The question is incomplete, the complete question is;
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
Answer:
B.
hypothesis
Explanation:
A hypothesis is an intelligent guess put forward to explain an experimental observation. It is a tentative explanation for a scientific observation which must be subjected to careful verification.
Giselle’s assumption that the gas evolved is oxygen is a hypothesis. It must now be tested carefully in order to verify if the hypothesis is true.
