Elements and molecules will always reemit the exact radiation that they
a. use
b. absorb
c. diffract
d. refract

What is a difference between a mixture of elements and a mixture of compounds

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ

Amethod of separation that employs a system with two phases of matter, a mobile phase and a stationary phase, is called