What are some signs that a chemical change has occurred?

Identify a specific example for each type of technology

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.

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit