11. Which of the following forces is a contact force? *
A. Gravity
B. Friction
C. Magnetism
D. Electricity

Asimply means that over time there was some sort of change.

Apossible explanation for a set of facts that can be tested by further investigation is called

The experiment was repeated many years later but the gases were mixed in a different type of container. a white solid was obtained which was xenon fluoride. predict whether you think 1) krypton and 2) radon will react with fluorine. explain reasons for your predictions