If 15.8 grams of sodium react with excess water, how many liters of hydrogen gas can be produced at 303 kelvin and 1.30 atmospheres? 2 na (s) + 2 h2o  2 naoh (l) + h2 (g)

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Which of the following happens during cell division? (a) energy is created (b) waste is eliminated (c) carbon dioxide is released (d) damaged cells are replaced

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?