6. Radioisotope A has a half-life of 2 minutes. Radioisotope B has a half-life of 2
hours. Which one would have a larger amount left after 5 hours has elapsed?

Which of the following is a compound? a.carbon b.oxygen c.hydrogen d.water

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.

What does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients