At the beginning of an experiment a scientist proposes an educated guess about will happen. What is this guess called? Chemistry Introduction Scientific Method 1 Answer anor277 Jun 7, 2018 #"An hypothesis..."# Explanation: To quote a dictionary of philosophy... …#" an hypothesis is a proposition made as a basis"# #"for reasoning, without any assumption of its truth..."# The hypothesis is then tested in an experiment..to determine its validity and scope. A scientific hypothesis is #"falsifiable"#...See here and here. Answer link Related questions How can the scientific method be applied to everyday life? What are some common mistakes students make with the scientific method? What are hypotheses according to the scientific method? What is a theory according to the scientific method? Do scientists have to record all data precisely in order to follow the scientific method? What is the goal of peer review in the scientific method? Why is the scientific method important to follow? How did Tycho Brahe and Kepler employ the scientific method? Do all scientists use the scientific method? Why should scientists provide an abstract for, or summary of their research? See all questions in Scientific Method Impact of this question 2795 views around the world You can reuse this answer Creative Commons License