Hydrogen Gas (H₂) A. 2 atoms of oxygen
B. 2 atoms of hydrogen
C. 1 atom of hydrogen
D. 3 atoms of hydrogen

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

In a water molecule, hydrogen and oxygen are held together by a(an) bond. a) double covalent b) ionic c) nonpolar covalent d) hydrogen e) polar covalent

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?