When a substance is boiled, what happens to the mass?

a. the mass increases as it changes from a liquid to a gas
b. the mass stays constant from a liquid to a solid
c. there is no mass once the substance becomes a gas
d. the mass decreases as it changes from a liquid to a gas

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.

Reduction is a reaction which results in a in electrons and a in positive charge of the atom or ion 1) a- loss 1) b- gain 2) a-increase 2) b-decrease