What mass, in grams of O2 is needed to produce 155 g Fe2 O3? 4 Fe + 3 O2---> 4 Fe + 3 o2 --> 2 Fe2 O3

Which of the following ocean acidification? are the most likely side effects of a ph less than 7.0 in the ocean b. more metal salts altering the ocean chemistry c. dissolution of the shells of marine organisms d. both a & b e. all of the above.

An observation that requires measurement is called quantitative observable or qualitative

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6