Giselle is working with a chemical substance in a laboratory. she observes that when the chemical is heated, it gives off a gas. she assumes that the gas is oxygen but decides to test this assumption to verify it. which type of scientific knowledge is giselle’s assumption? a. fact b. hypothesis c. law d. observation e. theory

Which of the following warnings would an agricultural chemist tell a farmer who wants to recycle his or her own ammonia? recycling ammonia is a difficult process that sometimes takes weeks. recycling ammonia requires a degree in biochemistry or a related field. recycling ammonia can be harmful because it is highly flammable and toxic. recycling ammonia costs too much money considering the price of the necessary chemicals.