What step of the scientific method do we record data

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?

Which if the following types of research is conducted on multiple occasions over time

Which of the following best explains what happens when the kinetic energy of particles in a liquid state decreases?