What are the four major divisions of Earth's history. Explain how these divisions were made and why they
are useful.

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

Complete each row of the table below by filling in the missing prefix or missing exponent.