Compare: identify three ways that a biologist's research is similar to an astronomer's. both scientists always perform experiments in the lab. both scientists share knowledge with scientists in other fields. both scientists make observations both scientists form and test hypotheses

Which of the following true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are tall mountains. c_earthquakes cause volcanoes in the same location to erupt violently d_volcanoes and earthquakes occur only where plates are colliding with each other

How many moles are in 250 grams of tungsten (w)? * 4.4x10^23 moles 4.2x10^23 moles 0.7 moles 1.4 moles

How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?