Jane knows that sodium in Na and chlorine react together violently. what is one reason the reaction readily occurs

Ablock of mass m slides on a horizontal frictionless table with an initial speed v0 . it then compresses a spring of force constant k and is brought to rest. the acceleration of gravity is 9.8 m/s2 . how much is the spring compressed x from its natural length?

If you held a stone over the mouth of a well and then let it go , what would happen to the stone? explain your answer.

During which step of the scientific method does a scientist make an educated guess about the outcome of an experiment? a. form a hypothesis b. analyze the results c. design an experiment d. collect data