If a substance changes its shape and size, is it a physical or chemical change? - chemical - physical - both

Which type of bonding involves the complete transfer of a valence electron from a less electrogrative atom to a more electronegative one

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.