2. What is the molar concentration of a solution of LiOH if 65 ml are titrated to an endpoint by 175 ml of a solution of HBr that is .025 M?

0.067 M

Explanation:

LiOH + HBB + H2O

1 mol    1 mol

M(LiOH)*V(LiOH) = M(HBr)*V(HBr)

M(LiOH)*65 mL = 0.025 M*175 mL

M(LiOH) = 0.025 M*175 mL/65 mL = 0.067 M

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 is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.