Which statement describes the energy changes that occur when water in a kettle is heated on a stove that uses natural gas ?

Is this a single replacement reaction or there is no

List four observations that indicate that a chemical reaction may be taking place

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.