Please help me in Chemistry :)​ 1.) Write 2 points of difference between water molecule and hydrogen molecule.

2.) Differentiate between homogeneous and heterogeneous mixture.
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Which sentence best describes the formation of igneous rock? a- lava on the surface dries up and makes arock b_melted rocks cools and forms crystals c_rocks under tremendous heat and pressure d_magma is melted rock underground

Explain how the integumentary system plays a crucial role in the ability to maintain homeoestasis

Apump contains 0.5 l of air at 203 kpa.you draw back on the piston of the pump, expanding the volume until the pressure reads 50.8 kpa. what is the new volume of the air pump