Which chemical equation is balanced? a. co2 + 4h2 -> ch4 + 2h2o b. 4co2 + h2 -> ch4 + 2h2o c. co2 + 4h2 -> 2ch4 + 2h2o d. 2co2 + 2h2 -> 2ch4 + 2h2o

The rock in a lead ore deposit contains 89 % pbs by mass. how many kilograms of the rock must be processed to obtain 1.5 kg of pb?

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

How would you reduce the volume of gas