A 15 L sample of a gas is at STP. What is the # of mole of this gas? R= .0821latm/K mol

Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity

What are transitions between a liquid and a solid called? identify which way they are transitioning

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.