Caclium carbonate +sodium bicarbonate -carbon dioxide+calcium carbonate+sodium chloride+dihydrogen monoxide what kind of reaction is this? is it balanced

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.

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

Acontrol during an experiment. might change remains constant does not exist does change