molecular shape: [shape] hybridization of the central atom [hybridization] common name or IUPAC name: [name] number of sigma bonds: [sigma] number of pi bonds: [pi]

There are three types of molecular motion that gas molecules possess. Which of the following types of molecular motion do gas molecules possess but liquids and solids do not?

Answer the following questions using the simplified solubility rules below: Cations that are always soluble: Compounds of group 1 cations (Na+, K+, etc.) and ammonium (NH4+) are always soluble. Anions that are always soluble: Nitrate (NO3−) anions are always soluble. Halides: Compounds of the halides (Cl−, Br−, I−) are soluble except for silver(I) (Ag+) and lead(II) (Pb2+). Sulfate: Compounds of sulfate (SO4 2−) are soluble except for group 2 cations (Ca2+, Sr2+, Ba2+) and lead(II) (Pb2+). Everything else: Most other compounds not listed as soluble in rules 1–4 are assumed to be insoluble.

The principal metals used for US coinage are elements 79, 47, 28, 29, and 30. Give the names, not the symbols, for these five elements and the name of the general group on the periodic table to which they all belong. Number Name 79 [79] 47 [47] 28 [28] 29 [29] 30 [30] General Group: [group]

Give the name and symbol for the radioactive noble gas having the greatest atomic mass or weight. Name: [name] Symbol: [symbol]

Michelangelo’s David statue is 18½ feet tall, including the base. Based on the fact that the density of marble stone is 160 lbs/cubic foot, a person could estimate that the statue weighs about 5,300. lbs, or 2,325 kg (1 kg is 1,000 g). Marble has a chemical formula of CaCO3 (calcium carbonate). In the 1750s, Joseph Black found that if calcium carbonate is heated to a temperature of over 825°C, it decomposes and releases “fixed air,” which is CO2, and produces lime (not the citrus fruit but a solid, white chemical compound). The chemical formula of lime is CaO. Write out a balanced equation for the reaction that shows CaCO3 (calcium carbonate) reacting to produce CaO (lime) and CO2 (carbon dioxide).  BYU-Approved David Statue Note: Show all work for this question for full credit. Label the question number clearly and circle or highlight all answers. You will upload your work at the end of the exam.

What type of light on the electromagnetic spectrum has the highest energy per photon? See the description for details The image shows a diagram of the electromagnetic spectrum, which represents the full range of electromagnetic radiation. It is divided into several regions based on wavelength and energy. On the left side, gamma rays have the highest energy and shortest wavelength, followed by X-rays and ultraviolet light. In the middle, the visible spectrum is shown, represented by a gradient of colors from violet to red, which corresponds to the light we can see. On the right side, waves like infrared, microwaves, and radio waves have progressively lower energy and longer wavelengths. Below the spectrum is a visual representation of a wave, illustrating the varying wavelengths of these different types of radiation.

What is the symbol of the element in group II and in row 4?