When you change the amount of a substance, the boiling and melting ) go up b) go down c)become the same temp. d) remain the same

Why is nh3 classified as a polar molecule

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.

What is the main reason why some developing countries fear the increase the free trade policies around the world?