Which of the following could indicate that a chemical change has taken place? gas formation formation of a precipitate color change all of the above

Which of the following are sources of revenue for media companies? a. direct sales to producers b. advertising and subscriptions c. online purchase d. capital investments

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound

Atoms contain subatomic particles called protons and neutrons. when these protons and neutrons spilt, a lot of energy is released