I did a 360 degree room scan, slowly, to show that there is nobody in the room and that I don’t have any other devices around me.  If you did not do a room scan, do it now and come back to complete this question.

For questions 21–24, use your scratch paper to workout the problems. Upload a file or image of your scratch paper in question 24. You may use your phone to take a picture of the paper and upload to the exam. Ensure your paper is clearly labeled with the question and answer. You will not given credit if the question or answer is unclear. Questions 21–24 are worth 20 points each.

The systematic name of this chemical compound P4S7 is .

El apartamento de Sara y Julio. In addition to the description Sara posted about the apartment, she included a couple of photos of the apartment. Complete the tasks based on the images of the rooms.    Room 1                                                                                                Room 2  A. ¿Cómo es el apartamento? Which rooms of the apartment did Sara share on her post? Select from the dropdown menu which rooms are pictured here. (1 pt. each; 2 pts. total) 1. Room 1 = [1] 2. Room 2 = [2]   B. ¿Qué muebles hay en el apartamento? What furniture and accessories are pictured on the images? For each item labeled with a number on the images, select the appropriate vocabulary term from the dropdown menu. (1 pt. each; 8 pts. total) 1. Item 1 = [3] 2. Item 2 = [4] 3. Item 3 = [5] 4. Item 4 = [6] 5. Item 5 = [7] 6. Item 6 = [8] 7. Item 7 = [9] 8. Item 8 = [10]  

Please complete a 360 degree room scan, slowly, to show that there is nobody in the room and that there aren’t any other devices around.  If you do not complete a room scan you will automatically earn a score of 0 (zero) for the exam.

A high-energy physicist measures the time between collisions of atoms in a fluid. The time is 21fs. What is the time in seconds using scientific notation.

What is the wavelength of an electron in meters traveling at 4.11 × 106 m/s? (Use the resting electron mass from the physical constants table.)

Solid aluminum (Al) and chlorine gas (Cl2) react to form solid aluminum chloride. Suppose you have 2.0 mol of Al and 1.0 mol of Cl2 in a reactor. What would be the limiting reactant?

Which of the following regarding protons, neutrons, and electrons are true? 

Calculate the molecular mass nickel(Ⅱ) nitrite in amu (atomic mass unit), keeping 5 significant figures. The atomic mass for Ni is 58.6934 amu, N is 14.00643 amu, and O is 15.9994 amu.