Indicate what error (small, large, or none) is introdu
what error (small, large, or none) is introduced into the percent iron in the unknown
and explain briefly why in each case.
a. if the permanganate solution contains some contaminant.
b. if h2so4 is not added to the solution.
c. if some iron unknown is spilled after weighing, but before titrating with kmno.

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.