Why is the increasing amount of carbon dioxide being taken up by the oceans a cause for concern?

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?