Pl
explain

a star appears to be red in the night sky. is the star traveling toward the earth or away from the earth? how do we know this?
5 points for correct direction
5 points for explanation

Which type of reaction always has an element and a compound as reactants

Match the following items. 1. high-intensity bundle of energy being emitted from some decaying nuclei gamma ray 2. particle radiating from the nucleus of some atoms beta particle 3. negative particle identical to an electron but radiating from a decaying nucleus alpha particle

Compare and contrast physical changes with chemical changes.