Which of the following is a sign of a chemical change? * Change in shape
Melting from solid to liquid
Formation of a precipitate
Change in size

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.

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

Asolubility table shows that almost all compounds of group 1 metals are soluble in water. this general rule tells you that mgi2 is soluble rbno3 is soluble cacl2 is soluble co2 is soluble