John Brown tried to help enslaved people in Kansas by

stopping à violent uprising.
urging plantation owners to revolt.
attacking proslavery settlers.
urging proslavery settlers to move.

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)

the ratio of the conjugate base to the acid required to attain the desired ph.

може ли да зареждате повече информация, моля