Is this a pure substance or a mixture? molecular hydrogen 3D molecular oxygen 3D HH molecular oxygen 3D X molecular hydrogen 3DX HH molecular hydrogen 3DX HH Hint: Notice if the elements/compounds are just physically combined or if they are bonded. Pure substance ○ Mixture

hat does temperature measure? Are the molecules in a beaker of warm water moving at the same speed as the molecules in a beaker of cold water? Explain? What is heat? Is heat the same as temperature?

plz explain in simple terms

10. Nitrogen, hydrogen, and ammonia (NH3) are all composed of molecules. What is it about a molecule of ammonia that makes it a compound, whereas hydrogen and nitrogen are elements? A) There are four atoms making up an ammonia molecule. B) The ammonia molecule contains atoms of two different types of elements. C) An ammonia molecule has more than one bond. D) An ammonia molecule has a larger mass than the sum of the masses of its constituent atoms.