When you measured out one ml of the trans-1,2-dibenzoylethylene in ethyl acetate solution it had a mass of 0.890 grams. (0.050 g of yellow solidand rest of it is ethyl acetate). the forerun of ethyl acetate had a mass of 0.075g and the rest of the ethyl acetate collected had a mass of 0.253 g. the trans-1,2-dibenzoylethylene had a mass of 0.046 g. what is the percent recovery of each of the materials?
if the ethyl acetate collected in the forerun had a refractive index of 1.3715 at 24.5 c, what is the corrected value for 20 c?
3. i. the ir spectrum of trans-1,2-dibenzoylethylene has a strong peak near 1680 cm-1. to what stretching frequency could this peak correspond?

ii. similarly, ethyl acetate shows a strong signal at 1730 cm-1. to what stretching frequency could this peak correspond?

iii. explain why the c=o signal in trans-1,2-dibenzoylethylene appears at lower frequency than that

of ethyl acetate.

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation:

idk i’m struggling too

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).