Why is doing research if you're creating the procedure for an experiment?
a. someone else may have results you can copy for yourself.
b. it can you avoid problems with your experiment not working.
c. research lets you know if your hypothesis is correct ahead of time.
d. online sources will tell you what your independent variable should be.

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