How many significant figures should be reported in the answer to the following calculation? (43.980) × (19.0023 + 25) =

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of

Which sample at stp has the same number of atoms as 18 liters of ne at stp