Numerade

Triple a A.

Books Assigned

Organic Chemistry

John McMurry 8th Edition

1,282 solutions

Analytical Chemistry

David Harvey 1st Edition

1,303 solutions

Modern analytical chemistry

David T Harvey 1st Edition

1,347 solutions

Viewed Questions

Look at Figure 30.1 , and tell which molecular orbital is the HOMO and which is the LUMO for both ground and excited states of ethylene and 1,3 -butadiene.

The concentration of $\mathrm{NO}_{3}^{-}$ in a water sample is determined by a onepoint standard addition using a $\mathrm{NO}_{3}^{-}$ ion-selective electrode. A 25.00 mL sample is placed in a beaker and a potential of $0.102 \mathrm{~V}$ is measured. A $1.00-\mathrm{mL}$ aliquot of a $200.0-\mathrm{mg} / \mathrm{L}$ standard solution of $\mathrm{NO}_{3}^{-}$ is added, after which the potential is $0.089 \mathrm{~V}$. Report the $\mathrm{mg} \mathrm{NO}_{3}^{-} / \mathrm{L}$ in the water sample.

The concentration of $\mathrm{NO}_3{ }^{-}$in a water sample is determined by a one-point standard addition using an $\mathrm{NO}_3^{-}$ion-selective electrode. A $25.00-\mathrm{mL}$ sample is placed in a beaker, and a potential of $+0.102 \mathrm{~V}$ is measured. A $1.00-\mathrm{mL}$ aliquot of a $200.0 \mathrm{ppm}$ standard solution of $\mathrm{NO}_3^{-}$is added, after which the potential is found to be $+0.089 \mathrm{~V}$. Report the concentration of $\mathrm{NO}_3^{-}$in parts per million.

Two sequential pericyclic reactions are involved in the following furan synthesis. Identify them, and propose a mechanism for the transformation. (FIGURE CANNOT COPY)

Questions asked

INSTANT ANSWER

Three different monatomic cubic crystals powder specimens are analysed with Debye Scherrer camera. It is known that one is face-centered cubic, one is body-centered cubic, and one has the diamond structure. The approximate positions (2θ values) of the first four diffraction maxima in each case are; A, B, C Identify the crystal structures of A, B, C

INSTANT ANSWER

Metallic iron at 20oC is studied by the bragg method, in which the crystal is oriented so that a reflection is obtained from the planes parallel to the sides of the cubic crystal, then from the planes cutting diagonally through the edges, and finally from planes cutting through the corners. Reflections are first obtained at Ɵ = 11o 36; 8o3; and 20o26; respectively. What type of cubic lattive does iron have at 20oC?

ANSWERED

Breanna Ollech

Numerade educator

Calculate the density of Zinc blende (ZnS). (Ionic radii: Zn2+ = 0.060 nm and S2- = 0.174 nm. The relationship between the lattice constant and radius are [ ]. The inside large spheres represent zinc (A=65.41 g/mol) atoms and the smaller ones, the sulfur (A=32.06 g/mol) atoms.