A change in state is when a solid melts into a liquid (ice melts to for liquid water), or a liquid boils and turns into a gas (boiling water turns into steam). Is the study of energy changes that
happen during chemical reactions and changes in state? *

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

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

What are the two major rules associated with polarity