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@@cbcbbbc- Ob¤¤¤¤¤¤¤ ECH Your Aktiv Learning trial expires on 09/20/22 at 11:59 PM Question 4 of 20 The following picture would be best described as W A) a liquid mixture B) a gaseous mixture C) a liquid compound D) a gaseous compound E) a solid compound 84°F Sunny

The ammonia molecule (NH₂) has a dipole moment of 5.0 x 10-30C-m. Ammonia molecules in the gas phase are placed in a uniform electric field with magnitude 1.2x10° N/C. Part A What is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to from parallel to perpendicular? Express your answer using two significant figures. ΑΣΦ AU = Submit Part B T= Submit Request Answer Provide Feedback At what absolute temperature T is the average translational kinetic energy KT of a molecule equal to the change in potential energy calculated in part (a)? (Note: Above this temperature, thermal agitation prevents the dipoles from aligning with the electric field.) Express your answer using two significant figures. |VD ΑΣΦ P ? Request Answer J X ? Review Constants K Next >

1.19 The lattice constant of a single crystal is 4.73 Å. Calculate the surface density (#/cm²) of atoms on the (i) (100), (ii) (110), and (iii) (111) plane for a (a) simple cubic, (b) body-centered cubic, and (c) face-centered cubic lattice.

(4) Find the Fermi energy of lithium EF, the Fermi temperature TF, and the speed of vF of the fastest free electrons.

v ints. That is, choose 1 next to the substance with the highest boiling Rank the elements or compounds in the table (Choose one) point, choose 2 next to the substance with th 1 (highest) chemical symbol, substance chemical formula or Lewis structure H : 4 (lowest) H C C N C H (Choose one) A H. H H :NEN 0: (Choose one) В H :0: H. |I . I (Choose one) C Н—С — С - О- С — Н .. H H. F2 (Choose one)

MISSED THIS? Read Sections 4.2 (Pages 141 - 145), 4.5 (Pages 155 - 158) ; Watch KCV 4.2, IWE 4.2. Part A When iron rusts, solid iron reacts with gaseous oxygen to form solid iron(II) oxide. Enter a balanced chemical equation for this reaction. Express your answer as a chemical equation. Identify all of the phases in your answer. • View Available Hint(s) ΑΣφ ? OA chemical reaction does not occur for this question.

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In order to avoid the possibility of 2-hour delays this winter, EKU will be stockpiling de-icing salts to help keep the roads and sidewalks clear. Facility Services has been quoted the following prices:  K2SO4: $5.35/kg MgSO4: $4.55/kg Which salt provides a better value? Support your answer with a calculation.

In your own words, describe why metals are such good conductors of electricity. Be sure to include the definition of metallic bond in your answer. Answer in 2 to 3 complete sentences. I !!! H Normal A Enter your answer here BIUS √x 20 Tx