A balloon contains 0.76 mol N2, 0.18 mol Ar, 0.031 mol He, and 0.026 mol H2 at 739 mm Hg. What is the partial pressure of Ar

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

The footprints of a dinosaur and the burrow of an ancient shrimp are examples of which kind of fossils