1. Copper (__) is an element on the periodic table.
CU (both letters capitalized)
Cu (first letter capitalized)
cU (second letter capitalized)
cu (both letters lowercase)

 Cu

Explanation: It is Cu because the origin of the word Copper comes from the latin word "Cuprum".

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)

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error